Sealed Evil in a Can



""Old folk saying: 'You can catch the devil, but you can't hold him long.'""

- Rod Serling, from The Twilight Zone episode "The Howling Man"

Long ago, An Ancient People faced a terrible evil. Using various methods, they bound the evil into a prison from which they thought it could never escape.

It did.

Sealed Evil In A Can, as the title suggests, is a way to introduce a villain suddenly, especially one that is legendary and powerful. It also explains why the villain hasn't done anything up to that point: It just now escaped.

Sometimes, the Big Bad's plan is to unseal the can of some ancient God of Evil; hoping they'll get some of that great power as a reward. If they succeed, it almost always turns out that the Sealed Evil was manipulating them into freeing them, making the Sealed Evil the true Big Bad. Sealed Evil™ almost never rewards those who release it. It may act like the malevolent flavor of a Literal Genie, twisting their releasers' wishes back on them, or it may simply decide that You Have Outlived Your Usefulness. Remember: Evil Is Not a Toy.

The primary question is usually "Why did they just seal it, as opposed to KILL it?" Well, the answer tends to vary; but usually it's a variant of The Punishment (for both the sealed and everyone else), and/or As Long as There Is Evil. Maybe it can't die (or more commonly, the conditions weren't right to deal the final blow), so sealing is the next best thing. Another common excuse is the Balance Between Good and Evil; if they'd killed the ancient evil, then a bigger, badder evil would've taken its place, thus sealing it away neutralizes the threat but also keeps it in the world and maintains the balance. For some reason, only on a very few occasions were the goods not strong enough at the time.

Expect the mere release of the SEIAC to cause a World-Wrecking Wave, Walking Wasteland, and sundry other disasters. That said, being cooped up for centuries is likely to have weakened the SEIAC, meaning it needs some time to recover its lost strength.

Since this trope can be traced back to Greek mythology, it's Older Than Feudalism. Notice that it is exactly the same, without the mystical magical mumbo-jumbo, as any plot where a horrible criminal escapes from or is released from prison.

Polar opposite of Sealed Good in a Can. Sealed Badass in a Can is a neutral variant. See Sealed Inside a Person Shaped Can when the evil is imprisoned inside a living being, Sealed Evil in a Teddy Bear when said person shaped can is The Team Pet, Sealed Army in a Can when the makers were low on cash and had to make do with a single can for multiple Evils, and Sealed Evil in a Six Pack when it's sealed within multiple things. Sometimes requires Sealed Evil in a Duel. Compare Tailor-Made Prison, when the current generation makes its own can to (temporarily) imprison evildoers. Compare Pointless Doomsday Device. For cases where a particularly powerful Sealed Evil overshadows a setting but never manages to affect the plot directly enough to be a Big Bad, see Bigger Bad.

Anime & Manga

 * Ryoko, from Tenchi Muyo!!, was sealed away as a traditional demon in the OVAs; however, after calming down by dueling Tenchi for an episode, she joined the cast as a protagonist and suitor for Tenchi's hand. Washuu was in a similar situation in the TV series.
 * In Yu-Gi-Oh!!, Pharaoh Atem took the contingency plan of sealing both the Big Bad and himself 3000 years ago, until both resurfaced roughly simultaneously when their respective containers were found by archaeologists.
 * Despite his good intentions, his less than polite hosting methods and outdated ideas of justice made Atem himself a close case of Sealed Evil In A Can in the early manga until Yugi got hold of The Leash.
 * In Magical Girl Lyrical Nanoha A's, the Book of Darkness regenerates every ten years, sealing its programs (the Wolkenritter) inside of itself until then. Also,
 * In One Piece, Impel Down, the world's most secure prison has a level that most people don't even know exists, Level 6 the "Eternal Hell" which contains at least two ex-Warlords of the Sea,  & Shiliew, the insane ex-Head Jailer who was a match even for Warden Magellan.
 * , but.
 * Poor mermaids.
 * The Panthalassa and the real Michel in Mermaid Melody Pichi Pichi Pitch.
 * In Dragon Ball, the original Big Bad, Emperor Pilaf, uncorks Piccolo Daimao ("Piccolo, King Of The Demons"), the Sealed Evil In A Can who had previously been trapped in a Denshi Jar by Mutaito-sama centuries before the start of the series. (The Denshi Jar gets bonus points for strangeness; it is, in fact, an electric rice cooker with a holy seal glued to it.) Piccolo is revealed to be basically a Gnostic version of Satan, being the pure evil that the current God expelled to get "pure" enough to get his position in the first place (oh, and God is a Sufficiently Advanced Alien). The trope is somewhat subverted, however, in that, one Cloning Blues and one Heel Face Turn later, Piccolo joins the good guys.
 * Later, in Dragonball Z, the five-million-year-old sorcerer Babidi comes to Earth seeking energy to power Buu, the Sealed Evil In A Can that ate God's superiors. Originally, Toriyama wanted to finish the series after the defeat of Frieza, the ruler of the galaxy and the most powerful being in the universe. When the series' success made this impossible, he was forced to invent ever more implausible reasons why the ever more powerful villains hadn't shown up before and kicked Frieza's rear end. Androids, super-clones made from our heroes' DNA... by the time Babidi came to Earth, the current villain (Dabura) was the evil God of a Bizarro Universe. When he couldn't top that, Toriyama simply pulled Buu out of a Can.
 * Toriyama acknowledges his reliance on the Sealed Evil In A Can formula in the Neko Majin Z parody comic, in which the titular "hero" keeps a powerful demon sealed in a small rock balanced on top of a boulder by the side of a road. If anyone picks up the rock, the demon is released, requiring Neko Majin to step in and re-seal the demon... for a fee.
 * In the 13th movie, Wrath of the Dragon, the monster Hirudegarn is split in two and sealed inside Tapion and Minosha. Hoi breaks him free and rejoins the two halves...
 * In the 9th movie, Bojack Unbound, the Galaxy Soldier, Bojack was sealed inside a star by the four Kais who would remain there. But due to North Kai's death by Goku's sacrifice with ready-to-explode Cell, Bojack was freed from imprisonment and heads towards Earth where Cell fought.
 * The Decepticon army that Crosswise was jailer of in Transformers: Cybertron, until Starscream freed them.
 * The Slayers has Ruby-Eye Shabranigdo, which was broken into seven pieces and sealed in humans (and gets out every now and then), Zanafar, and for good measure Shabranigdo's lieutenant Chaos Dragon Gaav.
 * In Princess Tutu the evil raven was sealed away by a prince who broke his heart into shards; the raven gradually gains power through the series and is fully freed when the prince's heart is returned to him.
 * After "Him" in Powerpuff Girls Z is defeated horribly by a bunch of girls, he is contained in a tomb in an abandoned museum until the present day at which point he sends out a mummy to find the means to release him from his prison. His main goal is to conquer the world and destroy the Powerpuff Girls for their resemblance to the Ōedo Chakichaki Musume, the first three to defeat him.
 * The title character of Inuyasha is a half-demon who was sealed to a tree by the priestess Kikyo's arrow for 50 years, until Kikyo's reincarnation Kagome freed him out of necessity. Of course, his apparent "evilness" didn't last long.
 * The seal is played straight with Ryuukossei, however. The powerful youkai that killed Inuyasha's father is first mentioned only when it becomes necessary for Inuyasha to succeed in an achievement that surpasses his father so he can master his sword. Cue introduction of Ryuukossei who had never been mentioned prior to that point. Reason being that Inuyasha's father managed to seal Ryuukossei with a fang the way Kikyou had sealed Inuyasha with an arrow. Naraku frees Ryuukossei who fights Inuyasha and dies, allowing Inuyasha to surpass his father and master his sword.
 * Also from Inuyasha, the . Unique in that it is both Sealed Evil In A Can and Sealed Good in a Can..
 * Inuyasha also features an anime-only example where the cast actually tries to seal away something evil to create this trope. When Toukijin's creator is killed as a result of the sword possessing him, the sword lands in the middle of a field. Even Ultimate Blacksmith Toutousai is unable to approach its immensely powerful evil aura, leaving them at a loss what to do. In the manga, this is the moment where Sesshoumaru (who comissioned the creation of the sword) arrives, defeating and mastering the sword as soon as he touches it. In an Adaptation Expansion, the anime, has the blade begin to corrupt the ground around it as soon as it lands, spreading swiftly. Since none of them can approach it, they debate what to do and Miroku decides to build a small shrine around the sword, blessing it to keep Toukijin's evil from spreading. Only then does the anime allow Sesshomaru to arrive to defeat and master the sword.
 * In the third movie, the evil sword Sou'unga was also sealed away for a few hundred years, only to break the seal while in Kagome's time and go about trying to kill everyone.
 * The anime version of Prétear starts with the villain breaking free after sixteen years of being sealed away.
 * And in the manga version, she remains sealed--but still manages to possess others anyway.
 * Most of the villains in Sailor Moon were sealed until recently, except for the last season. In the first season, inside the can (the Dark Kingdom/Negaverse) was another can, with another, bigger Sealed Evil (Metallia/Negaforce) inside it; the forces of the Dark Kingdom spent most of their time draining energy from people in order to charge the metaphorical can opener needed to release her.
 * In the last season (in the anime at least), it is revealed that
 * In the Gonzo version of Hellsing, the final episode reveals that Incognito plans to  destroy the world. Of course,.
 * Hell. What about Alucard himself? He used to be in a state of hibernation as a dead, rotting husk in a basement. And then someone found a way to splatter him with blood of all things...
 * In Soul Eater, the Sealed Evil in a Can is the Kishin, an insane creature who, basically, wreaked havoc upon the world until being sealed. The people working for the Shinigami do so to prevent the creation of another Kishin, which would occur if someone consumed a large number of human souls. It is not until half-way through the series that the main characters discover that the "original" Kishin is still alive, and imprisoned underneath their city.
 * In a bag made out of his own skin. Ew.
 * Not only does said Evil get out but the manga later reveals that there are similar creatures trapped elsewhere, although the Great Old One in Eibon's book has more in common with Shinigami than their estranged comrade Asura.
 * In Deadman Wonderland the "evil" are people affected by the "Branch of Sin" who are secretly hidden deep in the "can", a maximum security prison/publicly open amusement park
 * Mahou Sensei Negima features two examples, one completely straight and the other a little bizarre. First, as the straight example we have Ryomen Sukuna no Kami, a gigantic four-armed two-faced demon god sealed in the Kansai region of Japan; releasing and controlling him was the motivation for the villains of the Kyoto arc. Second, and rather more unusual, we have the ancient and legendary vampire sorceress Evangeline A.K. McDowell. While she was a wanted magical criminal, responsible for multiple heinous crimes and with a huge bounty on her head, her sealing was based less on her evil and more on her obsession with the main character's father. And, once you get to know her, she's not really as evil as she liked to claim... to the point that when the aforementioned demon god is released, the protagonists defeat it by breaking the seal on Evangeline and letting her deal with it.
 * Played straight again with who is sealed
 * Hell Teacher Nube has a demon who tried to kill him in his childhood sealed into his left hand by his mentor Minako.
 * The three big bad Tayutai in Tayutama are strong, but their method of sealing might have needed to be reinforced. They were freed by, of all things, a runaway moped. On the other hand, it let Mashiro out into the world, so it all balances out.
 * The plot of My Balls has been summed up as "sealed evil in a man-can." Naturally, sex will let it out, and there are just so many temptations . ..
 * In Umineko no Naku Koro ni, Beatrice; The Golden Witch, The Endless Witch, The Witch Who Has Lived For A Thousand Years; is set up as this. . Note that according to her the can she was sealed in was originally meant to seal something else.
 * The character Isaac from Eternal Sabbath was sealed in a glass tank for several years before breaking free and wreaking havoc using his charm and charisma.
 * In the third part of JoJo's Bizarre Adventure, legendary antagonist Dio Brando is released from imprisonment in a casket at the bottom of the sea by some unwitting salvagers, where he'd spent the last 100 years since the end of part one.
 * In Kamichama Karin, the Big Bad sealed himself inside the ring of Zeus.
 * In Bleach,
 * Tailed Beasts in Naruto are generally Sealed Inside a Person Shaped Can because it lets people use their power, there are a couple cases where they've been sealed inside objects: Shukaku was said to have been sealed in a teapot, the 8-tails was sealed in a giant jar (which can seal people in it as well), and
 * In Digimon Frontier, Lucemon was sealed away in the Digital World's core.
 * of Fairy Tail is revealed to be this right after someone wastes their life trying to raise him from the dead.
 * Even worse, the guy who wasted his life was just a diversion while someone else got the keys to unseal
 * In "Utawarerumono", Hakuoro finally has his Crowning Moment of Awesome and has the Big Bad Sealed In A Can.
 * Soushu from Kyou Kara Maou is Sealed Evil in four Boxes.
 * Liselotte Werckmeister in Eleven Eyes was sealed by the Black Knights in a Crystal as she is an immortal and intends to destroy the world. Though in the finale of the story, the seal is undone. In the anime only ending, once again she is sealed away to a spacetime rift with Kakeru and the black knights combine effort. In the original game novel, Kakeru manage to finally kill her off for good by destoying the Voidstone within Liselotte using the Eye of Aeon.
 * Poseidon from Saint Seiya, sealed in a jar.
 * Mag Mel and Razenoid started the fourth season of Bakugan as this. Credit must be given to for being extremely thorough though. He was sealed inside armor crafted from his own evil, then imprisoned in an alternate universe, and tied to his own throne with powerful webbing. The only reason he was able to free himself was simply because he had a Psychic Link to Dan and Drago, allowing himself to become powerful enough to free himself, something the one who put him there wasn't aware of.
 * The ghosts of Ghost Stories, until the construction sites destroy the places where they had been imprisoned. Satsuki then has to spend the rest of the series re-sealing them.

Card Games

 * Magic the Gathering has a card called Dark Depths, which, after certain conditions are met, i.e. the costly "unsealing" process of removing ten ice counters from it, creates a large and damn near unkillable monster.
 * For a much older example, consider the Bottle of Suleiman, which upon being sacrificed has a 50/50 chance of either releasing a fairly powerful djinn that joins your forces or else simply blowing up in your face.
 * And then there's the Tomb of Urami, who nets you a big demon at the price of sacrificing all of your lands.
 * Yawgmoth, the guy who makes planeswalkers look like muggles and Dominaria's version of the Devil, was sealed in a whole other plane back when he was a mortal. He wanted back in, of course, and spent thousands of years in a battle of wits with Anti-Hero Urza with his freedom as the stakes.
 * In the Zendikar expansion a group of Eldritch Abominations called the Eldrazi were got sealed away by Sorin Markov and two other guys, turning all of Zendikar into a prison for them. The final set in the Zendikar block, Rise of the Eldrazi, sees them loosed on the Multiverse.
 * A plot-relevant example can be found in the Innistrad expansion: The Helvault was created by the archangel Avacyn to seal away demons that she couldn't outright defeat. The plot of the expansion is set in motion when, by twist of fate, Avacyn herself becomes sealed inside the Helvault.
 * Yu-Gi-Oh!! has several monsters like this, the most memorable being Exodia (who is split up into five pieces and allows you to win the game should you have all five in your hand; in the anime, it did take a huge ritual to unseal it) and all versions of the three God Cards (Egyptian, Sacred Beasts, and "Wicked Gods", all of which need three sacrifices to bring out and have devastating power, and two of which have fusions of themselves that are even more powerful). In the anime, they are so powerful that most of them are sealed up themselves, and it's considered madness for anyone to try and duel with them in their deck.

Comics

 * In The DCU, the Phantom Zone is essentially an other-dimensional prison that holds numerous Kryptonian criminals. As such, there many stories where the prisoners escape and the heroes have to fight to throw them back into the Zone.
 * In Hsu and Chan, the Tanaka brothers fight off a demon invasion by sealing them in various trinkets and keepsakes.
 * In Johnny the Homicidal Maniac, Johnny's constant murders are (partially) motivated by the need for fresh blood to paint on one of the walls in his house, which keeps the monster trapped behind it from physically getting out.
 * In Lucifer, the seraph Meleos long ago created the Basanos, a living, extremely powerful living tarot deck as both a complement to Destiny's book (which contains nearly everything that will ever happen) and a means of recording and preserving humanity's thoughts. The latter function, however, corrupted the Basanos and turned them into beings of pure evil, so Meleos has since locked them in a box. However,
 * In The Astounding Wolf Man  is an ancient and evil golem that was imprisoned under Stonehenge. As soon as he is released by   he goes to kill the blood relatives of those who imprisoned him.
 * The Lord of Locusts from Bone.
 * Ragamuffin, from Lenore the Cute Little Dead Girl, the eternal vampire scourge who eats people alive, is trapped in a rag doll for the most part of the comics.
 * Green Lantern: Rebirth revealed that the long-established "yellow impurity" in the Central Power Battery was actually Parallax, the "yellow fear entity," an insectile manifestation of that emotion, released when Hal "Greatest GL of them All" Jordan entered the Central Battery years before.
 * Justice League of America comics occasionally feature early JLA enemies the Demons Three (Abnegazar, Ghast, and Rath), evil beings who ruled the Earth a billion years ago until being imprisoned in crypts by mysterious powerful entities called the Timeless Ones. The three Demons were eventually summoned/released in the present by Felix Faust, with occasional other escapes from imprisonment since then.
 * Parodied in a 1983 nine-page story in Love and Rockets by Jamie Hernandez called Maggie vs Maniakk. Maggie plays with a "Mayamese mini transporter" and accidentally frees Maniakk, a costumed super evil trapped in limbo/the ninth dimension by Ultimax, a superhero now down on his luck.
 * In "The Garden" segment of Garfield: His 9 Lives, Garfield (who is a kitten here) and Cloey (his owner in this life) are given a magical garden by Uncle Tod when he joins the circus, under the condition that they never open the crystal box on the checkered toadstool. The trope is subverted here because, out of loyalty to Uncle Tod, they decide not to open it.
 * Fables' second Big Bad came out of his can due to the effects of the heroes saving the world.
 * Also, the djinn that Frau Totenkinder dealt with earlier, although that was more of a case of amoral and incredibly dangerous and destructive, especially in the hands of an evil man, but not evil in and of itself.
 * Lampshaded in the short-lived comic BMG, where the Big Bad literally releases The Dragon from a can labeled "Instant evil. Just add water."
 * One episode of The Sandman had an Arabian Nights-flavored tale with a medieval caliph (kind of like a Muslim king/pope) who wanted to talk to Dream. The caliph went into a dark secret room and took out an ancient globe full of demons, threatening to break it and release them all. Morpheus appeared, took the globe and pocketed it, and then inquired what the caliph wanted.
 * One of the main foes of Hellboy is the Ogdru Jahad, an Eldritch Abomination on par with Cthulhu and the boys.
 * Superman. Doomsday was living Sealed Evil, but ultimately broke out of his own can. He keeps getting re-sealed in stronger cans (we hope!). The DVD movie cartoon "Superman: Doomsday" is a more literal version of this trope, as Doomsday was accidentally by Lexcorp.
 * In Marvel comics, Galactus acts as a can on a greater, multiverse-destroying evil. Most of the energy he gets from his food goes to maintaining the seal, explaining his unusual diet.
 * The Warlock Graveyard in I Hunt Monsters is this, housing many powerful monsters in it and kept in check by an obelisk that needs to be recharged every century of so. It the protagonist's disbelief and reluctance that ends up freeing the monsters and he forced to track them down and re-seal them.
 * Caged Demonwolf (Molestor of Worlds!) from Empowered is an Eldritch Abomination that Emp trapped into an alien-made power-draining bondage gear. It Makes Sense in Context.
 * Jurid from Thieves and Kings, also known as "the Dawn Swallower", is a powerful monster, but spent a thousand years or so stuck in a glass bottle, trapped by a young girl.
 * Zom, from Doctor Strange - a surprisingly obscure hyperdemon who was this trope almost literally, having been sealed in a special amphora in another dimension. Horrifically powerful. He was initially imprisoned by a coalition of cosmic beings, including Eternity and frickin' Dormammu, and when he was let out, he frightened Umar (Dormammu's even scarier sister) so much she ran home and said she'd never come out again. Considering how bad-ass he is, the "can", or amphora, must truly be the can of the gods.
 * Then came World War Hulk, when a desperate Strange let Zom back out of the bottle -- and quickly discovered that Evil Is Not a Toy.
 * In the comic strip Wormy, the titular dragon owned a collection of magical orbs containing vicious demons, which a human wizard attempted to steal. This being a humor comic, Wormy used the orbs as snooker balls.
 * The Source Wall in The DCU is a huge cosmic barrier between the Source (the source of power behind existence itself) and the rest of creation. The Wall is decorated with the bodies and visages of all of the would be conquerors who have sought to claim the power of the Source for themselves, imprisoning them for all eternity. The Wall is one of the more effective Cans in fiction and only three people have ever escaped it. One of them, Yuga Khan (the father of Darkseid), managed to summon just enough power to free himself from the Wall...only to get himself imprisoned in it again in another bid to obtain the Source, this time for good. The second one was Darkseid himself, and he needed the help of the one who imprisoned him in the first place (Superman) to do it. The third was Superman, who was trapped by Darkseid and required the help of every variation of Supergirl from the last twenty years to break free.
 * In the conclusion of The Thanos Imperative event,
 * In a Disney Afternoon crossover event in Disney Adventures, the Chaos God himself, Solego, was trapped in two pieces: a crystal held his mind and a gold medallion held his powers. Uniting the pieces released him and that isn't a good thing.
 * Tiamut the Dreaming Celestial was exiled to Earth by his Celestial brethren for committing a crime against "life itself".
 * The french comic book Les Legendaires introduces the Evil God Anathos, whose essence was trapped a long time ago by the other gods in a living prison called the Bearer. While his origin is a typical use of the trope, the way he comes back is partially subverted, as he frees himself by taking control of the Bearer and using Demonic Possession, as well as manipulating one of the protagonists rather than another villain; the original Big Bad, Darkhell, actually attempted to prevent his return rather than helping him.
 * The Sohrem of Nightschool.

Fan Fiction

 * In Fuck the Jesus Beam, BaROCK Dominatus Caesar Inferno Vespucci Giovanni Goku Super Sexy Awesome Absolute GOD O.B.A.M.A., officially known as the greatest evil the world has ever known, is a Kenyan terrorist who was president for 14,657 consecutive terms and started 95 world wars who has been sealed away for 100 million years. Niamy releases him to deal with the Bombignats and Fetii, only for him to take control of them.
 * Daemon from the Tamers Forever Series, who breaks himself out.
 * The Touhou fanfiction Imperfect Metamorphosis has both and, who were sealed in the different ways and for different reasons, although while they're both thought of as evil only one of them actually is. The characters involved in the sealings also spend a lot of time justifying them, which ultimately boils down to the two being too damn tough to kill and requiring a different method.

Film - Animated

 * The Titans in Disney's Hercules film. Zeus imprisons them all beneath the ocean with lightning bolts, but when the planets align, Hades is able to release them.
 * Jafar in Disney's Aladdin and (of course) The Return of Jafar.
 * The villain Hexxus in Fern Gully, who for ages was sealed into a tree, and was released when the tree was cut down.

Film - Live Action

 * Superman and Superman II both feature the Phantom Zone, but make it out to be a one-time prison for a specific set of three villains.
 * In the movie The Ruins, as well as in the book, the protagonists are attacked by . In the end of The Movie,, and in one alternate ending,
 * Wishmaster is this trope. A powerful djinn sealed inside a fire opal since biblical times is awakened by the heroine who accidentally broke it. The monster will wreak havoc on earth as soon as the girl ask her proverbial 3 wishes. But she wont, 'cause that would be wrong. And so on.
 * John Carpenter's Prince of Darkness literally had Sealed Evil in a Can -- Satan, in fact, sealed in a giant glass and metal container in the basement of a church. Of course, he manages to escape.
 * And then there's The Thing, sealed in a block of ice until some ill-advised Norwegians dig it out.
 * Most Egregious Example of All Time: In the 1999 version of The Mummy, it is the very act of Sealing Imhotep in a Can that bestows the apocalyptic abilities that he displays in the movie. Moral: Never Punish Your Enemy in a Way That Will Grant Him More Power.
 * 2001's sequel, The Mummy Returns, opens up another can of evil in the form of The Rock's CGI-animated appearance as The Scorpion King -- which in turn opened the door for one of those prequels mentioned in the main text.
 * Averted in the third Mummy movie, when the already incredibly powerful Chinese Emperor didn't gain anything from the curse that transformed him into a crumbling clay figure. In fact, if it wasn't even the curse that revived him, but some miracle water. As a side effect, though, he has the ability to throw his face at people. He used it.
 * The Van Helsing movie has Dracula sealed inside his own part of the world, but circumventing it by developing wings, which he passed on to his other kin.
 * In the 2007 Transformers movie,
 * Prequel comics for the third film reveal Shockwave to be this; he was found by the USSR decades ago. And, of course, there's, who's.
 * The comic books as well as the movie adaption of Hellboy feature several such sealed-away monstrosities. In the movie, one demon was literally sealed in a consecrated urn, and of course the Ogdru Jahad, the Lovecraftian chaos gods of the Hellboy universe, lie imprisoned and waiting in the Void beyond the stars.
 * In the first Ghostbusters movie, the Ghostbusters seal all of their captured ghosts in a large containment unit that can only stay locked through the help of a power grid. When they capture an individual ghost, they suck it into a smaller container.
 * In Clive Barker's Hellraiser, the Cenobites will not come after you unless you solve the puzzle of the Lament Configuration.
 * In Gremlins 2: The New Batch, Billy traps the Electric Gremlin in the Clamp Corp. phone system, where the villain suffers the torture of being on-hold.
 * In Mighty Morphin Power Rangers: The Movie, the shapeshifting Ivan Ooze had been trapped underground for 6,000 years until his containment chamber was accidentally unearthed by a construction crew and later opened by Lord Zedd.
 * In Turbo: A Power Rangers Movie, Maligore is freed from a volcano on an island that is sealed in another dimension.
 * The titular monster of  The Beast from 20,000 Fathoms, while more predatory and aggressive than actually evil, is certainly an example of this. The rhedosaurus was frozen in Arctic ice since the early Cretaceous, and is thawed out by nuclear testing. Somehow, it is still alive.
 * Time Bandits: "Don't touch it -- it's concentrated evil!"
 * Also, Evil himself is unable to leave his fortress.
 * Played with in the film adaptation of The Shadow. A museum receives a silver sarcophagus from a mysterious source, with an inscription on it saying it's the coffin of Genghis Khan. When the security guard is left alone with it the coffin starts to shake around and eventually opens up to reveal a man in the dress of a Mongol warrior, who telepathically forces the security guard to shoot himself. However, it turns out it's not actually Genghis Khan, but a modern-day descendant.
 * Living Hell, a recent horror movie has sublevel 4, vault 12, on a military base, which the protagonist doesn't want disturbed. Of course, the military had completely missed the hidden door in the vault 'til the protagonist waltzed in and told them there was something there... and we all know what to do with hidden doors, right? So, nice job there, hero.
 * Played with and subverted in Kung Fu Hustle. The Beast is locked up in an insane asylum -- but only because he was bored from the lack of worthy opponents to duel and so checked himself in. When Sing is snuck in by the Axe Gang to break out the Beast for recruitment and picks his cell door open, the audience sees the Beast as a bald old man with a pair of spectacles in wifebeaters and boxers sitting on the john reading a newspaper. Which makes the Beast Sealed Evil On the Can.
 * The crew of the Enterprise almost let Evil out of its can in Star Trek V. "What does God need with a starship?"
 * The Blob has the heroes create a sealed evil in a can out of the titular menace by freezing the monster and transporting it to the north pole. And now we have Global Warming...
 * The sequel Beware The Blob plays the trope much more literally: a oil worker brings home a frozen chunk of the Blob, sealed in a thermos. But not sealed too tightly, of course, or else we wouldn't have a movie.
 * Another candidate for Most Egregious Example of All Time is the movie Hobgoblins, where a group of mischievous, killer, evil, mind-controlling, rapidly-nodding hobgoblin puppets are "sealed" inside a large, vault door, behind a barred gate, neither of which are, you know... locked. Worse yet, the man who's spent thirty years "guarding" these "sealed" horrors is a demolitions expert and always was. Too bad that didn't occur to him, you know... sometime during the last thirty years?
 * In The Mighty Boosh Live, the Hitcher and his minions are introduced into the show when a box is opened. The Hitcher was apparently sealed in the box for 200 years, for crimes against humanity.
 * Including, but limited to raping a dolphin and driving contaminated swans to fights.
 * Used literally in Return of the Living Dead, where a brain-eating zombie and corpse-animating 245-Trioxin gas are accidentally released from a sealed metal cannister.
 * The Thief of Bagdad, directed by Alexander Korda, provides a classic example, lifted from the old Arabian Nights tale, "The Fisherman and the Bottle"; Abu the thief, stranded on an island by Jaffar, finds an old glass bottle and uncorks it, releasing a huge genie, who had vowed long ago to kill whoever released him from the bottle. Abu tricks the genie back into the bottle, prompting the genie to offer the prerequisite three wishes. Of course he turns out to be a bit of a Literal Genie.
 * In the Mother of Tears, Mater Lachrymarum's powers are restored by the unearthing of a lost talisman, making it more a case of "Sealed Evil Artifact In A Can." Lachrymarum herself was apparently in some sort of self-imposed hibernation prior to this.
 * In Jumanji, the titular board game is buried underground for decades until it is unearthed by a construction team and found by Alan. "What if someone digs it up?" "Then may God have mercy on his soul."
 * Rare Exports: In prehistoric times the Sami-folk of Lapland, tired of the tyranny of Santa Claus, lured him on weak ice, and he sank to the bottom of the lake, which subsequently froze through. He was cut out and covered with tons of sawdust to keep him from melting, and then layers upon layers of dirt and stones over the centuries, until the Korvatunturi mountain on the border of modern Finland and Russia was formed. And this Christmas an obsessed American millionaire decides to dig him out. He is not happy.
 * Beetlejuice. The title ghostly con artist is trapped in the afterlife. He can be temporarily brought back to the real world (and returned) by saying his name three times, but can only be truly free if he marries a human female.
 * The Keep: An ancient monster has been trapped in a castle for centuries, until some Nazis awaken it.
 * Quatermass and The Pit has an ancient alien evil buried under London for millions of years, finally unearthed by building works.
 * Uwe Boll's Alone in The Dark has this, though watching the movie it can be hard to tell exactly what it is. The movie talks about a dark world that mirrors our light world, but at other times, it suggests that the Abcane tribe that discovered them ARE the evil in the can. But then, it's Uwe Boll, so...
 * Maxim Horvath in The Sorcerer's Apprentice.

Gamebooks

 * A ridiculous number of these show up as non-Darklord threats to harass poor Lone Wolf. In a slight subversion, one of these sealed evils, is already dead. Not sealed alive in a prison somewhere, but dead. The goal of two of the books in the series  is to prevent him from coming back.
 * Lord Zahda in Castle Death is another interesting example: he's definitely a powerful evil who had been sealed away, but not so much in a can as in a castle on an island which he ruled over, where he had subjects of his own. So a much larger, more comfortable can, at least.
 * Of course, at the end of book 3, The Caverns of Kalte, you are the one doing the sealing, when you exile Vonotar the Traitor to the Daziarn Plane by pushing him through a shadow gate. Of course, the Daziarn is a whole dimension of its own, not really a can, and, of course, you would eventually see Vonotar again.
 * The Deathlord of Ixia was a more conventional example, since he really was sealed in the proverbial can, and then escaped.
 * Agarash the Damned, Naar's most powerful champion of evil, was sealed in another dimension by the Elder Magi millenia ago. In the Grey Star books he is the Bigger Bad goading the Big Bad Shasarak into freeing him. Grey Star of course has to prevent this.

Literature
"This exchange contains almost all you need to know about human civilization. At least, those bits of it that are not under the sea, fenced off or still smoking."
 * 19th century example: The 1842 German novella Die schwarze Spinne (The Black Spider) by Jeremias Gotthelf: heavily steeped in Christian-conservative symbolism, the story, based on folktales, contrasts pastoral life with satanic influences. The titular black spider (a metaphor for the Black Plague) is created when a ruthless knight baron forces the peasants of a remote valley in the Alps to work themselves nearly to death. The devil in the form of a wild huntsman offers the desperate peasants his help, in exchange for a yet unborn unchristened child. The only person who is willing to strike such a pact is a farmer's wife (and originally a foreigner, adding a touch of xenophobia). The devil kisses her cheek; from this kiss grows an evil tumor in the form of a black spider. Twice, when the devil comes to collect a newborn, the local priest baptizes the child in the nick of time, but as punishment, the monstrous spider, now adult, births thousands of tiny spiders that start killing livestock and people, and finally breaks free from the face of the farmer's wife (who dies) and kills the priest and baby. The spider is finally sealed away when a brave mother, to protect her own newborn, grabs it and, dying, imprisons it in a hole in a wooden beam of her house, into which she hammers a peg to seal away the spider forever. Generations later, when people have stopped believing in the tale and become "sinful", a bragging servant pulls out the peg on a drunken bet and releases the devil spider, until it can again be sealed away by a pious woman who remembers the old tales and sacrifices her life for her child.
 * One of MR James’s favorite tropes was having an unpleasant being imprisoned in a tomb, grave, or ruin, inevitably later disturbed. Stories in this pattern include "Count Magnus" (the count's sarcophagus has three padlocks on it), "An Episode of Cathedral History", and "The Rose Garden".
 * The Damned, from Hells Children, by Andrew Boland, are sealed evil in a can, who spend the entire book trying to get out.
 * Cthulhu. Indeed, most Cosmic Horror uses a can of some sort to explain why the super-powerful beings haven't already destroyed humanity. In this case, however, nobody appears to have done the actual sealing or unsealing; the elder gods are just "sleeping", and will awaken "when the stars are right".
 * Let's not forget that he almost gets out in Call of Cthulhu, only to be run down by a steamship stuffed back in the can.
 * However, the Great Old Ones are not evil per se (save perhaps Nyarlathotep, and he is not always classed as one, and is properly an Outer God, ) but uncaring - they are simply far too powerful for us to matter to them, rather like a human stepping on ants (or for a better example, but purely Scots, the midge) and/or simply mindless - Azathoth for example, could (and apparently will) destroy everytihng, but he is blind, deaf, mute and completely unintelligent,and is no more evil than a hurricane.
 * Another example in Lovecraft's work is The Haunter of the Dark, an avatar of the god Nyarlatotep who is sealed inside the shining trapezohedron and can be summoned by gazing into it. Unlike the Great Old Ones, summoning him doesn't result in the end of the world, but he most likely wants some human sacrifices in exchange for secret knowledge or wants to possess you in order to get mankind to blow itself up.
 * Jadis the White Witch in The Magician's Nephew put herself into suspended animation after destroying her world, and left a way for any visitors to wake her up, so that they’d take her to a new world.
 * The Silmarillion ends with the sealing of Evil Overlord Morgoth in the void beyond the boundaries of the world. He never escapes, though it is implied that Sauron was trying to find some way to release him during the Second Age.
 * Tolkien's Unfinished Talesof Numenor and Middleearth mentions a battle called Dagor Dagorath (the Battle of Battles) that will take place at the end of time, in which Morgoth will be set free and finally be defeated by Túrin Turambar.
 * From The Lord of the Rings, the Balrog of Moria, which was unleashed when the Dwarves Dug Too Deep.
 * The One Ring itself is Sealed Evil In A Can, as it has Sauron's ill will forged within it.
 * Larry Niven's Known Space story World of Ptavvs has a scientific team releasing a Slaver, an ancient alien with large-scale mind control powers and an intense attitude problem, from the stasis field it has been trapped in for a billion years.
 * Fred Saberhagen's Empire of the East did this in an interesting way: the Demon-Prince Orcus, who founded the titular Empire, was imprisoned under the earth by his own lieutenants, John Ominor and Wood, in a coup. Eventually, Wood convinces Ominor that they should release Orcus, believing that only Orcus has the power to match Ardneh, and believing that they can keep Orcus controlled.
 * The blade Stormbringer in the Elric saga by Michael Moorcock straddles the border between this and Evil Weapon as it is both the form of an Eldritch Abomination that it takes on the mortal plane, and is the trap it is bound into. At the end of the saga,
 * Christopher Moore is a big fan of this trope, most notably in Practical Demonkeeping (Catch, the titular demon, is actually sealed away in a jar), Lamb  and You Suck.
 * Colin Wilson's The Space Vampires has a space mission to find a derelict ship drifting in the solar system. The astronauts board it and retrieve what they believe to be several human-like alien bodies. It turns out they're possessed by evil energy beings that live off the life energies of others. The very pulpy movie adaptation (called Lifeforce) has a similar initial situation, though it diverges pretty massively after that (the aliens ).
 * In The Chronicles of Thomas Covenant, the Creator sealed his Evil Counterpart Lord Foul the Despiser in The Land in order to keep the rest of the universe safe. Unfortunately, the Creator didn't really think it through very well, as Lord Foul can now wreak havoc within The Land freely, and if the Creator tries to interfere directly, it'll let Lord Foul out and destroy the Arch of Time (basically, the universe).
 * F. Paul Wilson's The Keep has Radu Molasar, advance man for The Otherness, sealed in a castle in Romania until Those Wacky Nazis let him out.
 * In Who Censored Roger Rabbit? (Literature), it turns out that the titular murderer is
 * The initial premise of The Riftwar Cycle is that the God of Evil was imprisoned by the other surviving gods, but is now reaching out to influence things. Later books introduce successive complications, but those drift rapidly away from this trope.
 * The Black Company starts out with the can already having been opened but not all of the way in a bit of evil on evil backstabbery. Their employer was sealed away by the White Rose but then released by a group of sorcerers called the Resurrectionists. As thanks the Lady, a powerful sorceress who was sealed in there, kills them and then prevents her husband from getting out so she can keep the power to herself. Needless to say, he is not pleased and it's implied the world is doomed if he ever does get out.
 * Not to mention that
 * In Deep Wizardry, the second Young Wizards novel, the seal on the Lone Power's can is weakening and needs to be recharged. However, what is sealed is only one aspect out of many that the Lone Power possesses, so It can be safely sealed away in one place while simultaneously being an active menace somewhere else.
 * Then in A Wizard's Holiday, the protagonists have to, among other things,.
 * The Dark Ones in The Wizard Of 4 th Street by Simon Hawke were sealed with the accumulated Life Energy of a massive Heroic Sacrifice.
 * In the Dragonlance novels, and D&D campaign setting, Takhisis was essentially a sealed evil in a can from the end of the Third Dragonwar, when Huma Dragonbane forced her to swear to leave Krynn and never return, and the Cataclysm, when she found a way to get around that oath. In an interesting variation on this trope, it was when Berem stole the emerald from the pillar of Takhisis' temple, killing his sister Jasla in the process, that Takhisis was partially resealed.
 * She was actually able to get around her oath because of the Cataclysm — its precise wording was that she would never return "while the world was whole". With half the main continent blown up, the world was no longer whole so she was able to return. It's a bit of a stretch, but Takhisis is the Queen of Darkness.
 * In the series The Wheel of Time, the Dark One is making good progress in eroding the makeshift seal on the hole in the Creator-made prison that's kept it imprisoned for thousands of years. The hole was made back during what is known by the timeline of the books as the Age of Legends, although they did manage to patch it up again as best they could. Being as it is the God of Evil, existing outside reality, sealing and resealing really is the only option. During his resealing, his 13 highest-ranking disciples were sealed (mostly) outside of time as well, they ended up being freed first to pave the way for his return.
 * Stasis Boxes pretty much fit this trope when used for preserving the Gholams, not-quite-undead super assassins from the War of Power, beyond time and space.
 * How about Mierin's experiment in the Age of Legends that let the Dark One out in the first place? Even better because back then, nobody knew the Dark One existed, and her experiment was intended to tap a greater source of magical power able to be used by men and women (as opposed to the separate halfs of the one power). She later became Lanfear, one of the Forsaken, the most powerful servants of the dark one, though judging by a bit of Aiel ancestral memory that is tapped into, she was not evil to begin with, ie at the time of her experiment (as part of a team).
 * Mordeth/Mashadar is/are unable to leave Shadar Logoth after the fall of Aridhol (why is never really explained, but perhaps it was sealed intentionally). Mat Cauthon (or Padan Fain, or both) release it into the world at large after Mat removes the dagger. Of course the can later.
 * The insane clone Dark Jedi Master Joruus C'baoth more or less sealed himself, ending up on the planet that The Emperor used as a personal museum/storehouse. C'baoth had no interest in the storehouse facility even after killing its guardian, and inhabitants of the planet had roughly feudal levels of technology. So he stayed there and ruled them, using his raw Force abilities and sort of mass mind-control to keep them cowed and obedient. Then Grand Admiral Thrawn showed up and recruited C'baoth with promises of new Force-sensitives to train and mold, both because C'baoth's Battle Meditation could allow great synchronization and increased efficiency in the fleet, and because he wanted the cloning technology in the facility. Thrawn's second in command really did not want to rely at all on someone so unreliable, but he was overruled. C'baoth's inevitable attempt at seizing power involved taking control of the entire Imperial fleet; when Thrawn talked him down and sent him back to that planet, C'baoth's next plan started with brainwashing an officer to the point where he had no will or mind anymore and died shortly after being taken away from the insane Master.
 * Another example of sorts in the same trilogy — an insane Bpfasshi Dark Jedi had been killed by Yoda on Dagobah, and his essence infused the tree where Luke had his pivotal vision during The Empire Strikes Back.
 * Vernor Vinge's A Fire Upon the Deep starts off with a cosmic menace called the Blight being woken by insufficiently paranoid humans.
 * Daniel Keys Moran's The Last Dancer has a scientific team releasing an ancient human, whose physical conditioning and skills approach Badass Normal from the other side and who has a major attitude problem (compare World of Ptavvs above). He proceeds to spend the rest of the book mainly kicking the other Big Bad's ass, making him not so much Evil, just Sealed Badass In A Can.
 * Not truly evil, but definitely not good. In the Discworld novel Hogfather, Archchancellor Ridcully decides to unseal the door to a special bathtub invented by Bergoldt Stuttley "Bloody Stupid" Johnson, simply because it was barred shut. When asked why he wanted it opened, he replied, "To see why they wanted it shut, of course!" Terry Pratchett added the following footnote:

"Gonko: You come get your chuckles whenever you're ready, 'cause if they ain't lettin' me go, they ain't lettin' you go. Best believe that. Show's down but not out, mark my words. We'll be back in town, my pretty, and I don't recall offering you a severance package."
 * Pratchett also explores this theme in Reaper Man, where, in a time when Death is non-existant, Evil returns in the form of dinky little snow-globes that people want to love and cherish, since as you pick them up and shake them, snow appears to fall around models of city landmarks, and look, they'e even labelled A Present From Ankh-Morpork, how cool is that? But the globes are seeds of a potent and cruel ancestral evil that peys upon and kills cities....
 * Peter F. Hamilton does this in at least two series: in The Nights Dawn Trilogy Series, a wandering alien accidentally opens a portal to the afterlife, and in Pandora's Star and Judas Unchained, an alien menace is released by its hidden enemy (who has ).
 * Subverted in M. T. Anderson's book Thirsty, in which a group of vampires are trying to free the Sealed Evil, the god of vampires, and one character pretends to be trying to kill the vampire god in order to protect humanity, but in reality is assisting the god in committing suicide.
 * In Harry Potter and The Chamber of Secrets, the titular chamber contains.
 * Also in the same volume, Tom Riddle's diary has the "memory" of the teenage Voldemort sealed inside, which Ginny unknowingly awakens through her liberal use of the diary.
 * In Harry Potter, it's implied that Voldemort's final fate is to remain in a sort of limbo (specifically, ) forever, incapable of harming anyone ever again.
 * In James Alan Gardner's Hunted, the Mandasars have queens who are very smart, very large, very strong, can persuade other Mandasars to do just about anything by emitting the right pheromones, and are physiologically hardwired so that each queen believes that she is the most competent person around and should be in charge. Having more than about four of them on the planet tends to mean endless power struggles; having that few risks having them all die. The solution implemented is to have a bunch of queens in cryonic storage. While they aren't evil per se, waking them all up at once is still really, really bad.
 * In William King's Warhammer 40000 Space Wolf novel Ragnor's Claw, Botchulaz.
 * In Garth Nix's Old Kingdom trilogy, the latter two books lead up to the release of Orannis the Destroyer, the Big Bad, from his "can".
 * Quite a few of John Connolly's short stories involve Sealed Evil in a Can: the Daemon buried under the church in "Mr Pettinger's Daemon"; the Fairies trapped inside their fort in "The New Daughter"; the monster chained up at the bottom of the lake in "Deep Dark Green"; the nest of hibernating giant spiders in "The Wakeford Abyss"...
 * Also, in his novel The Black Angel, the fallen angel Immael is plunged into a vat of molten silver during the Backstory and the resulting statue becomes the angel's prison for several centuries. Naturally, the novel itself is all about Immael's twin brother and his followers attempting to free him.
 * In John C. Wright's Chronicles of Chaos, children being held hostage by  are nevertheless not sure that their own parents are entirely in the right; they find out, in due course, that they are hostage to prevent the forces of Chaos from moving against the universe and destroying it.
 * In Gerald Brom's The Plucker, the titular monster is sealed within a voodoo spirit doll. It's up to regular dolls to stop it when it is accidentally freed.
 * Using the Greek Titans myth cited above as a jumping-off point, the main plot arc of Rick Riordan's Percy Jackson and The Olympians series involves the Titan lord Kronos attempting to escape his can.
 * Something Bad is waiting in Charles Stross's The Jennifer Morgue....
 * In Mistborn, Ruin, the primal force of chaos and destruction was imprisoned by his "good" counterpart Preservation after they teamed up to create life. This is a bit more complicated than most examples because Preservation split Ruin apart to make his release more difficult. Ruin's mind was put in, while the bulk of his power was bound into  . The problem was, even an imprisoned Ruin still had some power, so he
 * The Pilo Family Circus is built on the prison for a  The circus' managers, Kurt and George Pilo, do   bidding by causing as much havoc on Earth as possible — in the hope that whoever jailed   will be forced to negotiate   sentence. However, their attempts at escape are temporarily foiled when the circus is closed down and most of its staff killed at the end of the novel — though the main character's dreams suggest that it will return one day.


 * While not a single character, the Mijaki were confined to the borders of their lands in Karen Miller's Godspeaker Trilogy because they made the world evil. Hekat then decides to change things.
 * In Mitchell Scalon's Warhammer 40000 Horus Heresy novel Descent of Angels, Lion (with Luther's help) unites Caliban to exterminate its horrific monsters, despite warnings that this might ruin Caliban. In Mike Lee's Fallen Angels, it is revealed that the monsters stemmed from Chaos taint, and so kept the people untainted, since they would avoid the monsters; killing them unleashed the taint.
 * In Dan Abnett's Warhammer 40000 novel Brothers of the Snake, the Requisite Royal Regalia were keeping a Chaos force in check. When they were removed for a coronation, Weather Dissonance broke out, to be followed by more serious Chaos monstrosities, and an Inquisitor and a squad of space marines had to return the regalia to stop it.
 * In the Stephen King novel Duma Key, the villain, Perse, is an evil doll/creature who is literally sealed in a keg which was dropped down a well. Unfortunately, the keg had been leaking for some time and by the time the main character finds it, it's almost empty. He eventually ends up
 * Another king example is the short story "The Crate", later adapted as one of the segments of Creepshow, where a crate containing a terrible monster is opened by a janitor.
 * The T'lan Imass of the Malazan Book of the Fallen are notable offenders for this. During their genocidal war against the Jaghut and, off-and-on, the Forkrul Assail, they developed a ritual for binding enemies when they lacked the strength to directly kill them. Either pinned under massive stone slabs or buried in barrows, it's not uncommon for their ancient enemies to be unearthed.
 * The Azath House seals away both good and evil, trapping them until such a time as they are needed in the world or the Azath dies.
 * It's not entirely clear who was doing the sealing, but there have also been cases of bound K'Chain Che'Malle who predate even the T'lan Imass.
 * In Robert E. Howard's Conan the Barbarian story "Literature/{{The Devil in Iron}", a fisherman takes a knife and lets loose an evil city.
 * Thugra Khotan in "Black Colossus".
 * The Scourge in The Black Tattoo.
 * Fablehaven has several examples of these, most notably the demons of Zzyzx.
 * Arguably, a lot of the Immortals of Tamora Pierce's Tortall series, after a bunch of mages locked them up in the Realms of the Gods. It didn't stick.
 * Okoya, the eponymous soul-eater of Thief of Souls, begins the book immobilized on a cliff face. In the prologue, he's unsealed by an earthquake.
 * Morhavon the Black and the place under the palace catacombs where evil spirits are sealed away from the Green Rider series.
 * Several times in the Star Trek Novel Verse. There's the Dithparu (essentially evil spirits), who are trapped by magnetic fields in an Ancient Tomb, Malkus the Mighty, an immortal tyrant whose consciousness was sealed in a box, and The Eight, who got loose in the Star Trek: Voyager Relaunch, setting up a Sequel Hook.
 * In the Zombie Apocalypse novels The Rising and City of the Dead, the obots were sealed by God in another dimension, known as the Void. An experiment Gone Horribly Wrong cracked it open, and Kill'Em All ensued.

Live Action TV
"Ahh! After 10,000 years I'm free! It's time to conquer Earth!"
 * Power Rangers and Super Sentai repeatedly use this trope:
 * Rita Repulsa from the first season of Mighty Morphin Power Rangers was originally trapped in a "space dumpster" on the moon for 10,000 years until astronauts accidentally released her. Her line from the intro sequence is rather iconic:


 * Incidentally, Rita Repulsa's counterpart in Kyoryu Sentai Zyuranger is called Bandora the Witch, a reference to Pandora.
 * To a lesser extent, in the episode "Final Face-Off," Rita opens an urn which imprisoned the legendary Face Stealer. The Rangers lock him back in the urn upon his defeat at the end of the episode.
 * Power Rangers Lightspeed Rescue's villains are released from the "Tomb of Forever" by an unwitting Egyptologist. The villains then go about trying to free their still-sealed Queen. They all more or less end up that way again in the finale when they are either destroyed (sending their spirits back) or by physically being thrown back into the "Tomb of Forever", sealing them in the Shadow World.
 * While not applying to the main villains of Power Rangers Time Force, the individual monsters fit this trope, being mutant prisoners shrunk, cryogenically frozen, and sealed inside small containers. They also return that way when defeated.
 * The Orgs of Wild Force were spirits sealed in the earth 3,000 years ago. They were freed in the present day to possess everyday objects due to pollution and the appearance of a successor to their Big Bad.
 * Power Rangers Ninja Storm has the "Abyss of Evil" that acts as one. Unusually, the Big Bad didn't bust out of there at the beginning of the season; instead it factored into his Evil Plan:
 * In Power Rangers SPD most of the individual monsters and main villains fit this trope, being alien criminals. They are trapped inside special cards when defeated.
 * Rita Repulsa's very line is echoed by the Wolf Knight's first line in Power Rangers Mystic Force (He actually says "After all these years, I'm free," but the similarity was close enough that many fans were confused into thinking the Backstory was set ten thousand years previous, when it actually appears to have been more like 20).
 * In Operation Overdrive all four big bad factions has someone sealed inside a different can. Moltor and Flurious were sealed inside two lifeless planets, one of extreme heat and the other of extreme cold respectively, when they tried to grab the season's MacGuffin, and freed when said MacGuffin was discovered on Earth. Kamdor is initially sealed in a blue gem necklace until he is freed with a stolen device by his partner Miratrix, who incidentally later becomes sealed in same said necklace when Kamdor double crosses her. Then there is the "Prison Mirror" which contains an army of Fearcats, but was destroyed with only Benglo escaping. In another episode, Thrax, the son of Rita and Zedd, repeats the same line his mother made when released from a Space Dumpster, after what could not have been more than two or three years.
 * Jungle Fury has Dai Shi, who has been stuck in an (unlocked!) box for 10,000 years. The box was kept by a secret order, but opened when a disgruntled student barged in and attacked the order's master, knocking the box out of his hands. Unusually, however, Dai Shi is significantly weaker than he was, and has to struggle to regain his powers before the rangers become strong enough to destroy him.
 * Dai Shi's "seal" makes a Funny Aneurysm Moment out of Juken Sentai Gekiranger's Jan, whatever you decide to do with him in the end, please for the love of God invest in a lock.
 * This season also had other sealed cans. The Crystal Eyes for the Phantom Beasts, The Overlords lifeless bodies/shells & two of the "5 Fingers of Poison" urns with broken remains (both revived by Naja's life talons), the various statue soldiers brought to life as monsters of the day, and the Spirit World (at the finale) which acted as both a sealed can of evil (for Dai Shi's fallen minions) and a sealed can of good (for the fallen Masters).
 * Venjix from Power Rangers RPM began its existence more or less as a sealed evil. The program for the sentient, self-replicating, computer virus was initially created and contained in a single laptop. That is until Dr. K, in a attempt to escape her circumstances, decided to infect Alphabet Soup's computer network with the virus but was stopped short from installing a firewall to prevent further spread. The result was an infection of nearly every computer system connected to the internet and the destruction of nearly the entire human race.
 * It is hinted that Venjix also becomes one of these again, as opposed to being destroyed, at the end of RPM with the Venjix Palace music playing as the camera focuses in on Ranger Red's morpher with a blinking red light.
 * The Sanzu River from Power Rangers Samurai and Samurai Sentai Shinkenger is one to the Master Xandred/Chimatsuri Dokoku and the Nighloks/Gedoushu while the river level is low. Only a monster and some Mooks are able to go out at a time, trying to increase peoples' despair and sorrow in order to make the Sanzu's level rise until it seeps into and floods the human world.
 * Star Trek used this a few times.
 * Khan Noonien Singh and his cryogenically frozen followers, in the TOS episode Space Seed. And again in Star Trek II: The Wrath of Khan, when he's abandoned on Ceti Alpha V (which the crew of the Reliant mistake for Ceti Alpha VI after a natural disaster alters its orbit and destroys its environment).
 * In the classic series episode "The Alternative Factor", if Lazarus and his insane counterpart from the antimatter dimension were ever to meet in the same universe, that universe would be destroyed. Both of them are sent into an intermediate dimension so that this can never happen, and where the two of them will be locked in combat for all eternity.
 * in Star Trek V. He claimed to have been imprisoned and wanted to  so he could escape.
 * Data's evil "brother" Lore. He's found disassembled in Dr. Soong's lab and the Enterprise crew make the mistake of putting him back together.
 * Well, in the animated version episode "Beyond the Farthest Star", Kirk tricked an ancient evil entity onto a black dwarf star, where it moans about how lonely it is as the credits roll.
 * This was supposedly the plot behind the Star Trek: Voyager episode "Dragon's Teeth", when Seven of Nine releases an alien race from a 900-year stasis... only for them to turn out to be your bog-standard Villains of the Week piloting obsolete spaceships. Disappointing.
 * The Star Trek: Enterprise episode "Regeneration" features Borg in the ice.
 * Another episode played off the Real Life example (see below) of nuclear waste- Data is injured while retrieving said material from a crashed Starfleet ship, and after the ensuing memory loss he stumbles into a local village. His radioactive-shielded briefcase doesn't stay closed for long.
 * Many, many examples in Buffy the Vampire Slayer (the Judge, Acathla, others) and Angel (Illyria, Pavayne,Sajan). In fact, the Angel example showed us a veritable warehouse of sealed demon gods like Illyria, which (as of the end of the series) is left unguarded.
 * There is also a very literal variant in the Buffy episode "Get It Done", when
 * The aliens of War of the Worlds were literally sealed in cans at the opening of the series.
 * Despite the frequent use of the "Pandora's box" analogy, it was really Earth that was sealed in a can at the beginning of Stargate SG-1. On the other hand, there are several examples of villains being effectively sealed in cans, such as Osiris (who was in a canopic jar), Anubis' son (in a stasis chamber), the Wraith (hibernating), and the Ori (in a distant galaxy blissfully unaware that free humans existed).
 * One of the most literal Stargate SG-1 examples would be Hathor, who had been sealed in her sarcophagus for 4,000 years, only for some unwitting archaeologist to open it.
 * As well as Marduk.  And then Our Heroes go poking around in there...
 * The Replicators were sealed in a can by the Asgard, but It Gets Worse when the Replicators outwit the trap and crank it Up to Eleven before SG-1 arrive to fix the can.
 * One episode of Highlander the Series featured a Nazi Immortal who had been chained and thrown into a river by a young boy. How do you make a Nazi cross? Forty years of drowning and reviving every few minutes ought to do it...
 * There is at least one story of an Immortal being on a sunken ship and having to walk back -- Kit O'Brady was on a boat to Alaska when it sank, and said it took him months to walk back.
 * And then there's the example of the Immortal stranded on a deserted island for years, dying of starvation and thirst every so often, just to wake up and do it again. For some reason he held a grudge...
 * In the Doctor Who episode "The Satan Pit", a being known only as "the Beast" (who claims to be Satan) is revealed to be at the core of a planet perilously held inside of a black hole's event horizon. Any attempt to escape would wreck the system that kept the planet out of the black hole's gravity, thus sucking it and the Beast into the black hole.
 * The original series used this trope often. Sutekh The Destroyer in "Pyramids of Mars", Omega in "The Three Doctors" and "Arc of Infinity", the Ice Warriors, the mutagen under the Earth crust in "Inferno", the Krynoid pods in "The Seeds of Doom", and many more.
 * A slight variation happened in "The Stones of Blood", where the Doctor releases a pair of biomechanical judges from a ship stranded in hyperspace,
 * "Doomsday" features the Genesis Ark: a Time Lord device imprisoning millions of Daleks. "Time Lord science: it's Bigger on the Inside."
 * In the new series episode "The Runaway Bride," it is revealed that the centre of the Earth contains hundreds -- possibly thousands -- of omnivorous intelligent alien spiders. Indeed, the vessel that holds them is the original core of the planet, nearly five billion years old.
 * In the episode "The Pandorica Opens", the Doctor investigates the eponymous Pandorica, which is advertised as containing the most feared being in the universe and is starting to open. The Doctor is predictably fascinated; "What could be so dangerous?" he wonders.
 * In "The Waters of Mars", Humans accidentally released Sealed Evil in a Glacier.
 * The first Torchwood season finale features who was sealed within the Cardiff Rift.
 * In The Sarah Jane Adventures,
 * Heroes: was imprisoned for thirty years after he tried to release a virus that would have killed most of mankind. Then, after being released (and having done plenty of damage in the meantime, including a second attempt at the virus thing) he was sealed in a coffin deep beneath a cemetery.
 * In Season 3,
 * himself has elements of this, starting off the series on life support and only able to communicate through telepathy.
 * As of Volume 4's finale It didn't last.
 * Volume 5 has
 * In The Twilight Zone TOS episode "The Howling Man," the evil sealed in a cell was the Devil himself.
 * In Babylon 5, the Shadows were something like this, except that they weren't sealed by other people. They regularly hibernate and wake themselves up.
 * The Thirdspace aliens are effectively sealed until their gateway is opened.
 * Also The Hand. (Who are probably the Thirdspace aliens anyway.)
 * One episode from Los Luchadores dealt with a plot to awaken a demon in a ritual involving three descendants of the people responsible for originally sealing it. In this case, the ritual is successfully interrupted just before its completion, denying the audience the spectacle of watching an ancient evil being defeated by a masked professional wrestler.
 * In the original and revived Dark Shadows, vampire Barnabas Collins made his series debut when he was released from the chained-up coffin in which his father, unable to go through with staking his own son, had sealed him.
 * Supernatural has used so many variants of this it's basically the only kind of Myth Arc they've ever had, but at least it always varies: Devil's Gate was opened with no warning and a bunch of stuff got out along with the actual new Big Bad; Lucifer was freed by Thanatos Gambit; the Leviathan were the real problem with opening Purgatory since Cas managed not to blow up the universe, but Death didn't have the decency to warn the characters about them...
 * Formed the central arc of Supernatural's fourth season.  is imprisoned in Hell and Lilith is out trying to release him... guess how that turns out.
 * As it turns out, they manage to  although he's.
 * And one of the seals used to seal was itself undoing the seal that kept in Samhain. (Which is a demon that raises the dead and pronounced Sam-Hane. Ugh.)
 * Azazel's goal in the season 2 finale was to open a Devil's Gate in Wyoming in order to.
 * In the sixth season, we have Purgatory, the place that creatures who don't belong in either Heaven or Hell go when they die. This seems to make it a repository of monster souls; it also contains a being known as the "Mother of All" which they call Eve, probably because they already used the names Lilith and Tiamat for other purposes, and apparently some very nasty formless things that were never alive in the normal sense.  work together to open it in order to use the monster souls as a power source, but there are side effects.
 * And then the first episode of the seventh season reveals that.
 * To put it simply, thus far the end of every even-numbered season has involved letting some great evil out of its can. Seasons three, five, and seven have been about dealing with these evils (which are, in order, a plague of demons led by Lilith, then Lucifer, then the Leviathans. Evil in this show also tends to start with L.)
 * In Lost, . It is implied that   is the evil being imprisoned.
 * In Lexx, Kia is an assassin who spends most of his time frozen so he's save his protoblood for when he's needed, which is pretty much only when someone needs to be killed.
 * A sketch on Monty Python's Flying Circus has the funniest joke in the world being buried after World War II so it can never kill anyone again.
 * The Kamen Rider series uses this in several series.
 * In Kamen Rider Kuuga, the Grongi were imprisoned in a tomb by.
 * In Kamen Rider Agito, the  has a somewhat odd version of this,
 * Kamen Rider Blade has the Undead, who have been imprisoned since the beginning of time, after serving their purpose and deciding the dominate species of life on Earth. Though since not all of them are evil, some would be Sealed Good in a Can and since most of them just want to fight one another, they would be Sealed Badass in a Can. The Roaches and Black Joker defiently fit the trope though. There's also Jashin 14 in The Movie.
 * In the newest series, Kamen Rider OOO, the Greeed have been imprisoned in a stone box for 800 years until they're released during a robbery. The stone box?.
 * In Fringe, the pieces of the First People's Machine, which has the power to, were scattered all across the globe and buried hundreds of feet underground.
 * In Smallville's fifth season, Brainiac's primary goal is to release Zod from the Phantom Zone. He eventually succeeds in the season finale and Zod's first action upon being freed is to put Clark Kent into the same can that he just escaped from.
 * Clark manages to escape on his own, without help from the outside, and subsequently reimprisons Zod in the season six premiere. He then spends the rest of season six hunting down the other Phantom Zone prisoners who escaped at the same time he did one by one and either killing or preferably reimprisoning them.
 * In Forever Knight, LaCroix's daughter was sealed inside a coffin after LaCroix staked her. The Egyptian sun disk kept her prisoner much like a Christian cross, until she was released by grave robbers and came after him and his children.
 * Also pops up in the first Forever Knight novel, "A Stirring of Dust".
 * In Tracker, Zin gets sealed in an underground vault during his attempt to steal the alien weapon hidden there.
 * Merlin and the goblin, who was sealed in a box, then escaped to torment everyone in the castle, and then resealed after being trapped by Merlin and Gwen.

Music
""As is the case with all ancient evils, 80's rock music was never sealed away in a very permanent fashion.""
 * Pretty much every Bal Sagoth song starts with "Oh shit, we just woke up Cthulhu." This is all the more impressive considering that (actually) awakening an elder god would crush the mind of anyone near it, then plunge the Earth into a never ending night.
 * "Bark at the Moon" by Ozzy Osbourne is about a beast that once terrorized a town, but was eventually buried in a nameless grave. And then he ends up returning to cause some more destruction.
 * Just saw this in the opening of an article about the third Guitar Hero game:


 * In "Gatekeeper" by Within Temptation sort of meets Taking You with Me.

Mythology and Religion

 * This trope hearkens back to the Greek Mythology of Pandora's Box.
 * The box iself is an unusual case, as it was created and given to her for no other reason than Zeus felt like being a dick.
 * A little more detail: after seeing all the atrocities emanating from the box, Pandora quickly shut it, leaving only one thing inside -- Hope. As aforementioned, all according to Zeus' plan.
 * The Titans were locked inside Tartarus, a dank, gloomy prison "as far beneath Hades as heaven is high above the Earth", where they were guarded by their siblings the Hecatonchires.
 * Typhon was trapped beneath a mountain by Zeus.
 * Norse Mythology: Unbreakable magic chains kept Fenrir (a gigantic wolf so massive that is must crouch down to avoid scraping against the dome of the sky) bound, until he eventually breaks them. Ironically, it is implied that binding him is what made him so pissed off at the Gods in the first place. (Well, that's the trouble with prophecies... and he is a child of Loki, God of betrayal, mischief, and "evil".
 * That kind of thing happens a lot in Norse mythology. The Gods were so afraid that Loki and his monstrous children might turn against them, that they imprisoned them all in various unpleasant ways... thus ensuring their pissed off-ness and guaranteeing Ragnarök when they eventually get out.
 * Ragnarök could be best be described as every Can in Norse Mythology opening at once. Everything broke free. Jormungandr, Fenri, Loki, the forces of Hel, Garm, etc.
 * The legends of genies often fall under this trope. Not all genies are good, ya see, and even the good ones will interpret wishes literally.
 * Moreover, the Ur Example for many of the bad jinn/wicked ifrit stories is the tale that Solomon/Sulayman used his ring to seal (yes seal, with molten lead and a magic seal ring) a number of bad jinn into brazen urns (which is a fancy name for brass cans) and cast them into the ocean, only to have them later dredged up as in stories like "The Fisherman and the Genie." Since this has an evil spirit sealed in an actual can, this makes this trope 'Older Than Feudalism.'
 * In The Bible, specifically in the Revelation (not Revelations) of John, Satan is going to be confined to the bottomless pit for 1,000 years, after which he'll be released to wreak havoc upon the world one last time. Then God will smoke Satan's entire army at the Final Battle, and then he will be thrown into the Lake of Fire to stay.
 * It's pretty much what happens at the end of the Left Behind book Kingdom Come, with the Other Light faction serving as Satan's Final Battle army. In fact, the Other Light subsect The Only Light believes that Satan purposely sealed himself away so that he could be powerful enough to defeat God (whom the Only Light believes doesn't exist despite visible evidence to the contrary) and all those who follow Him when Satan is released. Which, unfortunately for them, didn't turn out as they expected.
 * According to Scientology's OT III, Xenu is apparently still locked up in a mountain somewhere.
 * According to Islam, Dhu'l-Qarnayn, or "He of the Two Horns" (a lesser prophet who appeared long before Muhammad) encountered a race of monsters (split into two tribes, the Yahjuj and Mahjuj, or Gog and Magog of Biblical fame) that were harassing the people, so he built a giant wall to keep them enclosed. They won't be able to escape until Allah says so, which will be during the lead-up to Yawm al-Qiyāmah (the Day of Judgment).

Tabletop Games

 * In Dungeons & Dragons 4th Edition, the entire plane of Baator is like this, being created by a divine curse to imprison the Magnificent Bastard Asmodeus and the devils. Unfortunately, said can is rather flimsy, and while it does a good job of holding Asmodeus, any infernalist worth his salt can create a temporary portal to it, allowing the devils to stream through and wreak havoc and contracts.
 * Of course, the seal wasn't made to save mortals from Asmodeus and his devils -- but to save the other gods from him. Hence why mortals are free to poke holes at the seal and let devils come and do Faustian pacts. Of course, if you are dumb enough to do it, you deserve what's coming to you.
 * You have grasped the entire concept wonderfully. Asmodeus will be pleased.
 * Another D&D example: in the Scarred Lands setting, in the backstory the current gods sealed the evil gods that ruled before them, each in a different way befitting them and tailored so that their powers couldn't get them out. This editor's personal favorite: Thulkas, the Iron Lord, was so strong that he couldn't be moved, so he was hammered into an arrow and shot into the sun.
 * The Scarred Lands also has the Slarecians, psionic beings who challenged both the gods and the titans. The twist is is that they sealed themselves into the can so they wouldn't be destroyed.
 * In the published version of B3: Palace of the Silver Princess, a huge ruby called My Lady's Heart turns out to be a Canopener for an evil Immortal, Arik. Even the leakage of Arik's power which the gem emits is enough to petrify an entire royal court, trap its best defenders in a dimensional prison, and attract monsters and fanatical dark priests from hundreds of miles around.
 * An important part of Eberron is that there are multiple Sealed Evils in various Cans, with sealants as strong as the plot demands of them.
 * The massive Ptolus setting by Monte Cook is set on the world of Praemal, which exists as a giant can in which to seal evil. The city of Ptolus itself is built on top of a can or ten and has a giant, impossibly high spire in it where a cleric once, long ago, tried to seal all the evils of the world in a can. Of course, then he became evil, and eventually his fortress atop the spire was itself sealed with the remains of his work (and his remains) within it. It's a pretty can-heavy setting.
 * Another notable example of sealed evil in a can in the Points of Light setting is Torog, god of torture and imprisonment. The kicker? The earth is his can. He's trapped in the underdark, actively crawling around down there, and occasionally reaches up from below the earth to pull whole cities down into his can with him.
 * In the Greyhawk setting: Zuggtmoy (in the Temple of Elemental Evil), Iuz and Fraz-Urb-Iuu (in Castle Greyhawk) and Tharizdun (in his Forgotten Temple).
 * In the Midnight setting there is the evil god Izrador, who was sealed (along with some other beings) in the world of Aryth. The bad part ? Your characters live on Aryth and they're also sealed there. Not only is the evil in the can but you're in the can with it. Crapsack World indeed.
 * Many examples from Warhammer 40000:
 * Daemon weapons contain bound daemons within them, giving them incredible power and just as incredible malevolence. However, the greatest threat isn't them escaping, but rather corrupting the weapon's wielder and twisting them to its will.
 * More powerful daemons, who couldn't at the time be banished back to the Warp, are often sealed in the Materium in some way that prevents them from killyfying everything at the moment, perhaps in the hope that they can be banished later. This being WH40K, not only does the sealing frequently make things worse, but most of the time those doing the sealing never tell anyone about it.
 * Both literal and metaphorical in the case of the Necrons and their C'tan masters, who sealed themselves deep beneath the surface of numerous worlds approximately sixty million years ago.
 * The God-Emperor is either a Sealed Evil, a Sealed Good or a Sealed Badass, depending on one's perspective.
 * In the prehistory of Exalted, the defeated Primordials were stitched into the twisted body of their god-king Malfeas and confined to another realm... mainly because the Exalted looked upon the Primordials who had been killed, seen that they'd brought the Underworld into existence, and said, "Yeah, that ain't supposed to happen."
 * There are also the Neverborn, the aforementioned Primordials that had been killed. Being too big to die properly, they instead wrapped themselves up in giant sarcophagi spanning infinite distances as they resisted the pull of Oblivion. Then the Solars decided to pop a few blocks open to learn Necromancy...
 * From the perspective of the Bronze Faction, this was the case for the Solar Exaltations locked in the Jade Prison for ~2000 years.
 * Scion, by the same company, uses the same logic surrounding the Titans. At the end of the Titanomachy, the gods bound them away in the various Underworlds -- this was because the Titans were incarnations of things such as Light, Fire, Darkness, Life, and Water, and their death would screw with reality big time. This was proven when Ymir was killed... causing the Great Flood, as the Ice Age ended right then and there.
 * Champions adventure The Blood and Dr. McQuark. Azor (an agent of some Eldritch Abominations) was imprisoned by the Council of Nine but escapes during the course of the adventure.
 * In the game Neuroshima there is a number of items scattered around the world, which adventurers refer to as Pandora's boxes. Each is a large metal canister that contains something nasty (from biological weapon to a very compact assassin droid). Everyone knows what they are but humans being humans, every once in a while someone opens one, either because of the Schmuck Bait involved or in some desperate gambit against his enemies.
 * In Iron Kingdoms the Skorne have Ancestral Guardians, which are statues empowered by the souls of fallen Skorne warriors.

Toys

 * Bionicle: Makuta Teridax encased in a Toa Seal by the Toa Metru by their Elemental Powers, but much later they unintentionally released him with the same powers when they attacked Roodaka holding a piece of the Toa Seal.

Video Games
This is an extremely common plot and backstory in video games because it's such a simple backstory: the Big Bad, put away by some ancient hero, has escaped. You (the player) must put him back in. "Bentusi: We will NOT be bound!"
 * Dawn of War, the original one, has an absolutely beautiful example. An ancient demon imprisoned in a stone manipulates Orks into attacking human cities on the planet. Space Marines come to the rescue and do what Space marines do best - spill ungodly amounts of Orkish and human blood - just so at the end, the demon can reveal that . Bonus points: most characters wanting to use demon or its power for their own end up badly.
 * The Chaos Rising expansion to Dawn Of War 2 also features a plot to unseal a demon trapped inside a planet that was lost in the Warp.
 * In Dark Messiah of Might and Magic the Demon lord is locked in a prison under the city of Stonehelm, however the original prison is flawed and can be broken, the player can choose to get the good ending and seal him away forever by repairing the seal or get the bad ending by releasing him.
 * In the first Avernum/Exile game, there is the Haakai Lord Grah-Hoth, who was sealed in a bottle before the game begins.
 * Every game in the main Tengai Makyou series.
 * Ziria has the Daimon Cult trying to revive Masakado.
 * Manjimaru has the Root Clan trying to revive Yomi.
 * Fuun Kabuki Den has the Daimon Cult trying to revive Garp.
 * Fourth Apocalpyse has the Dark Society trying to revive their Absolute God.
 * In Tomb Raider and the remake, Tomb Raider Anniversary,
 * In Okage: Shadow King, King Stan has been (purportedly) stuck in a bottle for the last 300 years, waiting for someone wimpy enough to let them possess his shadow. Additionally, while he was stuck in the bottle, a number of monsters stole portions of his evil power and became "Fake Evil Kings". He then drags the main character around to defeat them and get his powers back so he can take over the world.
 * In Rune Factory 2, mysterious earthquakes start happening about a third of the way into the game. Eventually, the character's child finds these are being caused by a Sealed Evil in a Can which is about to escape and destroy the world.
 * In many of the Zelda games, Ganon is a sealed evil. Link must either re-seal him or stop him from fully unsealing himself or his power. (The first time he is sealed away actually takes place at the end of The Legend of Zelda Ocarina of Time.)
 * So is Vaati, the baddie from the The Legend of Zelda Four Swords games. In The Legend of Zelda the Minish Cap, he starts wrecking havoc as a sorcerer and is sealed for the first time at the end of the game.
 * And there was also Bongo Bongo, the Evil Shadow Spirit from ''Ocarina of Time' that was sealed in the Bottom of the Well.
 * The Legend of Zelda Spirit Tracks features demon king Malladus, who tyranized the land that would become New-Hyrule, before Tetra and Link arrived and, presumably, helped sealing him. He was sealed underneath vast chains that eventually developed into a railway-system.
 * In The Legend of Zelda Skyward Sword, the God of Evil Demise was sealed by the goddess Hylia. His servant Ghirahim seeks to free him
 * In Evil Zone, the inhabitants of an island dimension sealed away an incarnation of a cosmic destroyer, but couldn't finish the job themselves, so they had to hire out heroes to finish the Big Bad off.
 * In Dark Cloud, the general of an expansionist empire frees the Dark Genie from its place of captivity. At first, it seems to grant his wish by destroying every other nation on the face of the planet, but in the end, it takes over his body to progress towards its final goal -- the complete destruction of everything.
 * Orochi, from The King of Fighters '97.
 * The Dark One of SRMTHFG has nothing on the Profound Darkness in Phantasy Star IV; the Precursors sealed it with an entire solar system.
 * Diablo and his brothers Baal and Mephisto, in the Diablo series from Blizzard, are imprisoned in "soulstones" after being unleashed on Earth when a rebellion kicks them out of Hell. Retconned that they WANTED to be sealed, and then eventually break free and use the soulstones' power to their own end.
 * Illidan Stormrage in Warcraft III, another Blizzard production, is imprisoned in a cage for 10,000 years for continuing to research arcane magic after the night elves had banned its use. Also a subversion in that Illidan is not evil at the time of his imprisonment, but has become obsessed with power and revenge by the time he is freed.
 * In a continuation of this universe, a majority of raid bosses in World of Warcraft are sealed evils. The quests to kill them generally go something like Go beat up these mildly bad dudes who have this Big Ancient Evil imprisoned, so that you can kill him too. One wonders why the player doesn't just say But, they're doing a fine job keeping him imprisoned! What happens if I manage to kill them but the Big Ancient Evil kills me? A variation goes Go beat up these mildly bad dudes who are trying to unseal this Big Ancient Evil before they succeed, then kill the half-unsealed form of the Big Ancient Evil, which makes a little more sense.
 * Warcraft's universe also has the Old Gods, very similar to Lovecraft's Great Old Ones, sealed beneath the world and waiting to be freed. For the longest time, it was a total mystery why the god-esque Titans didn't just kill them all, considering they'd managed to off one. Recently it was revealed that the Old Gods are parasites who have bonded with the planet of Azeroth so that killing them will cause untold damage to it. And yet, the players continue killing them for loot...
 * The fourth expansion to World of Warcraft (Cataclysm) involves the unleashing of Deathwing, the Earth Dragon who was slowly driven insane by the Old Gods and imprisoned in Deepholme, the elemental plane of earth. His emergence not only blows up parts of the world, but also opens up the elemental planes, which are full of Sealed Evil in a Can, including the elementals themselves (locked up because they were tearing the world apart with their wars)
 * Maybe Illidan wasn't evil, but he did kill people with a handwave who tried to stop him from corrupting a lake with the Well's water.
 * Coincidentally, Homeworld: Cataclysm also involves a similar scenario. Somewhere around a million years ago, the extragalactic exploration vessel Naggarok picked up a deadly technoorganic entity in hyperspace. Seeing no way to defeat it, the crew scuttled the engines, trapping the entity in deep space. However, they screwed up as the ship auto-launched az empty lifepod with a transmitter (and some Beast material) onboard. In the present, the Kiith Somtaaw mining ship Kuun-Lan finds the pod and opens it. Cue to a race with time to find both the Naggarok and the new Beast mothership and blow both to smithereens before the whole galaxy suffers a fate worse than death (ship crews aren't simply killed, they're broken down into biomass to function as a makeshift neural interface between ships and the Beast - and judging by the sound of it, it's not exactly painless).


 * The main storyline of The Elder Scrolls: Morrowind focuses around preventing Dagoth Ur, a godlike being imprisoned for 3500 years, from fully regaining his sealed powers.(though he wasn't imprisoned but passed out)
 * Likewise, in its followup, Oblivion, the player must prevent Mehrunes Dagon, lord of the titular realm, from unleashing his forces upon the world. Dagon isn't really sealed IN anything so much as he is kept OUT. In this case, the world is the Can Sealed Against Evil.
 * In The Elder Scrolls V: Skyrim, the Sealed Evil in a Can is Alduin. And he isn't unsealed by someone playing around with something they know nothing about, but was an inevitability since his sealing involved him being cast adrift outside of time. A prophecy describes the events that must transpire before he would end up back in linear time again.
 * Dracula's castle in the Castlevania series is eventually sealed this way after the Dark Lord's death. It's sealed inside the total solar eclipse of 1999. In the solar eclipse of 2035, it sucks in everyone present at the shrine where the sealing took place.
 * Dracula, and Castlevania itself, were also sealed in the underworld throughout most of the series, both of them reappearing on Earth only once every hundred years. But Dracula found so many ways to circumvent that rule that it became more of a "sealed evil in a sieve".
 * In the Expansion Pack of Baldur's Gate 2, the Bonus Boss is the avatar of a very powerful demon lord. You are asked to reseal him in his prison as he's about to break free. Alternatively, you can fight him in an epic battle. However, if you win, you realize that demon lords in Dungeons and Dragons come Back From the Dead very, very quickly by definition. So it will happen, though not for the rest of the game. Good going.
 * Well they don't actually die, destroying their physical form returns them to their home plane, in his case it frees his avatar back into the abyss to be reabsorbed by the real one.
 * Kangaxx the demi-lich is another example. He dies very permanently after underestimating you, however.
 * Doctor Robotnik/Eggman of the Sonic the Hedgehog series has unsealed so many evils from their cans in attempts to achieve world domination, that you wonder why he doesn't just go back to trying to take over the world in the old-fashioned way: i.e. by imprisoning all the animals in robots (Sealed Good in a Can?).
 * He thankfully did, just replace "animals" with "Starfish Aliens called Wisps" and that's the plot of Sonic Colors.
 * In a case entirely unrelated to Eggman (and despite how people are trying so goddamn hard to forget about the sucky game connected to it), Princess Elise served as Iblis' can, with her control over her sorrow being the lid -- if she cries, the can is opened and Iblis is unleashed upon the world once more. Somewhere else, Mephiles is sealed away in the Scepter of Darkness, at least until Eggman interferes. This is a double seal, as Iblis is but one half of Solaris, and Mephiles is the other. Three guesses to how Mephiles plans to reunite with Iblis; all guesses after the first don't count.
 * Shadow made his first appearance as this, though being canned and going evil didn't happen at the same time:
 * Sonic Unleashed has Dark Gaia who was sealed within the planet by his light counterpart in a neverending cycle of planetary death and rebirth. Like any Cosmic Horror worth its salt, the mere act of Dark Gaia waking up spells The End of the World as We Know It, which thankfully didn't happen this time around.
 * In Paper Mario: The Thousand-Year Door, the plan of the antagonists is to
 * On the other hand,
 * In Super Paper Mario, Bonechill, a fallen Nimbi, was held in the area of the Underwhere in which the dead villains suffer for eternity among the game overed. He escapes due to an earthquake (often speculated to be the work of the Big Bad, Count Bleck, who is known to be a dimension traveler) and wreaks havoc in the Overthere. Mario, Peach, Bowser, and Luigi fight him and easily destroy him.
 * In Mario & Luigi: Bowser's Inside Story, Fawful infected the Mushroom Kingdom with blorbs to distract Mario and released the Dark Star in order to absorb its power.
 * In Luigi's Mansion, major ghosts that Luigi encountered were once imprisoned inside portraits, but were released by King Boo once E. Gadd captured Boolossus. Eventually they are recaptured by Luigi and put back in their portraits, including King Boo himself... although in the next game he has apparently been released to fight Mario. He is killed this time and next time he is fought (in this case by Peach).
 * The Shadow Demons in Medievil were sealed in the heart of the Enchanted Forest under an iron dome, locked with the Shadow Artifact. In order to get through the forest and to his next destination, Sir Dan Fortesque is forced to free them; he later makes up for it by trapping them in an abandoned castle and dropping it into lava, destroying them.
 * In the Halo series, the bad guys accidentally release the Flood, a race of alien parasites that were sealed in special facilities all over the galaxy at the end of a cataclysmic war between them and the Forerunners 100,000 years ago. This war ended with the extinction of all sentient life in the galaxy, so it's a wonder why the Forerunners left little pockets of Flood spores for nosey aliens to stumble across. The AI monitor of one of these facilities comments on this (while you're in the middle of fending off a large wave of rotting space-zombies), saying that specimens were kept over after the last outbreak "for study," and remarks that "this decision may have been in error." No shit...
 * Pokémon has an entire species of them, the Spiritomb. Sure, sealing 108 souls into a single keystone makes economic sense, but by the time they get out, they've merged into a single, massively pissed off Pokémon whose Ghost-Dark typing means it has no natural weaknesses, and is pretty powerful to boot. You can catch one, though to unseal it so you can fight it takes a somewhat occluded Sidequest, and the place you release them is a bit intentionally creepy.
 * Spiritomb could actually be Sealed Army in a Can, due to its composition being 108 individual spirits that just happened to fuse together.
 * in Mass Effect actually seal themselves after in order to conserve energy. The only hand the Protheans had in dealing with them was tampering with the Citadel's mass relay after they'd already receded so that they couldn't get back out so easily.
 * The DLC "The Arrival" reveals that left themselves another way in. A special mass relay at the edge of the galaxy that can access any other relay anywhere.
 * In Mass Effect 3
 * The Grotesqueries in Drakengard, with a twist. Also, no one knows the Sealed Evil in a Can exists except possibly the Big Bad. They're concerned about some other thing that comes out when those seals are broken.
 * In Guild Wars, Palawa Joko suffers this fate. Then there's Abaddon and everyone else locked in the Realm of Torment, including . Ultimately, in an attempt to stop Varesh Ossa from opening a gate to the Realm of Torment, you have to let Palawa Joko out of his prison.
 * In Shadow of the Colossus, except there are sixteen cans wandering throughout the area.
 * Quest for Glory is fond of this one. In fact, every game following So You Want to Be a Hero centers around such a plot.
 * Toward the end of Trial by Fire, it is revealed that Ad Avis is trying to summon Iblis, a powerful and evil djinn.
 * In Wages of War, the Demon Sorcerer attempts to free the Demon Lord. (If he succeeds, the Demon Lord's first act is to cast Thermonuclear Blast on the immediate area. As it turns out, this is a legitimate spell, and can be learned in the fifth game.)
 * In a minor twist, in Shadows of Darkness, Avoozl, the Dark One, wasn't quite sealed properly, and the surrounding countryside has suffered for it. Even as the two antagonists (one new, one old) try to release it, it is only through their actions that it can be put away for good.
 * Dragon Fire has a twist of its own - there is a villain working behind the scenes and trying to unleash the Dragon of Doom, but by this point in the series, the hero (under extenuating circumstances) has become strong enough at this point to just kill the thing.
 * King's Quest IV had Pandora's Box show up. Opening it killed Rosella. There was also that infamous lamp in King's Quest V. The Fan Sequel The Silver Lining hints that Pandora's Box will play a part in its plot.
 * A Mess O' Trouble (an excellent Mac WorldBuilder shareware Adventure Game) has two godlike creatures trapped inside time dilation bubbles in some ruins. You know from local historians (and abominations lying around in the ruins) that their civilization was practically constructed by a good creature and then fooled into nearly destroying itself by a bad creature. One is a beautiful Energy Being, the other a dull-looking lizard man. Guess which is which?


 * Most Final Fantasy games feature a Sealed Evil in a can.
 * Final Fantasy III gives us the Cloud of Darkness, the living essence of the power of the Dark (as opposed to the Light of the heroes' world.) The game implies that Xande's machinations allowed it to take form, but it would have remained sealed away in the Dark World had it not been for him opening a portal leading straight into it. The  1,000 years ago, when it was Light surrounding Darkness, and got it Canned within the Dark World. Xande was nothing but a can-opener.
 * Zemus in Final Fantasy IV, who, despite being sealed in was still able to influence events in the world in an almost successful attempt to effectively kill all humans. Notably, he is never released from his can; you raid it.
 * Final Fantasy V's previous generation of heroes, the Braves of Dawn, used the power of the Crystals to seal away Exdeath, who then surreptitiously began to drain the power of the Crystals (either personally or through manipulation.) Additionally, the player learns that, prior to Exdeath, the sorcerer Enuo was the first to harness the power of the Void, and waged war with it until he and all his obscenely powerful demons were thrown into the Dimensional Rift. The Advance version expands upon this by letting the player explore Enuo's prison and vanquish him for good.
 * Also in Final Fantasy V there once was a tree in the Great Forest of Moore used to seal up evil spirits. Eventually, the power of those spirits gave the tree sapience, power, and a whole lot of evil. That tree became Exdeath; a prime example of sealing so much evil away that the can itself turns evil.
 * The Warring Triad of Final Fantasy VI, who started the War of the Magi, sealed themselves away after realizing the destruction they had wrought upon the world, and the Espers hid them away in their own underground kingdom. Then Kefka came and released them, destroying the balance of magic and devastating the world. It also released Humbaba, Deathgaze, and the eight dragons who are released during the apocalypse.
 * Jenova of Final Fantasy VII is a basic example of the trope. In the sequel movie Advent Children, what's left of her is stored in a literal can.
 * In Final Fantasy VIII, Laguna Loire tricks evil sorceress Adel into walking into a specially-prepared technological "tomb" in which he is able to seal her considerable powers. Then he launches it into space and spends the next seventeen years making regular trips to monitor the seal. Predictably enough, catastrophe eventually lets her loose again, but by that point Laguna's son is well-equipped to kill her off for good.
 * Shuyin of Final Fantasy X 2 is a special case. In one sense, he is still sealed within the Den of Woe, but in another sense he is free to wander around within the body of first, then . Also, while his goal is indeed to break free of his prison and destroy the world, this is because he's a Woobie, Destroyer of Worlds, not an Ultimate Evil.
 * In Final Fantasy XII, all the Espers, as well as several other bosses.
 * The Tonberry enemies in the Final Fantasy series also appear to be like this. Despite their goofy appearance, their Grudge attacks suggest that they're like vessels for all the malice and wrath of slain monsters.
 * In Persona 3, the "sealed evil" is -- while the "can" just so happens to be
 * In Persona 3: FES, we find out that  And it's in place not to seal Nyx from attacking Earth. It's for sealing Earth from.
 * The Snow Queen Mask in Persona is definitely one. It's kept in a gym storage room, in a box sealed with MAGIC TALISMANS, and after going on.
 * Kirby Squeak Squad plays with this one a little. What started as a hunt for stolen strawberry shortcake leads to Dedede getting smacked down on false suspicions, Kirby chasing all over the world to get his snack back from the titular menace The best part is that through all of this, you get the feeling that Kirby is still being motivated only to retrieve the cake.
 * Possibly the only case in the Kirby series where opening the can isn't a case of Nice Job Breaking It, Hero takes place in the Meta Knightmare Ultra mode of Kirby Super Star Ultra where Meta Knight questions NOVA, a mechanical, wish granting comet, about an extremely powerful warrior who was safely sealed away because of how powerful he was. Immediately after this he orders NOVA to break the seal on this extremely powerful evil just so he can kick its ass.
 * Interesting in that it's never made clear what he was sealed in. He just kinda... appears.
 * Tomba has the titular main character being given the task of sealing away seven Evil Pigs (eight including "The Real Evil Pig" who is their leader behind the scenes) in color-coordinated "Evil Pig Bags".
 * Turok 2: the objective is to stop the Cosmic Horror Primagen from being unsealed from his can.
 * Dhaos, the villain of Tales of Phantasia, was sealed away by the protagonist's parents, but was released early on in the game by a minor villain he had been manipulating.
 * Boktai 2: Solar Boy Django has a textbook example in its Big Bad, Jormungandr.
 * The Japan only sequel has a similar deal, except its cosmic horror, Vanargand, was sealed on the frickin' MOON.
 * The world of The Magic Candle was narrowly saved from the immortal demon lord Dreax when a few heroes managed to trap him in a candle flame. Keeping him there is the daily task of 44 mages... who have just disappeared. The seal is now critically weakened, leaving the player a set number of days to find out how to fix it.
 * Somewhat unique in that the point of the game is to reactivate the seal, not simply to grind yourself to the point where you can just kill the damn thing (because doing so is impossible, at least by the terms of the game world).
 * Fire Emblem: Path of Radiance alone uses the trope straight, with the characters believing that Lehran's Medallion contained an evil god that flooded the entire world save Tellius. So at the end they not only the heroes fight Ashnard in order to liberate Crimea, but also to prevent him from unleashing a dark god.
 * Genealogy of the Holy War wins "strangest method of resurrecting", with 2 half siblings being brainwashed in order to breed a vassal for the dark god they are descended from.
 * Dwarf Fortress has what is popularly referred to in the community as "Hidden Fun Stuff".
 * As of the latest update
 * In Age of Mythology the cyclops Gargarensis is on a mission to free Kronos from Tartarus in return for godhood.
 * In Metroid Prime: Hunters, "the ultimate power" broadcast in a telepathic message throughout the galaxy is actually  This is one of the few cases where the good (the Alimbics) weren't strong enough to kill the evil, just entangle its energy with theirs in the Seal Sphere and hide it in a pocket dimension.
 * The titular creature from the first Metroid Prime game was sealed within he impact crater. In the original version, the Space Pirates managed to free it by digging under the seal, although it later escaped from them and returned to the crater, and you have to open the seal to fight it. In the European release/Player's Choise version, it was never released.
 * Legend of Kyrandia III: Malcolm's Revenge has the player play as a Sealed Evil in a Can, who is rather dismayed to discover that being unsealed does not include getting his awesome magical powers of doom back, leaving him running around with no powers in a fantasy kingdom where pretty much everyone hates his guts.
 * Averted and parodied in Septerra Core. The game's intro movie and backstory tell about a great battle in which Marduk (the world's Crystal Dragon Jesus) defeated Gemma (the local Satan equivalent). In most RPGs, at some point towards the end Gemma would be resurrected and become the final boss. The main character even speculates that this is going to happen after hearing the tale about the battle between Marduk and Gemma. In response, The Obi-Wan remarks that such a plot twist would be rather silly, and only happens in stories. Sure enough, Gemma never comes back, and the final boss of the game is the character who's been the main villain from start to finish, the Knight Templar Evil Overlord Lord Doskias.
 * Gig from Soul Nomad and The World Eaters starts the game as an example of this... and in a subversion of this trope, unless you actively start asking for his 'help', he's rather harmless, if a bit foul-mouthed.
 * Phantom Brave features an example as the main antagonist, the demon Sulfur. Rather than the usual thousands of years of imprisonment though Sulfur is capable of coming back every thirty years, and even during his imprisonment is capable of extending enough influence into the world to wreak havoc.
 * Parodied in Makai Kingdom as Zetta seals himself in a book after he destroys his own netherworld. Hilarity Ensues as he tries to get his body back.
 * All games in the Ys series use this trope, e.g. Darm in I and II (who was disguised as the Black Pearl, also an Artifact of Doom), Galbalan in III, the Ancient City and Arrem in IV, the lost city of Kefin and its king, Jabir, in V, and the Ark of Napishtim in VI.
 * In the Infocom text game Enchanter, your job is to defeat the evil enchanter Krill without disturbing the Cosmic Horror that's sealed below his castle. The tie-in novel by Robin Bailey takes the tack that your character accidentally did release the thing, and now it's up to the book's protagonist to stop it.
 * The City of Villains is practically filled with these: ... and the City of Heroes isn't lacking in them either, as Dark Astoria apparently houses the sleeping dread god of the Banished Pantheon, and the Kaiju that may still be in battle with Talos underneath Talos Island... Also, both sides can get involved in the escape of the Reichsman, Nazi with the power of the gods.
 * Marathon Infinity starts out with a grim message from Durandal about the W'rkcacnter getting loose from Lh'owon's sun, due to the Pfhor using . The W'rkcacnter cannot be fought directly, and is only defeated by.
 * In Pathways into Darkness, the Marathon games predecessor, a modern-day Special Forces team must prevent a W'rkcacnter from escaping from its can.
 * Speaking of Bungie, the main plot of Myth: The Fallen Lords is this, and it's reanimating corpses and whatnot. After you all but lose the war, you manage to kill it.
 * A more literal example is The Watcher, a powerful Lich who was imprisoned in a cave by a charm on his hand that would turn him to stone if he tried to leave. Ultimately, he chose to cut that hand off. He finally met his doom when an arrow was fashioned from the bone of the hand that was left behind and turned him to stone after striking him.
 * They also smashed his stone form into rubble just to be sure.
 * In Dead Space, the Marker seals the infection that turns corpses into horrific alien monsters . Anyways, the Marker-Worshipping Scientologists Unitologists discover the Marker in the midst of mining Aegis VII and move it off its pedestal. Bad things occur.
 * The hook and most the line of Arcanum's plot involved the player character being a Chosen One prophecied to defeat a Big Bad, last known to be sealed in a can. Later it's revealed that many evils are sealed in that can, and by the time you finally wormhole your way inside,
 * of Mega Man X, with The Virus originally coming from him.
 * The "can" in question is in itself a Sealed Evil,.
 * Wario Land games have had a few cases of this, with Wario Land 3 having Wario spend half the game trying to 'help' a mysterious figure trapped in the music box, who turns out to be Rudy the Clown, which then tries to take over the world. Wario World had him accidentally unleash the sealed evil in a can at the very beginning, aka the Black Jewel, which was taken from some kind of treasure chest by Wario and his obsession with treasure, and that then turned his entire castle into a parallel dimension of sorts and what not.
 * Jedi Academy: The sealed evil takes the form of an ancient Sith Lord, whom the game's big bad is naturally trying to resurrect, thinking she will be rewarded. The Sith Lord has other ideas.
 * Earthbound: Giygas is first encountered in the Devil's Machine, which seals away his warped consciousness. Subverted in that Giygas can still damage Ness and his friends while sealed away, but played straight when Pokey unleashes Giygas' true form by turning the machine off.
 * Mother 3: When his mech runs out of power,.
 * In what is possibly the worst-sealed can ever, Pac-Man. He kills the ghost, sealing it in the little box in the center of the screen. Three minutes later, it escapes again, and poor Pac must kill it over again. Perhaps he'd have better luck if he gave his little ghostbox a lid.
 * Well before the start of the Geneforge series, the Shapers discovered a startling new technology that could imbue ordinary humans with incredible magical powers. When they discovered some of the side effects involved (such as Suicidal Overconfidence, a violent temper, and in extreme cases, outright Body Horror), rather than take any steps to destroy this technology, they simply abandoned the remote island outpost where it was discovered, and declared it off limits under penalty of death. Fast forward a few hundred years: A band of explorers from across the seas happens upon the abandoned outpost and all its forbidden goods. Things go downhill from there.
 * In fact, the Shapers do this constantly. Their laboratories, workshops, and schools are designed to be sealed up quickly should anything Go Horribly Wrong.
 * Not just should. It's said at one point that more often than not something does go wrong.
 * Dragon Quest V has Bjorn the Behemoose.
 * Dragon Quest VIII has Rhapthorne, with two cans: the scepter of Trodain to hold his soul, and to hold his body.
 * In Planescape: Torment,.
 * In Romancing SaGa: Minstrel Song, the god Saruin was sealed away via the Fatestones; naturally, his minions are trying to 'correct' this. However, an even better example is : a monster poised to destroy a whole country if awakened. Even if the player manages to delay its awakening -- no easy feat by itself, given the precise timing and difficult sequence of events that involves -- they can't stop it unless they enter its lair while it's still sleeping. And even then it's one of the harder fights in the game.
 * Orochi in Okami is a definite example of this trope.
 * Big Bad of Super Robot Wars K, Lu Cobol was defeated by the Crusian. They decide to hid Lu Cobol's fragments in planets across galaxy. 2,000 years has pass and now bodiless Lu Cobol seek to reform itself, by destroy whatever planet that hold its fragments.
 * In Phantasy Star 1, 2, -and- 3, you find the big bad end boss Dark Force/Dark Falz/Dark Phallus (depending on translation) in a literal Pandora's Box in the final dungeon.
 * Earth 2160 has the traditional sealed-ancient-evil-alien-race-beneath-the-surface-of-Mars for the first half of the game. Then some Dutch nerd learns to control them, and it all ends badly(-er).
 * Lavos in Chrono Trigger.
 * A subversion, Lavos was an alien that burrowed into the earth and then unleashes the apocalypse many ages later as part of its natural life cycle. Essentially, it seals itself in the final can and breaks out when it wants. The villains of the game attempt to awaken him to harvest his power, with the apocalypse being a byproduct of this.
 * In the Lucas Arts computer game LOOM, Bishop Mandible unleashes Chaos by ripping open the fabric of the universe near a graveyard.
 * The  in Clive Barker's Jericho.
 * In Prototype,  is sealed in the Genetek building. Badly. The protagonist might also count as a Sealed Evil In A Can, although in this case it's more like.
 * Vampire: The Masquerade Bloodlines features a memorable subversion -- the MacGuffin of the game is a sarcophagus that supposedly contains an Antediluvian (very old, very powerful vampire). Everyone is trying to make a move for the sarcophagus, partially because the presence of such a thing might be a herald of Gehenna -- but also because a low-generation vampire represents a massive power grab for anyone willing to commit diablerie (the consumption of another vampire's soul). Well, the Prince has been pushing you around all game in an attempt to claim the sarcophagus, and when it's finally opened...
 * The Dark Star from Mario & Luigi: Bowser's Inside Story. It was imprisoned in Toad Tunnels (possibly due to the threat it posed when Smithy used it, lol, he uses an attack called Dark Star in Super Mario RPG that is the most devastating attack) until it is released by Fawful.
 * In Mario & Luigi: Partners In Time,
 * Rudy the Clown in Wario Land 3. He was manipulating Wario into releasing him from his prison for the entire game, then turns on Wario when he's free again for the final boss battle.
 * Similarly, possibly the entirety of the Golden Pyramid in Wario Land 4, and the Black Jewel in Wario World.
 * The demons in Doom 3. Sealed in a can until . They were sealed back into the same can at the end, as well...
 * Heinrich I, in Return to Castle Wolfenstein. Doubly so, given ...
 * In Borderlands, the Vault . Sadly, . The Vault also opens every 200 years, which raises the question of it really is a sealed can.
 * Malefor, aka The Dark Master from The Legend of Spyro series.
 * Also, the Destroyer counts, as its sole purpose for existing is to destroy the world but it slept below a volcano until Malefor awakened it to destroy the world. A rare case of one Sealed Evil In A Can freeing another.
 * In the Touhou game Perfect Cherry Blossom the evil cherry tree, the Saigyou Ayakashi, is sealed up by the dead body of Yuyuko Saigyouji. At the same time, the tree seals her, preventing her from reincarnating, so she wanders as a ghost. In a wierd twist, Yuyuko eventually forgets her life as a human, up to and including why she died or who is sealed beneath the Saigyou Ayakashi. This leads to her trying to ''undo' the seal that she placed in the first place, because she forgot she did it.
 * The player characters in Undefined Fantastic Object think that the incident is releasing one of these, however Byakuren is very much a Sealed Good in a Can.
 * From the perspective of the Buddhists, the Taoists in Ten Desires are this, what with that whole religious war thing. As usual for Touhou they aren't evil, but neither are they particularly good.
 * seems to be the case with the  in Klonoa 2: Lunatea's Veil.
 * The Devil May Cry series. Every. Single. Installment. ...except the fourth. That one just needed to be awakened rather than unsealed.
 * The draconic Old Gods of the Tevinter Imperium in Dragon Age: Origins were, according to the Chantry, banished to the depths of the earth by The Maker to slumber for all eternity. The Darkspawn are somehow able to hear the Old Gods' Call and devote centuries of effort tunneling through the earth in search of them. When they finally discover an Old God, the Darkspawn taint immediately corrupts the ancient dragon, turning it into an insane and twisted shell of its former self -- an Archdemon. The new Archdemon then commands the Darkspawn hordes in a bid to kill everything -- a Blight. By the time the game starts, the world has already suffered through four such Blights..
 * In Resident Evil 4, the parasitic Las Plagas were sealed away for eight generations before the start of the game.
 * Arcanum: Of Steamworks and Magick Obscura has the void, an alternate dimension where the Elven Council banished 5 Evil beings: A demon with insatiable hunger, the murderer who killed Arcanum's last dragon, a genocidal barbarian king, and two corrupt wizards.
 * Akron, the Final Boss of Epic Battle Fantasy 3. He notes in his Boss Banter that he has been defeated and sealed away countless times through time immemorial -- but in the end, his enemies all succumbed to time while he always returns.
 * Greed from Dubloon.
 * Shivers has the Ixupi, ancient soul-sucking Mayincatec demons who were sealed into pots with talismans. Millenia later, an itinerant archaeologist digs them up and puts them in a museum. Then two kids sneak in the museum and break them open.
 * Return to Krondor presents the Dark God as this. The Dark God does not get released, but the ending makes it clear that the person trying to unseal it has not given up.
 * Daglathor in Warriors of Might and Magic is sealed inside a dungeon in the heart of a mountain. And the mechanism to avoid his eventual escape is found... inside his prison.
 * Might and Magic VII has a rather simplistic sealing liable to be done by the player characters: the medusa crawling around in the sub-level of an abandoned mine have developed an immunity to magic. As a class promotion quest, you get sent to sabotage the elevator to keep them down there.
 * The demon in Phantasmagoria.
 * A significant portion of the plot of Brave Fencer Musashi revolves around this. The first major quest in the game involves Musashi being sent to collect Lumina, the legendary greatsword used to defeat the Wizard of Darkness; a significant portion of the rest of the game revolves around Musashi questing to recover the elemental Scrolls in order to power Lumina up enough to take out the Thirstquencher Empire.
 * Fate Stay Night has the  was corrupted as of the   by the Anthropomorphic Personification of evil.
 * Lightning Legend Daigo no Daibouken has Dragless, a legendary and all-powerful Demon King who rampaged through the Kingdom of Japone 450 years before the story's proper, destroying everything on his way. He ultimately was defeated and sealed away in the deepest ends of Mt. Ohsore by the young hero Taikei Raioh, but by the start of the game he has finally freed himself, and it's now up to the descendant of Taikei, Daigo, to defeat him for good.
 * Played with in Dragon Age.
 * In Dragon Age II Hawke can fight several powerful demons that were sealed away in and around Kirkwall. The "Legacy" DLC revolves around the Hawke family's connection to an ancient Sealed Evil In A Can whose subconscious efforts to free itself have brought danger to Hawke's doorstep.
 * The Antarans from Master of Orion 2: Battle at Antares. They are an ancient and powerful race who were banished to another dimension by the Orion Empire. However, they learned how to break out of their prison and were able to warp raiding parties to attack colonized worlds while preventing others from invading their prison-turned-stronghold. Nice job breaking it, Orion.
 * The Dread Lords from Galactic Civilizations 2. The Dread Lords had a pocket dimension which they had used as a base for their fleets. Their enemies, The Arnor, used this against them by sealing the last of their empire in the dimension. Later on, the Dregin found the lock to the Dread Lord prison. Thinking that is was an ancient weapon, they activate the device, allowing the Dread Lords to escape and wreak havoc across the galaxy. Upon seeing this, the Drengin realize their mistake and decide to leave the others for dead.
 * The Soulless Gods of Lusternia. Originally a host of thousands of abominations, they're whittled down to a mere five before The Elder Gods fled to the Void. Rendered Load-Bearing Bosses by devouring whole sections of reality, they're eventually sealed away by the Council of the Nine. Unfortunately, the cans in question are legendarily insecure - one of the five breaks out like clockwork every thirty years.
 * In Valis II, Cruel King Megas had been sealed away long ago, but was released when rebels battling the forces of the fallen Lord Rogles broke the seal and opened the Forbidden Door. The result was to turn Vecanty into Hell on Earth.
 * The entire Arc the Lad series revolves around this trope with the Dark One. He starts every game being sealed, winds up being unsealed at some point, and then gets re-sealed by the end of the game.
 * Ogre, Jinpachi, and Azazel of the Tekken games.
 * The demon of the first Ninja Gaiden game, and the Archfiend of Ninja Gaiden: Dragon Sword.
 * Seems to be somewhat of a recurring theme in the Shining Series. Evil guys try to unseal something worse;
 * In Shining Force, Darksol's evil plan is to unseal Dark Dragon.
 * Shining Force III's overall plot is about a secret cult reactivating ancient weapons to create enough chaos to allow the Vandals to return.
 * Shining the Holy Ark is all about how a group of low powered Vandals want to release one of the most powerful Vandals ever; so he can recreate the 1000 Year Kingdom.

Web Comics

 * Order of the Stick features The Snarl, a monster formed from tangles in the fabric of reality, and sealed within the world itself.
 * Also subverted with The Creature in the Darkness, who Xykon and Redcloak think should be evil and scary (and accordingly, they keep it locked in a box), but for the most part is just hungry and clueless, verging at times on Too Dumb to Live.
 * Charby the Vampirate had a big old can of evil, slightly subverted since it had originally been sealed by an amaturish effort to defeat it, only to reseal it with a tighter lid later after it got loose. Of course we didn't learn that evil came in cans until after the fact.
 * Subverted in Eight Bit Theater. Red Mage places the fire demon Kary in a Bag of Holding and freezes it with a powerful Ice spell, with the idea that she will remain sealed until they are powerful enough to defeat her. White Mage simply smashes the frozen bag.
 * In The Inexplicable Adventures of Bob, space villain Fructose Riboflavin gets turned into Pure Energy and stuffed into a battery. He doesn't stay there for long, though.
 * Mr Goh has rather a... literal... approach to this trope.
 * On sale in theGift Shop of Death in Neko the Kitty
 * In Girl Genius, the Other is a being of such extreme evil that it wants to enslave the world... and doesn't really care who dies in the process. It was eventually defeated, but nobody knows HOW... except maybe the parents and uncle of the protagonist.
 * Inverted in The Way of the Metagamer: the evil is sealed within the Book, and does not escape... but the heroes are forced to follow it into the Book.
 * The Axe of Prissan in Goblins acts as a prison for an immensely powerful demon lord, whose very existence threatened the mortal plane. The enchantments binding the prison will gradually break down if the axe is not used for good, or even faster if used for evil. As such, it has enchantments layered on it to ensure it will aid any paladin who encounters it and refresh the prison.
 * Umbria/Zaedalkaah from Our Little Adventure, who was blindly released by the heroine.
 * In The Adventures of Shan Shan, Julius is worried because the sealed evils have managed to touch the physical dimension.

Web Original

 * Many, many things contained by the SCP Foundation. One, SCP-076-2, had the particularity of coming with his own (leaky) can, SCP-076-1, and the SCP (after many Pyrrhic Victories keeping it in the can) eventually decided to try and work with him; predictably, it didn't end well.
 * SCP-231-7 is the can for...whatever Endofthe World As We Know It entity it is that she carries. And the Foundation has to do some horrible stuff to keep it in there. Trust us, You Do NOT Want to Know.
 * Neopets now has its very own Sealed Evil In A Can, as of the end of the Return of Dr. Sloth plot event that happened January 29 - March 15, 2008. The comic is here, and spoilers are here:
 * This Uncyclopedia article lapses into this trope in the last two sections, in a hilariously meta way.
 * Dagon, a world-threatening evil sorcerer from the Global Guardians PBEM Universe started out as an primordial god trapped in a mystic prison until accidentally released by a human gangster. One body-warping soul-merge later and the gangster's mind is gone and Dagon is loose on the Earth to fulfill prophecy by destroying the planet.
 * BEN of Ben Drowned is within a Majora's Mask Nintendo 64 cateridge, though how he originally got inside is relatively unknown.
 * The Big Bad of the second year in The Questport Chronicles starts out as Sealed Evil in a Mirror.
 * Phantasia has more than one of these, of varying degrees of world-destroying power.

Western Animation

 * Trigon in season four of Teen Titans, where his daughter Raven becomes his portal into the world, allowing him to turn every creature in the biosphere into stone and cover the planet in lava.
 * Also, the dragon Malchior in an earlier episode qualifies, sealed in one of Raven's spellbooks.
 * Most seasons of Jackie Chan Adventures involved the cast attempting to reseal escaped Sealed Evil In A Can once using a jar-like object. In the series, this is justified by the fact that destroying evil will only allow a different (and probably stronger) evil to take its place. Better then to keep around the evil threat you already know how to deal with, than risk leaving the way open for something far worse to come up that you may not know how to deal with in time.
 * In other words, the devil you know is better than the one you don't.
 * The singing, dancing frog who ruined a man's life in the Looney Tunes short "One Froggy Evening" was placed into a cement slab and freed several hundred years in the future. The frog was also found by the man in question in that cement slab, so he may have been taken out of and put back into the slab many, many times by all the men whose lives he had ruined.
 * This is based on the story of a real (not evil) horned lizard that was sealed in the cornerstone of a courthouse (long before they were on any endangered species list). 31 years later the stone was opened and the horned lizard was alive and lived on for almost a year afterward.
 * Monster Allergy has this when it comes to trapping monsters.
 * Wu-Ya from Xiaolin Showdown was trapped in a puzzle box for 1,500 years until Jack Spicer freed her unwittingly.
 * Likewise, Hannibal Roy Bean was trapped in the Yin-Yang world for nearly as long until Omi freed him unwittingly.
 * And then there's Sibini, who was trapped in the Mosaic Scale until The Evil Within.
 * Danny Phantom has both Pariah Dark and the future self of the titular character.
 * Also the Fright Knight, released first by Danny himself (accidently), and later by Pariah Dark so that he could act as The Dragon.
 * The Dark One from Super Robot Monkey Team Hyperforce Go!, who is so large he requires an entire planet for a functioning seal.
 * Please see the "Exaggerated" example for further details.
 * Legion of Super Heroes, "Phantoms": Due to Time Travel, Superman accidentally unseals an evil that, it's implied, his future self sealed/will seal a thousand years beforehand.
 * Vilgax, from Ben 10, tends to be put in a can of whatever sort between appearances, be it a healing chamber, a block of ice, or a pocket dimension. He's slightly unusual in that we see him out of the can first.
 * And in the same show, Ghostfreak is an odd example of evil that got sealed in a can accidentally, his DNA sampled for the show's Clingy MacGuffin so that the wearer can turn into him, and the personalities of his species being encoded in their genes somehow. Eventually, he gets loose and becomes Ben's Enemy Without.
 * Aku in Samurai Jack.
 * The three servants of Seth.
 * Hades, Greek God of the Underworld, in Justice League. Released by Felix Faust in the hopes that Hades will grant him "ultimate knowledge" in return. Hades naturally betrays Faust by
 * The 13 Ghosts from the Chest of Demons in The 13 Ghosts of Scooby Doo.
 * In the prequel episode of Code Lyoko, we discover that the dormant Supercomputer was basically sealing XANA for ten years. It is Jérémie, by turning it back on, who unleashed the malevolent program (plus his future girlfriend) on the world.
 * The Care Bears Movie had the Evil Spirit, whose can was a locked book of magic spells a young boy, Nicholas, opened. The spirit is powerful but, since it's confined to the book, needs Nicholas to cast its spells; he becomes progressively more evil in the process. The Power of Friendship helps him come to his senses and he helps close and relock the book, ending the threat.
 * In Animaniacs, the Warner Brothers (and their sister Dot) were Sealed Zany in a Water Tower. In this case, it was more Sealed Chaos in a Can.
 * Kim Possible had some sort of a sealed evil monkey man who petrified people in one episode.
 * Transformers had a lot of these.
 * For 4 million years, the Ark held the Decepticons and Autobots in stasis, under a volcano... until volcanic activity shook things up and woke up the evil Decepticons.
 * In Cosmic Rust, there's a dead planet with radio beacons warning travelers to stay away or die horribly. The Decepticons plunder it, and in the process, catch the metal-eating plague called Cosmic Rust.
 * Starscream shows signs of Tabletop RPG Genre Savvy in this episode: when confronted with a sealed crypt with a curse warning on it, he proclaims that "a curse on the door means treasure behind the door" and breaks in. Unfortunately, he's in a Transformers cartoon, not a D&D game, making it a near-fatal case of Wrong Genre Savvy.
 * In Return of Optimus Prime, the Hate Plague spores were sealed inside a star after their last outbreak. Unfortunately, the star went nova.
 * Starscream himself could be considered Sealed Evil in a Can in the episode Starscream's Ghost; his ghost first appears after Octane tumbles into the Decepticon crypt and knocks over the ruins of Starscream's grave marker.
 * Beast Wars brought us Protoform X a.k.a. Rampage. He was the result of Maximal experiments to produce an immortal super-soldier by copying Starscream's mutant spark. They got that part right in the form of an unkillable serial killer that slaughtered human and cybertronian alike. After eventually capturing him, the Maximal Elders sealed in up in a stasis pod then turned him over to Optimus Primal's to dump on some desolate asteroid since they could figure out how to destroy him. Several adventures later and the monster was unleashed again and recruited by the Predacons.
 * Deconstructed in Transformers Prime.
 * In Di-Gata Defenders the plot of the first season is for the titular Defenders to reseal an obscenely powerful entity known as the Megalith that the seasons' Big Bad used to take over most of the world a generation ago. However, the defenders decide on a change of tactics after finding out that not only has this thing been sealed and escaped numerous times in the past, but that it gets better at unsealing itself each time.
 * On a side note the Megalith
 * Swat Kats: In the first episode, the Pastmaster is Sealed Evil in a Treasure Chest. We don't learn he exists until after he gets unsealed.
 * There's also the Mad Kat The Insane Jester, who was sealed in a jack in the box.
 * Felidae's Claudandus literally means "something that must be sealed".
 * The Real Ghostbusters played with this trope on occasion, notably in the episode "Knock, Knock". They even played with Chthulu in one episode.
 * The Sequel Series Extreme Ghostbusters also used this trope a few times.
 * Taken literally with Barom Mordo in The Superhero Squad Show, where he is sealed within a soda can... that Thor opens when raiding Dr. Strange's refrigerator for a late-night snack.
 * In an episode of Sonic the Hedgehog, Robotnik steals a computer of magic spells from the formerly evil wizard Lazar, and Sonic attempts to get it back. When asked why he can't just destroy the computer, Lazar says that would release all the evil it contains.
 * Norm the Genie in The Fairly Odd Parents.
 * Valtor from Winx Club may count as sealed evil in a block of ice, until the Trix released him in the beginning of season three.
 * The position of Phobos and several of his most powerful minions for most of the second season of WITCH . Nerissa was also once a Sealed Evil In A Can, but she escaped several decades before the series begins.
 * Buzz Lightyear of Star Command had Natron the First in the aptly named episode "Ancient Evil". After he is defeated and returned to his tomb, Mira melts the door to it. Hopefully this will keep him sealed.
 * Chiros, the secondary antagonist of Kong the Animated Series. Imprisoned in a stone tablet that is implied, by Harpy cautioning the gargoyles moving it, would turn out bad for Chiros if it was broken (whether it will actually kill him or simply prevent him from being released ever again is unknown). It is also unknown why it was never destroyed the first time he was sealed inside it. At the end,
 * My Little Pony Friendship Is Magic has The Mare in the Moon, a corrupted princess who reigned over the night, but turned evil when she saw how little the night was appreciated. She refused to let the sun rise, so her sister used the Elements of Harmony to banish her to the moon. But the legends state that on the longest day of the thousandth year, the stars will aid in her escape...
 * The villain of the first two episodes of season two, Discord -- the evil Spirit Of Disharmony who ruled Equestria as a land of chaos and suffering -- was trapped in a stone prison over 1000 years ago by Princesses Celestia and Luna using the Elements Of Harmony. After they lost their link to the Elements Of Harmony, the seal keeping him imprisoned began to break, and finally a little bit of chaos happening right next to it (thanks to the Cutie Mark Crusaders getting in a fight) gave him the strength to escape and begin his reign of chaos and disharmony anew.
 * "It's About Time" reveals that there're a bunch of these things sealed away in Tartarus that are guarded by Cerberus.
 * In The Godzilla Power Hour, the Cyclops was so invulnerable that even the Sufficiently Advanced aliens who discovered it couldn't destroy it, so they trapped it on an island behind an impenetrable force field. The sucker's so tough, even Godzilla doesn't successfully destroy it at the end, so the crew just ends up trapping it back behind its force field.
 * Simon and Snarf in Trollz; while the Magic of the Five was sufficient to release Snarf, Simon had to trick the girls into helping him, as he could only be freed by someone pure of heart helping him of their own free will.
 * In Adventure Time, Marceline's father, the Lord Of Evil, is sealed in the Nightosphere. Finn frees him, not knowing how evil he was. In the end, Finn manages to seal hime back into the Nightosphere. Even worse is the Lich, the Ultimate Evil who was imprisoned inside amber within a great tree by the legendary hero Billy. He finally broke free during the season 2 finale.
 * The Red Sentients in Hot Wheels Battle Force 5. They were sealed away in five seperate Battle Zones by Zemerick when he betrayed them. At the end of season 2, Krytus is freed by a traitor named Praxion (whom he promptly drops off a cliff) and proceeds to release the rest of his team from their own prisons. The rest of the Red Sentients were all frozen by Sage before they could join Krytus in his multiversal conquest.
 * In an episode of Alfred J Kwak, Alfred encounters the Evil Spirit of Darkness, an ancient demon who caused so much torment and destruction that God locked him inside a magic bottle.
 * The snakes in Ninjago.

Real Life

 * Prisons.
 * Yucca Mountain Repository is a giant storage facility for nuclear waste. As much of the waste has half-lives long enough to still be pretty dangerous after 10,000 years, a lot of research has been done into the subject of how to do Sealed Evil In A Can correctly. For instance, the stability of the landscape needs to be taken into consideration; in 10,000 years, this part of Nevada might not be a desert. With a higher water table, the waste could leak. Language is also an issue, as languages are dynamically changing (consider the difference between Old Engish and modern English), a sign saying "Warning: horrible death lies within" might simply be inviting disaster. (Suppose an archaeologist comes across a big structure of a dead civilization. It looks like a tomb, and it's got "Warning: Horrible curse on all who enter!" written on it, and without understanding what it means, may lead to trouble). The Waste Isolation Pilot Plant project has been, for almost two decades, discussing with anthropologists and psychologists how to make it clear to people who may not even speak anything resembling our language thousands of years in the future that digging in the area will lead to mass amounts of death and suffering. They're well aware that whatever they do is going to be Schmuck Bait, and are taking steps to minimise it by making the entire thing instinctively look like somewhere you don't want to be.

Finally, Yucca Mountain has been abandoned for these very reasons. Deciding that we don't know how to seal the evil away for long enough, the official decision has been to seal it away in containers designed to last only 100 years, and let our descendants worry about re-sealing it. We are now officially Neglectful Precursors, unless it's Fridge Brilliance. A thing we have to reseal every hundred years is not going to be forgotten as easily. Like a story passed down from generation to generation, so long as it keeps getting told. Any disaster big enough to make us forget would be big enough that it probably wouldn't matter if the cache leaked.
 * Napoleon on Elba; one theory is that they actually wanted to keep Napoleon close just in case they needed to call on his talents in the event of another potential world-conquerer starting trouble. He just didn't like being the pet general in a box and decided to retake France.
 * Smallpox -- live samples are kept in a couple places around the world.
 * Two places, officially: The CDC in the United States, and its Russian cousin VECTOR. Some Russian scientist have supplied information that may indicate the existance of smallpox elsewhere, however, making this particular can possibly opened.
 * The sarcophagus that currently entombs the exploded nuclear reactor at the Chernobyl power plant was built hastily and nobody intended it to be a long-term solution, so it quickly deteriorated and is presently in terrible shape. Yet it's still the only thing that separates the reactor structure, with all of its highly radioactive dust and materials, from the outside world.
 * They are building a bigger and better can around it Real Soon Now.
 * Some say that Shi Huangdi's tomb is this.
 * To be more specific, the Emperor had a scale model of (his) China built within his tomb. In place of water, historians wrote that the builders manufactured gallons upon gallons of mercury to be poured into the riverbeds and ocean, so that Shi Huangdi's sarcophagus, which was built as a dragonboat made out of copper, could sail around in for all eternity. That one can not enter the tomb without succumbing to deadly mercury vapors strongly supports the historians' accounts.
 * The Goiânia Accident: In 1987, a medical imaging company in Brazil had relocated to a new office and had left behind one of their teletherapy machines. The building was demolished, but the machine was still intact. Years later, two scavengers broke into the site looking for scrap metal to sell. They found the machine and broke it open, releasing the highly radioactive Cesium-137 from its lead container. They mistook the glowing blue powder for carnival glitter; allowing their children to play with it and spreading it around their homes and farms for good luck. The symptoms of radiation sickness were misdiagnosed as food poisoning. In total, 249 people were contaminated, with 129 suffering internal contamination from ingesting radioactive material. Four people died from whole body irradiation.
 * Any chronic health disorder that can be temporarily held at bay by medical treatment.