Reset Button

"''"Do I dare ''Disturb the universe? ''In a minute there is time For decisions and revisions which a minute will reverse.""

- T. S. Eliot

The Reset Button is any means by which previously occurring drastic events are made partially or wholly irrelevant by the end of the story. This is very common to American TV shows both live-action and animated, particularly from The Sixties through The Nineties, because programming directors like to have the luxury of repeating episodes in any order or no particular order at all. It is also a prime way of enforcing Status Quo Is God.

Specific variants: All Just a Dream, Snap Back, and Filler. See also the Reset Button Ending, World-Healing Wave, Opening a Can of Clones and No Ontological Inertia.

Any Reset Button events in a Time Travel story are usually related to, or caused by, a Temporal Paradox. For when hits the Reset Button on a video game, see Bag of Spilling. When the player hits it, a lot, over and over, see Save Scumming.

Contrast with Here We Go Again. Not to be confused with the End of the World Special that concludes many anime series, in which much of the damage done in the series is reversed, but the main storylines either remain or become resolved. Can lead to a Story Reset often in such a way that parts of the story are rewritten at a later date.

One of the easiest ways to break An Aesop, as it makes depicting any consequences of misdeeds in an earlier episode impossible.

When a series heavily relies on Status Quo Is God, you can expect this trope to be used in some shape or form in order to avoid a continuity (which holds especially true for cartoons), sometimes Played for Laughs.

Anime and Manga

 * In Excel Saga, the Reset Button is actually a character: the Great Will of the Macrocosm, a floating vortex with arms. Her major purpose is to continually resurrect cast members as needed, which is quite often. Things get complicated when she not only fails to bring back Pedro, but starts sleeping with him. The Reset Button gets pressed at least four times in the first episode alone...
 * In the Dragon Ball series, the Dragon Balls are frequently used as a reset button for resurrecting dead characters, recreating destroyed planets, etc. Entire series are based on the concept of collecting all the Dragon Balls to undo the damage done in the previous arc. Unlike most Reset Buttons, this one actually has limits, especially early on when a specific wish can only be made once. The more powerful Namekian Dragon Balls didn't have this limit, though, and it was removed from the Earth Dragon Balls after . There's also a strict time limit, at least when it comes to resurrecting the dead: the wish has to be made within a year of the person's death. Which could have added complications given that the Dragon Balls spread across the world and become inert for a year after a wish is granted, and are completely untraceable until they reactivate.
 * In Sailor Moon, the title character twice serves as the embodiment of a reset button, at the end of the first and fifth seasons. Not only does she bring the entire main cast Back from the Dead in both cases, but in the first season, she also erases their memories (as well as her own) of being superheroes and saving the world, because she just wants to be normal. She is given her memories back in the very next episode, when a new enemy arrives.
 * She also acted as a reset button in the manga at the end of the Infinity Arc when she brought the entire planet back after Sailor Saturn killed everyone on it. Furthermore, she also acts as a universe wide reset button in the last chapter of the manga.
 * Code Geass essentially does this for its second season. Lelouch may know a little more about the details surrounding his mother's death, but those details The reset is also part of a Xanatos Roulette played by Charles Britannia to prevent Lelouch from meddling in his plans without killing him.
 * In the Love Hina anime, any time it seems there might be progression in the relationship between two characters (most usually Keitaro and Naru), an event will occur (typically Keitaro "accidentally" touching Naru's breasts with a consequent Megaton Punch making Keitaro A Twinkle in the Sky) to ensure that Status Quo Is God. Conversely, in the manga, Keitaro and Naru's relationship does progress (though occasionally in a "two steps forward, one step back" kind of way), and the Distant Finale shows their wedding day.
 * The Hinata Inn is more or less destroyed on several occasions, but always comes back.
 * Higurashi no Naku Koro ni starts most arcs as if the previous ones had never happened; this at first seems to be Negative Continuity but the first season's final arc implies something more is going on when Keiichi freaks out after suddenly remembering traumatic details from the very first arc. In the second season, we're introduced to the character that keeps pressing the Reset Button.
 * The Reset Button ending of My-HiME is often criticized for undoing much of the drama that unfolded in earlier episodes, as well as for "not really fitting the mood" of the series. May explain why the writers of Mai-Otome went with the Contractual Immortality route instead... well, except for that one character Killed Off for Real mid-series, thanks to the Really Dead Montage.
 * The end of Yu-Gi-Oh! GX's third season.
 * Miaka of Fushigi Yuugi uses her last wish to Suzaku so that the two worlds would return to normal.
 * Portions of the series Saitama Chainsaw Shoujo were rendered moot when
 * In The Wallflower manga, some progress has been made with Sunako and her unladylike behavior (she hardly ever gets nosebleeds anymore, for a start), but any development that would actually change the manga dynamic for good is reset. The most infuriating example of this is a late chapter in which Sunako finally realizes that she's beautiful and Kyohei finally seems to be having a Love Epiphany in regards to Sunako, only for all of that progress to be undone in the end thanks to a couple of thoughtless words from Kyohei.
 * The end of Magikano.
 * The Animated Music Video On Your Mark has one, around 04:34, when two of the main characters are about to die.
 * In the RS arc of Pokémon Special,  die in the battle, so Ruby whips out a   who brings them back.
 * The end of the 11eyes anime.
 * Seto no Hanayome. Nagasumi's house and school get destroyed on a regular basis, but always come back. Handwaved with the idea that Lunar's father owns a construction company.
 * In Mirai Nikki, Yukiteru Amano's sole reason to winning the game and becoming God is so he can wield the Reset Button and bring all his friends back to life.
 * The ending of the Fullmetal Alchemist manga was essentially a gigantic reset button for every event that happened in the finale. Such as
 * It /was/ that easy. The brothers just A. Couldn't get a Philosopher's Stone, and B. When they could they decided they didn't want to use it
 * In "Serial Experiments Lain", this is how  deals with rumors at school. Twice. It's unclear whether the events are erased, memories are erased, or whether  . See also.
 * Since the four "Inuyasha" movies are not entirely cannon, each includes a short scene after the credits that undoes anything that happened during the movie that might have been expected to affect the series. For example, in "The Castle Beyond the Looking Glass," the final scene  and the end scene of "Swords of an Honorable Ruler"
 * In End of Evangelion, humanity gets reset, with Shinji and Asuka as Adam and Eve. Maybe...
 * In the original, 1969 Himitsu no Akko-chan series, after meeting a new deaf kid, the heroine Akko-chan uses her magic mirror to wish herself deaf-mute and achieve a better understanding of his plight. However, when believing to have already gotten her Aesop Akko-chan tries to wish her hearing back, she finds out that, due to having wished herself deaf and mute, she no longer possesses the ability to communicate verbally, and the mirror refuses her wish. The Reset Button hits itself, restoring the heroine at her original state, only after the protagonist is scared into her right Aesop.
 * In Puella Magi Madoka Magica, Madoka uses her wish to
 * A lesser example occurs.
 * This is all too common in Naruto. The most blatant example is when Pain resurrects everyone he killed.
 * Subverted BRUTALLY in the case of Hidan.
 * Lampshaded in Sket Dance. In chapter 159, their wacky antics burns their club room down, and in the following chapter, when trying to explain themselves, Bossun and Himeko insists that it's a "gag manga" and that the room will surely return to normal in a week's time.

Comic Books

 * The end of Angel: After the Fall looks this way, until you realize that everyone in L.A. still remembers Hell A. Everyone knows that demons are real, everyone remembers seeing death or possibly actually dying, and everyone knows that Angel's a hero.
 * In the Dark Xena series by Dynamite, Gabrielle convinces a Cthullu type being to hit the reset button, causing everything to go back to the way it was before season 4 of Xena: Warrior Princess, but not without consequences....
 * The most thorough and brutal reset button ever seen was the end of the Clone Saga in Spider-Man. Over the course of the last decade, Peter Parker met a resurfaced clone of himself, got Mary Jane pregnant, suffered superpower outages, and gave up being Spider-Man to pursue family life. Everything actually seemed to be changing (some would argue for the better). Then in a four issue arc, Mary Jane was drugged and her baby was stolen, even though she thought she had miscarried (the child was never seen again). And Peter's clone was killed by Norman Osborne, who had been supposedly dead for thirty years! In one fell swoop, Peter was Spider-Man again, his clone was gone, his major villain was back, and he wasn't (to his knowledge) a father.
 * Continuing the theme of Spider-Man plot regression. Years later, Osborne taunted Peter by claiming to have kidnapped "May". Peter assumed that he meant his daughter (whom Osborne actually did kidnap), but discovered that his frail Aunt May had been a held a prisoner for nearly ten years, and not dead at all.
 * Yet another example occurred whenPeter rewrote the last twenty years of canon by making a deal with Mephisto. He gave up his marriage (and quite a few other historically established facts) to save his Aunt's life. It took a while, but the editors finally undid the last twenty years of stories.
 * Green Lantern: Rebirth and The Flash: Rebirth both do this by way of taking the old Silver Age stars of both series (Hal and Barry respectively) and putting them back into the starring role. Green Lantern in particular felt like this, due to the major Retcon of Parallax being necessary for it to work and bringing back the entire Green Lantern Corps.
 * James Robinson's 2 year+ World of New Krypton arc seemed to promise big and lasting changes for Superman. Kandor rescued from Brainiac and re-enlarged along with 80,000 Kryptonians (including Supergirl's parents). Superman leaving Earth, his wife and regular job to go live on the New Krypton they create. The destruction of the Phantom Zone and the release of all the prisoners it contained. Mon-El being cured of his lead poisoning. The return of Lois' father General Lane as a xenophobic human supremacist who commits some quite horrific war crimes against Superman's people, showing Kal/Clark that Earth isn't perhaps the home he thought it was. Lois being sacked from the Daily Planet. The death of Jimmy Olsen... All snapped back to the previous status quo in the over the course of the four issue War of the Supermen mini.
 * Entire plot reset in Freddy vs. Jason vs. Ash: Nightmare Warriors.
 * While Les Légendaires mostly adverts this trope (every story arc is at least once referenced later, and any change that happen will remain), there was at least one exception with the story arc in Book 5 and 6, involving the current villain Ceyderom travelling through time in order to prevent the Legendaries from ever existing. After all Legendaries but Jadina died trying to stop him, Jadina ends up seizing the time travelling machine, going back to a few week before Ceyderom found it and destroying, thus cancelling everything that has happened since the beginning of the story arc; apparently, even her forgot everything that has happened then. On the other hand, the arc made mention of part of the Legendaries' past, and introduced two characters (Prince Halan and Tenebris) who came back later.

Fan Works
"Spiderman: Wait. So, that's all Superman had to do? Batman: What do you mean? Spiderman: I mean, he just pressed the reset button, basically. I was kinda hoping for something, I don't know, a bit more... epic Batman: It's a perfectly plausible resolution. Spiderman: Yeah, but is it satisfying? Batman: It works within the boundaries of what was established. Spiderman: Yeah, but it takes all the excitement out of it if all you have to do is make it so that it never happened. Batman: No, that's only if it turns out to just be a dream or something. Spiderman: But you can't have drama without..."
 * Marvel/DC After Hours has some fun with it.

Films

 * The Michael Crichton film Sphere employed a Reset Button. The book's ending is left ambiguous enough that one can infer that the Reset Button attempt only made things worse, though The Film of the Book lacks this Karmic Twist Ending.
 * The movie Bewitched, which already didn't make much sense, employed a reset button about 2/3rds of the way through the movie that practically took the story back to the beginning again.
 * Galaxy Quest had a very limited Reset Button: the Omega 13 could turn time back thirteen seconds. Just barely enough time to fix a major mistake. Fortunately, it wasn't a plot reset button. The movie was way too good to try that.
 * The Russian movie Day Watch ends (thanks to a piece of miraculous chalk) with a huge reset of not just all of its events, but also those of the first movie (Night Watch). Though at least there are some developments right after that and some of the characters seem to retain the memories of the original timeline.
 * In the Superman films:
 * When Lois dies in the first film, our hero starts flying around the earth and goes back in time to save her. Because we see Superman flying around the Earth, which reverses its rotation as he flies faster and faster, most viewers interpreted this scene as Superman reversing the rotation of the Earth, which magically reverses time. It was supposed to represent Superman flying so fast that he flies through time and into the past. The Earth spinning backward is a visual representation of the reversal of time, much like the hands of a clock going backwards in other time-traveling scenes. In the comics, Superman sometimes travels through time by exceeding the speed of light. He even made us forget about the earthquake that killed Lois. What earthquake? Exactly.
 * Superman's time travel ends up freeing the Kryptonian villains in Richard Donner's [superior] cut of Superman II, forcing Supes to do the "backwards rotation" thing a second time to undo all the crap General Zod started (in fairness, this was supposed to be part II's ending from the get-go; it was moved to part I after Donner got canned).
 * The 1936 film The Man Who Could Work Miracles (based on an H.G. Wells book of the same name) employs a giant reset button. After stopping earth's rotation to make the day last forever and the Literal Genie trope operates with the effect of DESTROYING the entire surface. The main character decided he is only human after all - he wishes he'd never had his godlike powers and returns to the very beginning of the plot, minus the powers or memory he ever had them.
 * Subverted in Mystery Men:
 * The Jumanji board game; it's even there in the instructions.
 * Funny Games uses this in a highly literal sense.
 * Star Trek III the Search For Spock is one big honkin' Reset Button which effectively undoes every plot development from Star Trek II: The Wrath of Khan. And then...
 * Necessitated because of Leonard Nimoy's sudden about-face decision (after filming on II wrapped) to continue playing Spock after all. Thus was added to II the scene of Spock's ejected coffin coming to rest on the Genesis Planet, yielding the one, tenuous, improbable link between films to explain Spock's resurrection regeneration.
 * This wasn't so much a Reset Button, since Spock was highly changed after his resurrection; likewise, it was fairly obvious from Spock's mind-meld with McCoy before his death, that he was doing this for an upcoming reason—and it wasn't just so Spock's k'atra (i.e. soul) could be transerred to Vulcan. While the Genesis Device and Kirk's son were indeed removed as original plot-devices, the Genesis device remained as a new super-weapon, and became the driving basis of he plot behind Kruge's mission; meanwhile David Marcus's death became central to the plot of Star Trek VI, when this made Kirk decide that the only good Klingon was a dead one. No reset-button.
 * Also: the Enterprise was freakin' destroyed, and (as far as we knew at the end of the film,) the careers of the crew were in tatters—they'd be lucky to not go to prison for disobeying orders and stealing the ship. Certainly not status quo ante.
 * Because they saved Earth at the end of Star Trek IV their actions in III were disregarded, but Kirk lost his Admiral position. Not that he didn't mind.
 * Star Trek (2009) hits a reset button for the universe of a franchise (apart from the prequel series Enterprise, while explicitly invoking the MST3K Mantra as a fig-leaf
 * There was a type of reset-button used after Star Trek: The Motion Picture, when the events of the movie seemed to no longer exist as of Star Trek II. The Enterprise re-fit seemed greatly toned down from its awesome power shown, Spock no longer had his embrace of emotion gained in the movie, and events were now set 15 years in the future rather than 2-1/2. Word of God indicates that this due to a studio-decision to depart from the old ways and appeal to a broader audience with Star Wars-like sci-fi, hero-vs-villain, derring-do and metaphor, as opposed to the original formula of logic, hard science and futuristic optimism. This was visually demonstrated when Khan hoisted Checkov in a one-handed manner unmistakably reminiscent of Darth Vader doing the same to Captain Antilles... while indicating a similar turn of character.
 * Star Trek Generations used the Reset Button, via Picard's travelling back through the Nexus to before the star exploded, in order to bring back Kirk to help stop it from happening.
 * An unintentional aversion exists here, in that it's established early in the movie that Picard's brother and nephew recently died in a house fire causing Picard to break down in tears. Yet even when given the power to return to any point of time he doesn't even consider going back far enough to prevent his own blood relations' horrible firey death.
 * In 1972, in response to the politics of the animated film adaptation of his comic Fritz the Cat, Robert Crumb kills off Fritz. Two years later, Steve Krantz produces an animated sequel, The Nine Lives of Fritz the Cat.
 * Not used, but directly mentioned in Megamind. Apparently the main character stopped trying to make one after learning the science behind it was impossible.

Literature

 * David and Leigh Eddings' The Dreamers series ends with a massive Reset Button, using time travel to negate the existence of the Big Bad and thus negate absolutely everything that occured in the previous novels.
 * BBC Books' last full-length novel based on Doctor Who featuring the Eighth Doctor sets up a Reset Button to clear the novel continuity out of the way of the new series, but doesn't actually press it. Instead, the book ends on a cliffhanger. Lance Parkin left the door open in case the new series bombed, as the BBC thought it might have done. In which case, novel continuity would have (mostly or completely) ignored the new series continuity.
 * The main plot point reversed is the destruction of Gallifrey and the death of almost all of the Time Lords. Which then happens again (by different means) in the Backstory for the new series. Gallifrey is clearly a very unlucky planet.
 * The beginning of the book The Toyminator applies the reset button to the main characters so that they'll be exactly as they were when the hollow chocolate bunnies of the apocalypse (not misspelled), the previous book, began. This is only its first problem.
 * A Game of Universe features both direct and indirect examples of Reset Buttons. In the direct example, Germain goes back in time seven seconds after . The indirect example comes when.
 * Done in Animorphs when the gang go back in time to
 * Also done when they manage to acquire T-Rex morphs via time travel, likely to prevent it being a in-universe game breaker.
 * At the end of the Discworld novel Sourcery,
 * Hey, and what about Johnny and the Bomb, another Pratchett book? After when they return they don't know how it was before.
 * This is becoming a theme in Pratchett: the way the History Monks are evoked to ensure the correct passage of history happens, even if it means having to manipulate the timeline to do it. Small Gods, Thief of Time and the whole Koom Valley Thing are all examples of the Reset Button in action.
 * Dean Koontz has been known to abuse it as well, you get the impression he likes to kill his heroes a few times before letting them off.
 * Jack Chalker's Well World series has a universal (as in, resets the entire universe) reset button in the vast computer known as the Well of Souls. Only one problem: You have to destroy the entire existing universe, effectively killing everyone in it in the process. No wonder the sole remaining guardian tends to wipe his own memory and has to be dragged kicking and screaming back to the Well World to do his job.
 * Tom Clancy's novel Red Storm Rising features a large-scale conflict between the Soviet Union and the NATO countries, however Although there are still a lot of dead people and ruined naval vessels and so forth, so it's really just a political reset button.
 * There is a giant "reset to reality" after The Bear And The Dragon deleting everything that happened in the last four books
 * The SF novel Space Chantey by R. A. Lafferty has a literal reset button, called a Dong Button; if you've made a major blunder, you can press the Dong Button to go back and correct your mistake. One scene makes use of the fact that, since losing all your money on an ill-advised gamble is a major mistake, it would be useful to have a Dong Button in a casino, and always make the largest bet you can make.
 * H. G. Wells' "The Man Who Could Work Miracles" is a vintage example, in which the title character chooses to undo all the damage he's caused by willing that history re-set itself to just before he discovered his powers, at which point he'll lose them forever.
 * In Before I Fall, Samantha's day restarts every time she dies or falls asleep, whichever comes first, until the seventh day, when she dies for good.

Live-Action TV

 * My Name Is Earl sees Earl spending the last of his $100,000 lottery winnings in season 3. At the end of the season, his ex-wife leaves him $75,000 in savings after joining an Amish community, effectively putting Earl back where he started in the beginning of the series.
 * Given its dependence on Time Travel, Star Trek can often be found pressing this button. Star Trek: Voyager, specifically, may have caused irreparable damage to the entire Trope Console due to its constant, eager pounding of the Reset Button. Character development still continues despite the usage of the reset button on Voyager. In fact, fewer episodes hit the reset button than don't. Most of the episodes that do are time travel episodes.
 * Voyager did manage to do it once with style, in the episode "The Year of Hell".
 * The Voyager is in fact sometimes referred to as "HMS Reset Button"...
 * Oddly enough, one time the writers actually forgot they had pushed the reset button. A time agent is sent back to the 20th century and spends three decades viewed as a crazy bum, until the Voyager crew fixes things and meets him again in younger form, and he has no memory of the former timeline. Later, the agent shows up again and we find out that now he does remember those three decades and has a grudge against Voyager due to causing them.
 * This apparently had something to do with some sort of temporal insanity caused by having the proverbial reset button pressed one too many times... or something...
 * Not to be confused with temporary insanity; Voyager's type was indeed quite permanent and incurable.
 * iCarly has pushed the button with both major couples, Carly/Freddie and Sam/Freddie.
 * It spent three seasons building up the Carly/Freddie relationship. They got together in one episode after Freddie saved Carly's life then broke up based on Sam's questionable idea that Carly's feelings weren't real, leading to a Self-Fulfilling Prophecy when the reset button gets hit and none of the trio ever speak of it again.
 * Sam/Freddie got a 5 episode arc dedicated to exploring that relationship. They break up for a myriad of reasons and never speak of it again. The Sam/Freddie arc came after the Carly/Freddie one. Not a single line in the 5 episodes even mentions the fact that Freddie was and could easily still be in love with Carly and that Carly and Freddie were an item in the past.
 * Star Trek: The Original Series did push the reset button once, inexplicably, through time-travel; here, they undid events of the past by simply beaming future persons into their prior selves before the time-change, which somehow erased the future person's memory. This was a Reset Button since they conveniently claimed that by doing this, "it never happened--" when the two Air Force personnel were clearly on the Enterprise.
 * Star Trek: Deep Space Nine finally had to introduce a branch of Starfleet called the "Temporal Investigations", in which they cited Kirk as having committed seventeen separate temporal violations; the biggest file on record.
 * One egregious reset in Deep Space Nine is in the episode "To the Death," where the Defiant returns to the station to find one entire pylon has been blown up by a Jem'Hadar raid. It makes for a shocking visual, but by the next episode the station looks like new.
 * The episode of My Favorite Martian where Martin's nephew Andromeda ("Andy") shows up, ends with Martin using a time machine as a Reset Button when Andy's success in proving his and Martin's origins starts the neighbors looking for Torches and Pitchforks.
 * A rare example of a Reset Button without Applied Phlebotinum: the fifth season finale of Degrassi the Next Generation undid nearly everything that had happened that season, in order to get things in position for next season. Character relationships that had taken over a dozen episodes to develop undid themselves in less than ten minutes, and characters revealed that they had never really been that way. It was Cleaning Up Romantic Loose Ends, but also other loose ends.
 * The Torchwood Season Finale, "End of Days", features a
 * Used in the Doctor Who Series 3 finale "Last of the Time Lords",
 * Another example appears in "Father's Day", in which
 * A crueler example is that at the end of Series 4 finale "Journey's End". While the timeline is not reset at all,.
 * Also found in the Series 5 "The Big Bang" - most of the episode is devoted to finding a way to hit the Reset Button. Also, the pressing resets a bit more than the events of the episode, like.
 * And again in Series 6 "The Girl Who Waited" -
 * One important distinction regarding all the Doctor Who examples above is that, while a reset button has been pressed, memories of the reset events remain with at least one character (naturally, the Doctor) and occasionally others. "The Big Bang", while in the case of.
 * In the show's earliest years, the TARDIS console had a literal reset button in the Fast Return Switch. It only appeared in "The Edge of Destruction," and the First Doctor intended it to take Ian and Barbara home. Unfortunately, the damn thing didn't work right, and the TARDIS hurtled back in time toward the Big Bang. The Fast Return Switch was never used again.
 * Every time Monk appears to be making progress psychologically, some event in the episode will traumatize him even further. (For example: a blackmailer impersonates Trudy, an actor playing him has a psychotic break...)
 * Or something less big. Almost all of the filler-episode progress is undone in the last five minutes of that episode. This began to ease off in the eighth and final season, fortunately.
 * Both 1960s/1970s TV Westerns The Big Valley and Bonanza had the same thing happening, every time a male character in the show got serious with a woman or got married, she got killed off in some gruesome fashion or died of some horrible disease, or in childbirth, on the same episode. (Exception: Hoss' mother on Bonanza lasted two episodes.)
 * The pilot of the prematurely canceled remake of Fantasy Island involved a little boy whose fantasy was that his father would turn out to be his favorite superhero. In a very blatant Lampshade Hanging, the boy says that his hero's best superpower is the "reset button" on his video game, which allows him to return from death and undo all his mistakes—which is how the boy undoes all the trouble his wish has caused at the end of the show.
 * A number of times in the Stargate Verse: the Aschen arc, "Unending" and more recently Stargate Atlantis
 * In "Unending", the Reset Button is an actual button that's pressed near the end of the episode.
 * More recently, in the Stargate Universe episode "Time". The episode begins with a reset button having already been pushed, with the crew discovering a recording device sent back through time. It gave the crew enough information to figure out the episode's plot. It was either one of the best episodes so far or a complete disaster.
 * Dallas infamously Ret Conned a season into being All Just a Dream.
 * Kamen Rider:
 * Kamen Rider Ryuki has the Time Vent card, which turns back time. The person hosting the Rider Wars, Shiro, uses this card to get the ending he wants, but when he discovers that, he uses it one last time to revive everyone.
 * Much of Kamen Rider Decade: Final Chapter is about Tsukasa trying to find a way to reset the Kamen Rider multiverse to how it was before the interdimensional collapse and the Rider War that ensued from it.
 * In an episode of Wizards of Waverly Place a genie in a lamp comes with a literal reset button.
 * After killing off all but one of the entire cast of SeriesWitchblade, what else was there to do but turn back time in the first season finale?
 * In the Red Dwarf episode "White Hole", Lister knocks a planet into the hole to collapse it, causing all time spewed out by it to become null. Kryten explains that the few weeks events leading to this point will not have happened, all the while the decor around them slowly vanishes to a field of stars. Just as the cast themselves are about to vanish, Kryten takes the occasion to tell Rimmer just how much he hates him, ending with a final "Ha!" just as they all get reset back to the start of the episode again.
 * Angel pressed the Reset Button and erased the events of the previous 24 hours in the episode "I Will Always Remember You" in order to save Buffy's life. However, as the events erased including Angel becoming human and having a perfect night with Buffy, and that Angel's price for getting the Reset Button pushed was that he alone remembered everything, it became an instant Tear Jerker.
 * Debatable price, since it was only mentioned offhand a few times, especially after that specific episode, and then the series pretended it never happened and as of season 2 Angel actively sought humanity even though the same terms would still apply, to the point where
 * Well, Angel's eventual humanity is prophesized to come after he plays a pivotal role in the Apocalypse, at which point his job will be done. As much a head scratcher as  is, it just shows a major point of the premise: the good fight never ends. And when   he was speaking to
 * It can also be argued that at the time of Angel's 24 hours as a human, he had already had a pivotal role in multiple apolcalypses (on both sides, so that ambiguity is covered) so it was the fulfillment of the prophecy, and Angel threw it away. Though the later seasons of Angel indicate that "an apocalypse" and "the apocalypse" are different things.
 * Lost played with the idea for over a season. Ultimately, it didn't work and was just a Red Herring.
 * Buffy the Vampire Slayer does this at least twice:
 * In the season one episode "Nightmares", everyone's nightmares start to come true, but the effects are erased at the end of the episode. A debatable example, as the Scoobies retain a perfect memory of what happened.
 * A more definite example is the season three episode "The Wish". Cordelia makes a wish that propels the show into an Alternate Universe where the vampires have their run of Sunnydale. At the end, Giles destroys the MacGuffin that allowed the demon Anyanka to do this. The only character who remembers anything is Anyanka herself, who becomes human due to the destruction of said MacGuffin.
 * And if Vamp Willow had her way, there would most likely be some literal ass-biting, most likely with herself.
 * Cory in The House features a literal Big Red reset button. Established as a Chekhov's Gun early on. Given that it's sole appearance was in a Dream Episode, there wasn't much of a mystery as to what it was.
 * Happens once in Big Wolf on Campus.
 * Smallville is one of the biggest offenders in Reset Button land. Almost every episode has someone finding out about his powers, and then getting their memory erased, or leaving town, or dying. Only the season finales and premieres have any lasting character development. Any relationships he has will only last about two episodes before we're back to the Status Quo.
 * In the Smallville season 8 episode "Infamous", Clark's use of a Reset Button is referenced by trope name.
 * Smallville season 5 ep "Reckoning" - Clark telling Lana he's an alien, proposing to her, Lana's death and Lex seeing Clark using his powers is all undone by the end of the episode thanks to a crystal given to Clark by Jor-El.
 * Merlin has followed Smallville's example in many ways, even calling their show "An Arthurian Smallville". They also use the Reset Button just as much. Every time someone sees Merlin use magic, you know they're about to die, leave Camelot, or lose their memory. Also, every time it looks like King Uther might die, change his views on magic, or somehow lose his throne, the effect will be reset within two episodes. It's annoying, but an amusing game is to try to predict how the writers will get everything back to the Status Quo by the end of the episode.
 * Despite setting out to avert this trope, the conclusion to Battlestar Galactica's New Caprica arc at the beginning of Season 3 served as a Reset Button of sorts by      and resetting the show to as it was in Season 1, losing its momentum in many almost irrelevent standalones.
 * Even though the fleet's situation in Season 3 is similar to that of Season 1, they avert the Reset Button by having the characters spend almost all of the season dealing with the after-effects of the New Caprica arc: first with "Collaborators", then with "Unfinished Business", and finally with Baltar's trial which takes up the final three episodes of the season. Most of the characters and relationships were profoundly altered by the events on New Caprica. The plot was reset after New Caprica, but the characters weren't.
 * In the Heroes third Volume Villains, some of the characters referred to Hiro as their reset button in case anything went wrong in their battle against Arthur.
 * The third-season premiere of Chuck managed to reset a goodly bit of the core premises of the series, other than Chuck's Power Upgrade and his now-willing participation in the spy game.
 * Averted by the fourth season's end.
 * The children's game shows Where in the World Is Carmen Sandiego?? and Where in Time Is Carmen Sandiego?? do this in an interesting manner. At the end of every episode, one of Carmen's henchmen is always captured, and Carmen herself is sometimes captured. Everything is all hunky dory and the host of the show praises the winning contestant for saving the world, but then in the time between the end of that episode and the beginning of the next day's/week's episode, the reset button is hit, allowing Carmen to return to planning evil capers in every episode.
 * DAAS Kapital used this constantly and shamelessly. Whether Tim was turning into a were-cockroach, Richard had been revealed to be an exploding robot, Paul turned out to be a secret alien or rocks fell and everybody died, you could be assured that none of this would affect next week's episode in the slightest.
 * With House, M.D., the reset button is psychological. House goes through several life-altering events, and it always seems like he's going to change for the better - except he doesn't. The Button itself usually comes in the form of House's Vicodin addiction, and not surprisingly the signal that tells us he's "back to his old self" is usually him taking a pill.
 * Earlier in the series, the resets worked without any discernable button at all.
 * The amusingly literal-minded children's BBC sitcom Hounded sees its protagonist Rufus Hound sucked weekly into a parallel universe where he must face off with an incompetent Big Bad who is such a Card-Carrying Villain he's actually called Dr Muhahahaha, whose preposterous scheme of the week to take over the Earth is invariably foiled by the hero at the end of each episode - in expectation of which Dr Mu has installed a literal big red Reset Button he can press at this point, which rewinds the whole episode's plot back to the start of the day ready for him to have another crack next time...
 * Parodied in The IT Crowd: one episode where Jen is in danger of being fired by Ben Genderson ends with the note that "in the excitement they forgot to fire Jen and so that whole Ben Genderson thing didn't really go anywhere".
 * Subverted with Richmond, the goth living behind a mysterious door in the IT office. The episode ends with a clear reset, with them encouraging him to back into isolation behind the door, but he continues to appear irregularly in later episodes all the same.
 * One two parter episode of The X-Files called 'Dreamland' has Mulder accidentally switch bodies with a Man In Black working at area 51. Unfortunately, they find out there is no way to switch back, but luckily at the end of the episode, everything just sort of fixes itself, with time even reversing so that no-one remembers the events that took place. It's a pretty blatant Reset Button, and doesn't even make much sense in the way it works, but the episodes are such fun anyway, most fans don't seem to care.
 * Though Mulder still has the waterbed the Man in Black put in his apartment, and is very confused by it; a later episode has him saying "It was a gift. I think."
 * Used several times in Supernatural, though the principle characters are typically left aware of what happened: in Mystery Spot the Trickster (Gabriel) killed Dean over and over again, and then brought him back to as if nothing had happened following an excruciatingly funny Groundhog Day Loop, by Castiel in My Heart Will Go On (though it was passed off to everyone except Sam and Dean as All Just a Dream) when Fate forced him to retroactively re-sink the Titanic, and by Michael at the end of The Song Remains The Same, where the only notable change to reality by the end of the episode was the destruction of Anna, which apparently had little practical effect on anything.
 * No matter how often Colt Seavers totals his truck, he has always got a shiny new one in the next episode—in spite of the Running Gag that the truck isn't even paid off yet.
 * All that paint is cleaned up impossibly quickly at the end of Community episode Modern Warfare; the school looks pristine just a few hours after the game ended.
 * In the Frasier episode "Bla-Z-Boy", Frasier accidentally (or not) destroys Martin's ancient chair by setting it on fire and dropping it off a 19th floor balcony. At the end of the episode, he hires a weaver and a carpenter to construct an exact replica based on old photos. The fact that the recliner seen in the rest of the series is a replacement is never mentioned again.
 * In the Frasier episode "Bla-Z-Boy", Frasier accidentally (or not) destroys Martin's ancient chair by setting it on fire and dropping it off a 19th floor balcony. At the end of the episode, he hires a weaver and a carpenter to construct an exact replica based on old photos. The fact that the recliner seen in the rest of the series is a replacement is never mentioned again.

Music

 * "Asylum" by Disturbed has a literal case of this. The insane patient of the Asylum is having a Cuckoo Nest situation in which they're constantly trying to escape only to die or be killed as a result. The camera then closes into an image of a button with "Reset" written across it and suddenly he's back in his padded cell..

Professional Wrestling

 * At one point, WCW decided to strip all titleholders of their belts and start fresh, as the WWF had finally caught/passed them towards the end of the nWo storyline. Too little, too late.

Tabletop Games

 * In the card game Magic: The Gathering, numerous cards can wipe the playing field clear of any combination of permanents in play and/or cards in hand. Its typical use is in fast decks against slow decks. However, cards that better match the idea of a Reset Button are Lich's Mirror and Sway of the Stars, though neither are perfect examples; Lich's Mirror only provides a reset button for one player and Sway of the Stars sets players' life totals to 7 rather than the beginning 20 (but in every other way does in fact reset the game to the beginning).
 * Karn Liberated restarts the game, but still isn't a perfect example because all non-Aura permanents exiled by it start under you control.
 * Seriously, NOBODY remembers Yu-Gi-Oh! and its reset buttons? Final Destiny, due to its 5-card discard cost and the game's strict limit of only having 6 cards in your hand at the end of your turn, is virtually unplayable, though. (Certain other cards such as the continuous spell Infinite Cards, which is Exactly What It Says on the Tin in that there is no limit to either player's hand size, and Enervating Mist, a continuous trap that sets your opponent's hand size limit to 5, subvert this rule.) More widely used but less powerful versions include Heavy Storm and Dark Hole, which wipes all spells/traps and all monsters, respectively.
 * With gameplay the way it is they're not really "Reset Buttons", so much as "what you had is in the Graveyard", and for many strategies, Zombie decks in particular, this works in their favor. The closest thing to an actual reset button is the Banned card Fiber Jar, which resets everything back to the beginning save for RFG zone and Life Points.
 * Then there's Rainbow dragon, a 4000/0 special summon with no cost other than having all 7 different crystal beasts out, his effects can't be used on the turn he's summoned, but he has 2, the first is to send every crystal beast on you side of the field (a total of nine thanks to their effect of being spells when destroyed) to the graveyard for a 1000 point boost for each, the second is remove all crystal beasts in your graveyard from the game and then return every card on the field to their owners deck.

Video Games

 * The recent Simpsons'' game had the ultimate reset button when
 * Xenosaga made this a central plot point in the third game Thus Spoke Zarathustra and ultimate goal of the Big Bad.
 * Prince of Persia: the Sands of Time has the both the Sands themselves and the Dagger of Time, a (very) short-time reset button that allowed a player to undo huge mistakes like falling into a death trap, or taking a major beating in a fight. As well, the events of the entire game end up being reset by the end, and in the end movie the Prince uses the Dagger one last time to undo kissing the woman he fell in love with during the erased timeline, who rejects him for doing so while having "just" met her. In a unique variation, the Reset Button mechanism itself sets off the events of the second game, as the Powers That Be are out to punish the Prince for using it.
 * And it goes on... the time manipulations of the second game (erasing the existence of the Sands of Time) enable the third game to happen, as they result in the Vizier never being killed by the Prince during the first one. At the end of the third game
 * Final Fantasy V had a Time spell called Return or Reset (depending on which version) that you could use during combat to rewind to the beginning of the fight. This spell was very favorable to the player—it would also reset the battle condition. So, for example, if the battle began as an Ambush attack, the player could use this spell and the battle condition would most likely to be changed to a normal battle or even a preemptive attack. Also, it cost only 1 MP.
 * It also let's you attempt to steal items again, especially useful if you need a Rare Item from one of the rarer encounters.
 * Similarly several Wild ARMs games.
 * Super Mario RPG also rewound time for battles via an item called Earlier Times. This would reset the battle back to the start, including its conditions such as the party's status and items held at that time.
 * And Mario & Luigi: Bowser's Inside Story has Retry Clocks, which restart the battle if you get KO'd.
 * |Sonic the Hedgehog 2006: This was a good move on the design teams part.
 * Sadly, they didn't do it well enough, it seems, as people are still arguing over the Plot Hole involving Blaze. Nevermind that the Sonic Rush Series subseries completely disregards that game; granted, there's the Sonic Rivals subseries (which features Sonic's first meeting with Silver post-reset), but considering how the first Rivals game has no definitive ending, this is questionable at best.
 * In  The Legend of Zelda: Majora's Mask , the Reset Button is one of the central gameplay elements. Link only has three days to save Termina—if he runs out of time, he has to play the Song of Time to go back to the first day, and everything that has happened to the world or the characters is reset. You can theoretically do it all in one cycle, but you have to really know what you're doing.
 * Parodied in Grand Theft Auto 3's ingame radio chat show channel Chatterbox, in which, while discussing video games, ironically, the show's host Lazlow and a caller get to the concept of reset buttons. The caller says "Life does not have a Reset Button" to which Lazlow responds that the show does and proceeds to prove his point by pressing said button. Since the game disc can only hold so much, the radio show must keep repeating the same things. The Reset Button on the show just explains that away easy.
 * Lufia II gives Maxim the Reset spell, which lets him reset a puzzle room to prevent you from getting stuck if you screw up a difficult puzzle.
 * The second Ar tonelico has a Song Magic called the Reset Button. It resets the battle. Supposedly, you use it to reset bad things that might happen in battle, but there's really no point... And then later on, weird things happen to the Reset Button in its so-called "upgrades".
 * Most gaming consoles have either a reset button or a combination of buttons (ex: A + B + Select + Start) which would reload the game from the menu screen. This was essentially inputted so as to not hurt the console, as turning it on/off quickly could fry some important stuff. There's even one on the computer which you are using right now!
 * Super Mario Galaxy ends with
 * of Knights in The Nightmare.
 * In The Legend Of Spyro Trilogy, it turns out
 * Mortal Kombat 9 resets the entire Mortal Kombat series, starting at the very beginning of the first ever Mortal Kombat tournament. But since Raiden now has knowledge of the future (and the events of the future games), some things are going to change.
 * All Super Mario Bros. games. No continuity whatsoever, because Shigeru Miyamoto feels that it may limit the development of future Mario titles. Considering that The Legend of Zelda, his franchise which does have a continuity, is a bit of a timeline clusterfuck, he may have a point.
 * The retries in the Blinx the Time Sweeper series act as this, reversing time to before you made the fatal mistake so you can try again.
 * Every time you ascend in Kingdom of Loathing, things rapidly go back to the way things were at the beginning of the game, requiring you to to go back and do it all over.
 * In Bastion,
 * In BlazBlue,

Web Comics
"Sarah: Grace finally snapped and destroyed half of Moperville. Tedd: TO THE UNDO BUTTON!"
 * Done literally in this Perry Bible Fellowship comic..
 * The Order of the Stick, strip #570.
 * Also, when  the gods simply made a new one.
 * Spells and Whistles has reset itself several times while finding its own unique artistic style (the first such occurrence caused by a cease-and-desist from Pv P) and eventually went on to intentionally keep on hitting the reset button as part of the story narrative. An alternate main character breaks out of her doomed comic universe to hunt down those she feels are responsible for her life coming undone.
 * MSF High: Not totally, but at the end of the day, all injuries heal, the dead rise, and transformed students can choose to change back or keep the new form forever.
 * The Way of the Metagamer has a literal example.
 * Okay, on a dare from one of his friends, Jesus of Gods Playing Poker and Quetzalcoatl went off on an adventure.  His father decided to just reset everything.
 * Another literal example exists in City of Reality, in the form of a device that allows its owner to rewind time for everyone except themselves. A point is made to show just how horribly this can be abused.
 * In a odd variation, this is part of how the plot of Misfile gets started, with the last two years of Emily's life (including acceptance into Harvard) being erased. She remembers them, just nobody else.
 * In Schlock Mercenary this is done by one Kevyn, the company Mad Scientist, who uses a special wormgate to essentially Save Scum the whole universe
 * Homestuck plays it for drama:
 * You know what the awesome thing is? All of the kids
 * Averting this is the Word of God reason why there is no time travel in El Goonish Shive.
 * Averting this is the Word of God reason why there is no time travel in El Goonish Shive.

Western Animation
"Spider-Man: I can't believe that in a minute we're going to forget something as incredible as all this! Iceman: As incredible as what? Spider-Man: (shrugs)"
 * In Superman: The Animated Series, all of Mr. Mxyzptlk's handiwork is apparently undone when Superman tricks him into returning to the fifth dimension.
 * In the fourth season of Teen Titans, Raven becomes the portal for her father Trigon to enter the world, after which he transforms the entire planet into a lava-covered inferno. However, at the end of the arc, Raven calls upon the powers of friendship and deus ex machina to reset everything and restore the world to its original form.
 * Code Lyoko has a Reset Button (the RTTP or "Return to the Past" program) that gets used in the majority of the episodes, though they generally can't do this until XANA's current scheme has been defeated.
 * Later attempted to balance it out, by saying that every time they do, XANA gets stronger. So they stop doing it every episode.
 * It also has the limitation of being unable to bring people back from the dead.
 * Erasing someone's recent memory to prevent them from "knowing too much" is a common device. This has been used in Futurama and the movie Dude, Where's my Car?, among others. See Memory Wiping Crew.
 * The three-part Time Travel episode of Kim Possible, "A Sitch in Time", undoes all memory and consequences of its events by story's end. The twist: Ron retains the memory of hating Norwegian meatcakes, even though his move to Norway was undone, and thus he never tasted any.
 * In The Fairly OddParents, Timmy frequently has to hit the reset-button by un-wishing whatever disaster his thoughtless wishing caused this time—often delayed by lost or stolen wands.
 * Subverted when the show was Uncancelled. Jorgen has just taken Cosmo and Wanda's to train it. Timmy lets out a Big No, and is horrified by Cosmo and Wanda's indifference until he realizes that, as he had all throughout the episode.
 * One episode includes Timmy wishing for a literal reset button, and going through his day dozens of times.
 * The Code Monkeys episode "Todd Loses His Mind" has a very literal Reset Button ending: just as Dave and Jerry are about to be shot by Mr. Larrity, and Todd is about to blow up Gameavision HQ, the Code Monkeys "game" locks up, and the "player" is forced to start over.
 * Subverted in a (non-canon) The Simpsons Treehouse of Horror story, in which Homer's brain is taken out and placed in a robot by Mr. Burns, but his lack of motivation and love of donuts overrides any orders given to him and he ends up only causing destruction and doing nothing. In the end Mr. Burns puts Homer's brain back, but he is crushed under the weight of the heavy robot's body. He tells his assistant Smithers to get surgical tools and ether before Homer wakes up screaming in bed, thinking the whole story was just a dream... then he notices that Mr. Burns' head was grafted onto his shoulder as a way of preserving him. A teaser of the next episode of the Simpsons involves Homer being stuck in an Sitcom-esque situation where Homer has to do what Marge asks him to and also attend a meeting for Mr. Burns, causing him to exclaim, "Oh, I hate having two heads!"
 * The Simpsons is also home to arguably the best-known Reset Button of modern times:
 * This is briefly referenced in a later episode when Principal Skinner notes that Lisa is constantly replacing her cats and calling them Snowball to avoid discontinuity.
 * A similar example occurs in the recent episode "Donnie Fatso", where
 * And a lampshading by Lisa: "Don't worry, Bart. It seems like every week something odd happens to the Simpsons. My advice is to ride it out, make the occasional smart-alec quip, and by next week we'll be back to where we started from, ready for another wacky adventure."
 * "Lisa episodes", with "Lisa the Vegetarian" as the exception, tend to do this. "She Of Little Faith"? Lisa's Bhuddisim is never mentioned again. "Lard of The Dance"? Alex Whitney never appears or is mentioned again, except for a one-liner and the occasional cameo. "Bye Bye Nerdie"? Francine and Poindextrose are never mentioned again. So it makes sense that Lisa has mild Medium Awareness.
 * The ending to one of the Captain Scarlet and The Mysterons Complilation Movies featured Spectrum being blown to smithereens, only for the Mysterons decide to be merciful and tell them they'd be back. In the original episode, it was revealed to be All Just a Dream.
 * The episode "The Fantastic Mr. Frump" of Spider-Man and His Amazing Friends featured an ordinary man who accidentally gained reality-warping powers. After being egged on by Doctor Doom and unintentionally causing a great deal of trouble (including summoning up "the weirdest creature in the universe"), everything gets reset back to normal:

"Candace: (after watching the news) I was robbed!"
 * Done in almost every single episode of the Challenge of the Superfriends. The Legion of Doom would trap some or all of the Superfriends in some sort of deathtrap or Rube Goldberg scheme, but the heroes would escape and catch the villains, who would then invariably escape.
 * For an example of a Reset Button inside of a Reset Button, there is the episode "Rest in Peace Superfriends" where the Legion of Doom actually succeeds in murdering all of the Superfriends, only for them to reveal that they actually killed robot clones of the Superfriends.
 * This happens in an episode of Family Guy in which Stewie builds a time machine.
 * At the end of the episode "FOX-y Lady", Peter asks Lois how she lost her job at FOX News. She answers, "Oh I don't know. Does anyone really care?" Peter says that she's right- by the end of every episode everything is back to normal.
 * This trope is subverted in one episode: Peter loses his job and doesn't get it back at the end of the episode.
 * Danny Phantom employs this once via time travel and once with a wish. (The episode with the wish is generally ignored by fans) To be fair, it stopped quite a lot of death from occurring, including Danny's whole family. It did have (fortunate) repercussions, however. Danny is now aware that Jazz knows his Secret Identity.
 * And one using the Reality Gauntlet. Also a cry of disdain from fandom as it involves erasing his parents' memories of his life as a half ghost, despite the fact that they accepted it in full!. For a show with continuity, this is an jarring Status Quo Is God moment.
 * One Drawn Together episode spoofs the Superman movie time reversal
 * In the first of a two part episode of Spider-Man: The Animated Series entitled "The Hobgoblin", Peter Parker finally moves out of his Aunt May's house to live with Harry Osborn in an apartment. To keep the status quo, he cannot be allowed to stay in said apartment, so the writers fabricated a rather flimsy excuse. During a visit by Aunt May to Peter's new apartment, which has been trashed from the previous night's housewarming party, the Hobgoblin attacks and kidnaps Harry, in the process sending Aunt May into a shock so fierce she goes into some kind of coma. She remains this way until the end of the next episode, after which she wakes up and tells Peter, to his surprise, her shock was at the mess in his apartment; not the Hobgoblin's attack. After which Peter thinks he's not ready to move out on his own, so moves back in with his Aunt and by the next episode, status quo is back to normal.
 * X-Men: Evolution has a bit: When the Brotherhood of Mutants attacks a high-school football game and reveals all of the X-Men, you hope. Then Professor Xavier mind-wipes a stadium filled with people, and the broadcast, apparently, got cut. A later reveal would be too broad to mindwipe, though.
 * The '90s X-Men cartoon has a flatly ridiculous one: Scott proposes to Jean, she accepts, and they get married in a big ceremony. But, oh no, it turns out the priest was actually a disguised villain, so they're not really married! And despite their feelings not having changed, it never occurs to them to just have another ceremony, until a couple of seasons later. Presumably the idea was to not completely shut down the Scott/Jean/Logan love triangle. They eventually got married for real.
 * In the Futurama episode The Late Philip J. Fry, everything in the year 3010 remains the same as before, despite various screwing with the timelines as the universe cycled.
 * The South Park Imaginationland trilogy has terrorists invade our imagination, the evil characters taking over, and Al Gore nuking the area. Butters restores everything to the way it was in the end.
 * Literally pressed in ReBoot by the User. Two keystrokes, and Mainframe is restored to it's season 1 state. It even brings back dead characters, and clones Enzo. This was a risk though, as the characters had to make the user restart the system, and there was a chance that everything would just outright crash.
 * Phineas and Ferb does this Played for Laughs, so the show can find the most off-the-wall ways to prevent the boys from getting caught by their parents.
 * Usually the resetting is limited to the boys not getting caught, but "She's the Mayor" went WAY farther. After becoming mayor of Danville for a day, Candace uses her position to reveal her brothers' newly built classic frontier village (complete with gold-loving old coot). Just as Linda calls the boys out to punish them (although it makes no sense why, since their village wasn't hurting anyone, but that's another trope), Doofenshmirtz activates his Accelerate-inator (which he invented to speed up having to play golf with his brother) which opens up holes in the space time continuum (which Doof knew would happen, but figured it was worth it), resetting everything back to earlier that day, with the old coot winning the contest instead and no one having any knowledge of what happened.


 * The recent TV Movie did this, erasing the characters' knowledge of Perry's secret identity at the end of the movie. In addition, the movie deconstructs the continued use of this trope: After hundreds of "coincidental" occurrences, Candace begins to believe that there is a literal "mysterious force" that prevents her mom from ever seeing what her brothers are doing. (Actually, she more-or-less prays to it in an earlier episode, "Phineas and Ferb Get Busted".) After Candace disappears through an interdimensional portal, best friend Stacy even builds a shrine to the "mysterious force".
 * Enforced in an episode of the Animaniacs reboot. In one Pinky and the Brain segment, the duo end up in a high school science lab, about to be dissected by one of the students, the segment ending before they're about to be cut open. The final segment - where the three Warner siblings give a press conference - one report shows concern for the duo, but Yakko assures him than tomorrow night they'll be back doing the same thing they do every night, and  "you gotta respect that, man!"