Evil All Along

The hero is searching for a very special treasure. Too bad he doesn't know his way around. He meets a very nice person who offers to help the hero find the treasure. But wait, wasn't the temple supposed to be toward the south? Then why are you walking north? And why won't his guide answer his questions? And oh drat, there's the Big Bad. That "guide" was his minion, and thus evil all along.

Variation: If the guide turns out not to be just a minion, but the bad guy himself, he was the Big Bad all along. However, it may be that the Evil All Along was fake, and the person in question was Good All Along. It could also be that the person in question made a Heel Face Turn.

Compare and contrast Good All Along. Heel Face Turn might be an effect of this trope. See Hidden Evil for subtypes. Compare Big Bad Friend.

Since almost every example of this trope is a spoiler, expect OPEN SPOILERS!!!

Anime & Manga
""The Aizen you knew...never even existed.""
 * of Pandora Hearts.
 * Pokémon
 * This trope is used all the times in the anime, with Team Rocket always disguising themselves.
 * Other examples exist, like in the movie Pokémon Jirachi Wishmaker, where Butler seems like a good guy, but is actually evil and tries to abuse Jirachi. He does make a Heel Face Turn, however.
 * And Domino from Pokémon Mewtwo Returns, who seems like a good-natured ditzy teenage girl but actually a mean, hyper-efficient Team Rocket operative who is working directly under Giovanni.
 * In Digimon Adventure 02, Ken was the evil Digimon emperor all along. This is made glaringly obvious from his first appearance onwards.
 * Kabuto from Naruto actually did manage to pull off the "helpful, harmless stranger" routine pretty well. From his personality, to his appearance there's very little to tip you off to his being a threat.
 * Blackbeard from One Piece encourages Luffy to continue to pursue his dreams after he is mocked by another pirate crew. This guy would go on to defeat Luffy's elder brother Ace, and hand him over to the World Government. Once his and Luffy's goals crossed over in Impel Down, he gloated about his in his face, provoking a small fight.
 * The anime version of Blue Dragon has one of these in the form of near the end of the series. Though it appears at first that it's just a simple Face Heel Turn, the characters try to fool themselves into thinking that. Evidence in the last episodes proves otherwise.
 * In chapter 50 of Mirai Nikki, Akise claims that.
 * In the last minutes of the final episode of Panty and Stocking With Garterbelt
 * from Hellsing (only in the manga).
 * Bleach
 * Aizen.


 * Rasati and Lillia's guardian in Elemental Gelade. He broadcasts it from a mile away, but Rasati doesn't seem to notice.
 * from Nabari no Ou.
 * from Nabari no Ou.

Films -- Animation

 * In Disney's Aladdin, Jafar was the bad guy all along. This is fairly obvious to the audience; the characters themselves find out the hard way when Jafar tries to have Aladdin murdered, then steals the lamp and takes over.
 * In Disney's Tarzan, in turns out Clayton was planning all along to capture and sell Tarzan's gorilla family.
 * Obviously, Ursula was it in Disney's version of The Little Mermaid, but that one was very much expected.
 * Scar in The Lion King was evil all along, he even killed his brother when he had the chance.
 * In the movie Ice Age, Diego is Evil All Along. He makes a Heel Face Turn however, and becomes a member of the crew in the sequels.
 * In the Kim Possible movie So The Drama, the boy for whom Kim falls turns out to be evil.
 * And a robot.
 * In Atlantis the Lost Empire, Rourke and the other mercenaries (basically, everyone on the expedition but Milo) were Evil All Along. Fortunately a Downer Ending is averted when everyone but Rourke and Helga do a Heel Face Turn.
 * from Shark Tale.
 * from Rango.
 * Toy Story
 * from Toy Story 2.
 * And from Toy Story 3.
 * Igor's Know Nothing Know It All mentor Dr. Glickenstein from Igor.

Films -- Live-Action

 * Indiana Jones
 * Used in Raiders of the Lost Ark, in which the guide at the beginning runs away with the treasure.
 * Neither Professor Jones Sr. or Jr. smelled the Honey Trap in The Last Crusade. Was anyone else surprised?
 * Also in Indiana Jones and The Kingdom of The Crystal Skull, Indy's friend
 * In Star Wars Episode III: Revenge of the Sith, Senator Palpatine turns out to be Darth Sidious, the head of the Sith. And he's been playing both the Republic and the Separatists, along with the Jedi, for complete schmucks. Of course this was not a surprise to anyone seeing as people knew he'll be the emperor.

Literature

 * Harry Potter
 * Subverted: it appears that was evil all along after . But then it turns out that.
 * A more straight example: Peter Pettigrew, a.k.a. Ron's pet rat Scabbers, who turns out to be the one who betrayed Harry's parents to Voldemort and concealed himself as a rat for 12 years, leaving his friend Sirus Black to receive the blame.
 * There's also the matter of Mad-Eye Moody in Harry Potter. Even though it's not really Mad-Eye, but Ax Crazy Barty Crouch Jr. impersonating him, it's still an Evil All Along situation.
 * Nicolae Carpathia in the Left Behind books, though nobody but the Tribulation Force and those who have once been in Nicolae's close circle of friends really know just how evil Nicolae is under the public persona he projected up to the midpoint of the Tribulation. After he is indwelt by Satan, Nicolae's façade slowly cracks and the public gets to see the true person underneath. Strangely, though, Jesus berated Nicolae in his The Reason You Suck Speech, saying to him that You Could Have Used Your Powers for Good, which became a point of contention for some readers.
 * In Jack Vance's The Gray Prince, the titular Prince was a childhood friend to heroine Schaine; and for most of the book she firmly keeps in mind that, whatever his present political views, he once saved her brother's life. And then it turns out he in fact hated their family to the point of deliberately allowing her brother to be horribly injured and only claimed credit for the deed later.
 * Played with, though not exactly subverted, in Brandon Sanderson's Warbreaker, as She is surprised, but  Best line:
 * The Dresden Files: in Changes turns out to be a Red Court infiltrator.

Live-Action TV

 * True Blood tends to do this a lot, especially with their Big Bad of the season. As it turned out, was just hiding behind his nice exterior while being a bloodthirsty sexist murderer, and in a more extreme example,  who turned out to be a freaking homicidal Maenad. Season three followed suit with the Faux Affably Evil  who quickly turns into a genocidal maniac, and season four arguably averts it by giving it's Big Bad  a bit of a Face Heel Turn. Or rather, it shows her Start of Darkness.
 * Played somewhat straight with Rev. Newlin (Jr.); although it was clear from the beginning on he was more than just another bigot, few viewers were expecting him to turn into a full-fledged villain who imprisons the protagonists and wants to burn another character to death. Given, no-one was expecting him to become
 * What about the fairies?
 * in Dollhouse. Turns out he was secretly the Big Bad all along and running a ridiculously complex Evil Plan with Echo and co. at the center. And he seemed like such a nice guy. Although he wasn't completely evil. He was more of a Well Intentioned Extremist in the end.
 * Cassidy in Veronica Mars: He starts by raping Veronica lying about it but he becomes truly evil in Season 2. He kills a bus full of his classmates, a witness could turn him in, and 3 people on a plane. This wasn't revealed until the finale but yes he was evil.

Radio

 * Several times in Dickensian parody Bleak Expectations, the person helping Pip Bin with his latest scheme, such as the engineer who Pip employed to build a sewage system under London, is blatantly his evil nemesis Mr Gently Benevolent (in that case planning to dig out the capital, float it across the Channel with hot air balloons and sell it to the French).

Video Games

 * In Dead or Alive: Dimensions Genra is revealed to be a manipulative and power-hungry man, willing to do anything to get revenge for playing second-fiddle to the main branch of the clan. and that his loyalty and honer is just a facade to hide it
 * In the part in Mario and Luigi: Partners in Time where Princess Peach gets a purple mushroom on her face -- it's not Peach. It was Princess Shroob the whole time, trying to take over the future castle.
 * Fire Emblem
 * In Fire Emblem: The Sacred Stones, this happens to Lyon. Of course, everyone knows he's being devoured by the demon king, but that doesn't stop the main characters from believing he's still good.
 * Lyon is an interesting case where he actually invokes this trope to get Ephraim motivated to kill him so that he could die before the Demon King brings about the end of the world. He claims that all of their time they spent together as children he was pumping the siblings for information for the invasion of their kingdom just to make Ephraim angry enough to actually kill him.
 * Also, Orson appears to be evil all along too, but unlike Lyon, you can actually play him as a character. Later he appears as a boss.
 * In Another Code for the DS, Ashley's father's old coworker was evil all along, having killed Ashley's mother and stuff.
 * Eternal Darkness: At the start of Lindsey's chapter, a friendly patron by the name of Paul Augustine leads him to the Cambodian temple where Mantorok is entombed. Then it turns out that Augustine was actually Pious using an illusion spell.
 * In the Nintendo DS version of Drawn to Life: The Next Chapter, you get a new Raposa to join the gang, named Sock. You find him in a town where he doesn't live, and he goes with you to find his real home. Well, you're supposed to believe that. Near the end of the game Sock asks for a valuable item, gets it from Jowee, and throws it away. He then appears to be Wilfre all along. It also goes for Mari a bit, although she just thought she would help everyone by it (she worked with Wilfre).
 * In Pokémon Colosseum, the mayor of Phenac city is actually the head of Cipher. In Pokémon XD, the same goes for Mr. Verich.
 * In Pokémon Ranger an old man you help, named Gordon, is actually the head if the Go-Rock squad. In Pokémon Ranger: Shadows of Almia, a teacher in the ranger school, Mr. Kincaid, actually works for an evil organisation Team Dim Sun. Also The organisation Altru and their leader Blake Hall are evil, while you don't know that till the end of the game.
 * In the first two Professor Layton games, the antagonist Don Paolo disguises himself as other people. He's disguised as Inspector Chelmey in The Curious Village and as Flora in Pandora's box.
 * The mysterious wizard who occasionally helps you out in Final Fantasy Adventure is eventually revealed as Julius, who's been using you the entire time to get his hands on the girl and her Mana Pendant. Retconned out in the Sword of Mana remake.
 * In her Blaz Blue: Calamity Trigger story mode, Noel is accompanied by a mild-mannered pacifist intelligence officer named "Hazama." If you've seen trailers for Continuum Shift, you'll recognize him as Terumi, the Complete Monster behind the events of Calamity Trigger. What did he want from Noel? To Mind Rape her to take Nu-13's place as a living weapon of mass destruction.
 * Played with in Knights of the Old Republic, when it turns out that.
 * Maria in Silent Hill 2. To add insult to injury, you spend a lot of her "good guy" time trying to keep her alive.
 * In Paladins Quest, the student who goes with you to the forbidden tower on the academy grounds and goads you into accidentally freeing Dal Gren at the very beginning of the game is revealed at the end of it to be the Big Bad Evil Overlord Zaygos in disguise.
 * Kingdom Hearts: Ansem, the researcher who was studying The Heartless whose reports the player has been running all across the worlds to find. Turns out, he's the Big Bad and The Man Behind the Man.
 * In Bomberman 64,  presents himself as Bomberman's ally and even aids him in reaching Altair's fortress and battling its guardians only so that he could steal the Omni Cube from Altair and use its power to conquer the universe. When his plan succeeds, he thanks Bomberman by putting "Destroy Planet Bomber" first on his list of things to do.
 * We also have from Kirby Super Star & Ultra.
 * The Soda Poppers from Sam and Max Freelance Police want revenge in season 2 of the game series.
 * In OFF, intended to destroy the world all along.
 * in Tales of Monkey Island.
 * In the alternate timeline of Dead Rising 2: Off the Record, it's revealed that was the Big Bad all along. As soon as the reveal occurs.
 * Baten Kaitos
 * Eternal Wings and the Lost Ocean does a very unusual form of this.
 * Origins does a more standard version:
 * The Assassin's Creed II "Lost Archives" DLC reveals that
 * In Bioshock, this is part of the main plot twist that occurs about 2/3rds of the way through the game.
 * Happens practically Once Per Episode in the Dead Space series.
 * Ys SEVEN plays around with a lot of JRPG tropes. One of the major plot twists is that the Big Bad of the game is actually, of all people,
 * In Dead Island,  This is complicated even further in the single-player DLC where you actually play as Ryder White, and

Web Original

 * In The Gamers Alliance, several seemingly heroic characters such as Cain, Desdemona, Mordecai and Vaetris end up having been evil all along during the Godslayer era.

Western Animation

 * In Totally Spies, Terrance and Dean first seem like Dean was evil all along. Then Dean turned out to be good all along. The same goes for the episode in which Tim Scam was introduced. It also applies for a lot of "villains of the day".
 * In one episode of SpongeBob SquarePants, Plankton pretends he's going to help SpongeBob to become more assertive. He actually wanted everyone away from the beach, which all the viewers already knew.
 * In season two of Winx Club, the new teacher appears to be an evil impostor in the end.
 * Alpha Teens On Machines has an interesting example of this trope.
 * Joe Tabootie from Chalk Zone in season 2,3 & 4
 * The Angry Cop from The Goode Family episode "Gerold's Way or The Highway".
 * Gobsmack in Pearlie.
 * Vlad, the Russian teacher from Shuriken School was the main antagonist in the episode "Class Photo".
 * Peppermint Larry from ''The Marvelous Misadventures of Flapjack'.
 * and  from Tak and The Power of Juju.
 * In his first appearance on Kim Possible, Kim doesn't realize that Monkey Fist is a villain.
 * In season 2 of Wakfu, Qilby appears to be a friendly mentor to Yugo. He's actually an insane Omnicidal Maniac scheming to claim the Eliacube so he can go back to draining entire worlds of their wakfu.