[[quoteright:250:[[Webcomic/{{Oglaf}} http://static.tvtropes.org/pmwiki/pub/images/oglaf_175.jpg]]]]

->''"Theorizing that one could time travel within his own lifetime, Doctor Sam Beckett stepped into the Quantum Leap accelerator -- and vanished. He awoke to find himself trapped in the past, facing mirror images that were not his own, and driven by an unknown force to change history for the better. His only guide on this journey is Al, an observer from his own time, who appears in the form of a hologram that only Sam can see and hear. And so Doctor Beckett finds himself leaping from life to life, striving to [[TropeNamers put right what once went wrong]] and hoping each time that his next leap... will be the leap home."''
-->-- '''Opening''', ''Series/QuantumLeap''

The character receives foreknowledge of what will happen (or, if TimeTravel is involved, RippleEffectProofMemory will allow them to remember what happened "the first time around") and has to [[RubberBandHistory correct it.]]

Constitutes the plot of nearly every episode of ''Series/QuantumLeap'' ([[TropeNamers from which this title was taken]]), ''Series/EarlyEdition'', ''Series/SevenDays'', and ''Series/TruCalling'', as well as a majority of episodes of ''Series/TheDeadZone'', and numerous individual episodes of other shows. Can form the {{arc}} of a whole series, as in ''[[Series.{{Heroes}} Heroes]]''.

Distinguished from GroundhogDayLoop by:
#The character's knowledge of what needs to be corrected prior to the first time through, and
#Usually only one attempt to correct it is necessary or in fact possible.

Combinations of GroundhogDayLoop and Set Right What Once Went Wrong are possible, however, and have been used on occasion: see for example "The Siege" on ''Series/TheDeadZone'', the ''Series/TruCalling'' episode "The Longest Day", ''Series/EarlyEdition'''s "Run, Gary, Run." In fact, this combination is the entire premise of ''Series/DayBreak''.

Sometimes, trying to set right what once went wrong is what [[YouAlreadyChangedThePast sets everything wrong in the first place]], resulting in a StableTimeLoop and TwoRightsMakeAWrong. Succeeding would create a TemporalParadox (i.e. if you do manage to set right what was wrong, you would have no reason to travel back in time in the first place, which means the wrong-ness would still be there, so you'd travel back in time, etc.) When the purpose of the time travel is to save a person (but not alter the timeline) by pulling the person out of time, it's a TimeTravelEscape. Stopping people before they commit the crimes often results in a BewilderingPunishment. If fixing the wrong doesn't involve making actual changes "by hand" but just doing something to make history [[RubberBandHistory snap back into place]], that's a ResetButton.

Depending on how time travel works, this can pose a big moral dilemma: even if history has been altered to create a terrible new present, it's doubtful that ''everything'' about the new present is terrible. Most notably, new people have probably been born in it who never existed in the original timeline. Will "fixing" the timeline cause these people to cease to exist? Note that in a "branching timelines" scenario, there is no danger of this because there is no way to unmake the bad present, only to create a better divergent branch off of it, or to find your way back to your original branch.

Often the adventurer has to travel to fix things, combining this premise with AdventureTowns. This premise has also been applied to literature rather than time, with characters trapped in a PortalBook interfering with the book's original plot and being forced to set things back on track to resolve "the right way."

Contrast MakeWrongWhatOnceWentRight, where the time traveler acts for either selfish purposes or because [[ChaoticStupid they're living on Crazy Street]].

Note: UsefulNotes/WorldWarII did not go wrong. Traveling there [[HitlersTimeTravelExemptionAct will only make it worse]].

!!Series Plots


[[folder:Anime & Manga]]
* ''Anime/GeneratorGawl'' seems to fall into this category, seeing how the only reason Auge was able to take over was because Gawl, Koji, and Ryu went back in time to stop them. In the end Ryu was the one who created the include cells and gave Auge the ability to take over, which is what caused them to go back in the first place, turning it into a StableTimeLoop.
* An attempt at this is the driving force behind the MythArc of ''Anime/RaveMaster''. The series inverts the trope because changing history back to the way it was is the ''bad guys''' plan, as the original timeline's world was utterly destroyed save one survivor, who was able to change history to create the Rave world. On top of the [[EldritchAbomination Eldritch]] [[ClockRoaches Clock Roach]] out to undo the paradox involved, most of the late-story baddies want to see the "false" world destroyed.
* The premise of ''Anime/FlintTheTimeDetective''. The Time Shifters got scattered throughout history, changing the way certain historical events played out, and the Time Detectives have to capture them and put the past back the way it was.
* The final arc of ''LightNovel/FullMetalPanic'' reveals that this trope is the motivation of [[BigBad Leonard Testarossa]] and his allies -- their goal is to send the Whisperer [[spoiler:Sophia, possessing the body of Kaname Chidori]] 18 years backwards to prevent the Yamsk 11 incident from happening, which would change the world into one more like RealLife. The moment where it all breaks down is [[spoiler:when Sousuke is apparently killed by Leonard and Sophia uses this to persuade Kaname, showing her a reality where Sousuke was an ordinary boy rather than a child soldier. At first Kaname seems happy, but she realizes that he's not the same Sousuke she fell in love with and rejects the plan, refusing to run away from reality even if it means living in a world where Sousuke is dead. Thankfully though, he isn't.]]
* [[spoiler: [[TheStoic Homura]]]] from ''Anime/PuellaMagiMadokaMagica'' leaps time to save [[spoiler:Madoka]] from becoming a [[spoiler:''MagicalGirl'']], or more commonly known as a [[spoiler:[[OurLichesAreDifferent Lich]]]] that may transform in the future into a [[spoiler:[[EldritchAbomination witch]]]]. [[spoiler: Each successive attempt only makes things worse. However, each attempt manages to make Madoka stronger until she AscendedToAHigherPlaneOfExistence upon making her contract in this timeline]].
* One of the arcs in ''Manga/{{Kurohime}}'' involves two of the titled character's foes (Kurohime considered a bad guy in that world) going back in time to try killing her, for personal reason (revenge being the main motive, but also to keep the father of one of them being killed by her.) [[spoiler: Its a bit of a twofer subvision. 1) They realize Kurohime not as evil as they figured and learn the reason behind her motives and 2) ''They'' wind up inadvertently causing the events that lead to the father's death. Kurohime wasn't even trying to kill him but took the blame anyway.]]
* Manga/{{Amakusa 1637}} is built around this trope. Six schoolers from modern Kobe end up thrown in the Nagasaki of 1637, few before the failed JapaneseChristian rebellion of Shiro Amakusa; once they reunite and assess their situation, they decide to pull this trope to avert such tragedy. [[spoiler: It works.]]
* This is the story of the first ''Anime/TenchiUniverse'' film, ''Tenchi Muyo in Love'' - the creature KAIN had killed Tenchi's mom in 1976 and the gang has to go back to stop him.
* This quickly becomes a running plot point for ''Manga/MyWifeIsWagatsumaSan'' - Aoshima sees some aspect of the life of either him or his friends that he bemoans, so he tries to find some way to correct it in the present.
* The ''Anime/YuGiOhTenthAnniversaryMovie'' was this for ''the bad guy'' - he believes that Duel Monsters would bring about the end of the world and he seeks to kill Pegasus to stop it from becoming popular.
* In ''Manga/RockLeesSpringtimeOfYouth'', Lee instinctively tries to kill Obito, stating he has the feeling that everyone will be better off if the Uchiha is dead.
* The premise of shoujo manga ''Manga/{{Orange}}'', where main character Naho receives a letter from her future self that warns her of the future death of a close friend, and it's up to her to prevent it.

[[folder:Comic Books]]
* ''ComicBook/{{Exiles}}'' was supposedly pitched as ''Series/QuantumLeap'' or ''Series/{{Sliders}}'' with superheroes.
* ''ComicBook/BoosterGold'' does this quite a bit as the secret protector of the time line. It's when he has to set wrong what once went right or keep wrong what once went wrong that things get really morally complicated for him.
* In Marvel's ''Comicbook/CivilWar'' storyline, the entire event was kicked off when Namorita, a member of the NewWarriors, fought a villain named Nitro whose ability was to explode. Said explosion killed hundreds, including Namorita herself. Because of this, Namorita's name was posthumously slandered with the rest of the NewWarriors, much to the chagrin of her ex-lover, Richard Ryder aka Comicbook/{{Nova}}, even though they'd been broken up for years at that point. In his eponymous series, Nova is plucked out of the timestream along with a Namorita who is obviously from an era not only before the Civil War incident, but while she and Ryder were still lovers. Later, when the cosmic forces that threw them together start to send them back where they belong, Nova (being a {{Paragon}}-type character), refuses to let Namorita return to her own time (where she'll be doomed to repeat the same fate) and brings her to the present instead... consequences be damned.
* In an issue of ''Marvel Two-in-One'', the Thing goes back in time to cure his past self of being an orange-skinned monster and change his own life, but only succeeds in creating an alternate timeline where a now-human Ben Grimm quits the ComicBook/FantasticFour and is replaced by Spider-Man. This becomes MakeWrongWhatOnceWentRight in a follow-up story, when it is revealed that the absence of the Thing on the FF results in [[PlanetEater Galactus]] succeeding in his initial attempt to feed on the Earth, leaving the remnants of humanity with a CrapsackWorld low in vital resources.
* In ''ComicBook/HelOnEarth'', the main antagonist, [[WellIntentionedExtremist H'el]], wants to travel back in time to before his home planet Krypton [[EarthShatteringKaboom exploded]], and prevent its destruction. However, the energy needed for the time travel would destroy our entire solar system. Not that H'el [[FantasticRacism cares about our solar system]].
* In ''ComicBook/AgeOfUltron'', Wolverine decides to go back in time and kill Hank Pym, who created the robot Ultron which would annihilate humanity in the present. However, by killing Hank Pym, Wolverine creates a new dystopian timeline where the Avengers disbanded because of Pym's death, and Morgan le Fay is constantly threatening the small part of the world she hasn't conquered yet. He then travels back in time and prevents himself from killing Pym, but now makes Pym create a way to destroy Ultron when necessary.
* In the ''Series/StarTrekTheNextGeneration'' mini-series, ''The Last Generation'', the Federation has collapsed because the Khitomer Accords from ''Film/StarTrekVITheUndiscoveredCountry'' were never created as the Federation President was assassinated. After the last real bastion of the Federation discovers the android Data, who has realized this timeline is not the real one, they have to go back in time to make sure the Accords are created, stopping a MakeWrongWhatOnceWentRight plot in the process.
* In ''ComicBook/{{Seconds}}'', the red mushrooms give Katie this ability, which she starts to irresponsibly abuse [[spoiler: and ends up sending everything to hell]].

[[folder:Fan Works]]
* In the ''TabletopGame/{{Warhammer 40000}}'' Fanfic/Play by post story [[http://1d4chan.org/wiki/Abaddon#Abaddon.27s_14th_Black_Crusade Abaddon Quest]], there's a rather amusing [[InvertedTrope Inversion]], the eponymous Chaos Lord and his flunkies travel back in time to kill the GodEmperor as a baby, which is to say they travel back to MakeWrongWhatOnceWentRight. Considering [[{{Imageboards}} /tg/'s]] [[GeneralFailure Opinion]] of Abaddon, FailureIsTheOnlyOption. As is [[HilarityEnsues Hilarity.]]
* In ''VideoGame/HetaOni'', [[spoiler: Italy has been rewinding time again and again so that everyone can get out of the HauntedHouse alive.]]
* ''Fanfic/ACrownOfStars'': [[BigGood Daniel]] travels back and forward in time bringing Shinji and Asuka along with him to fix the mistakes of the past.
* ''Fanfic/OnceMoreWithFeeling'': [[PhysicalGod Lilith]] misunderstands [[WoobieDestroyerOfWorlds Shinji]] when he says he wants to go back, and she sends him back in time. Shinji gets shocked but he decides that he will use that chance nevertheless to [[TheAtoner atone for everything that he did and did not]]]. He is so determined to win the Angel War, protect his surrogate family and make amends that his behaviour gets [[ParentalSubstitute Misato]] puzzled, since she does not understand why [[ChronicHeroSyndrome he goes out of his way to help everyone and make them happy]] (and he cannot tell her he feels [[SurvivorGuilt guilty]] [[MyGodWhatHaveIDone for leaving her, Asuka and Rei dying]] and [[ItsAllMyFault obliterating the whole humankind]]).
* Subverted in ''Manga/ReTake''. [[spoiler:Shinji of [[Anime/NeonGenesisEvangelion End of Evangelion]] wakes up in the past, just after the battle with Leliel. He tries to set right everything that went wrong to prevent the End of Evangelion. It turns out he's only making life better for an alternate version of himself, and there's nothing he can do to change that. He eventually accepts it, and returns to the CrapsackWorld future he belongs to. Though there is an implication of a HappyEnding for him, so it's all good.]]
* ''Fanfic/TheSecondTry'': After surviving on their own [[AfterTheEnd in the post-TI world]] Shinji and Asuka wake up one day and find they have traveled back in time. Shinji quickly thinks of looking for some way to prevent the [[EndOfTheWorldAsWeKnowIt end of the world]], but [[TheWoobie Asuka was too depressed to try at the beginning]], and he needed to convince her.
* The ''Fanfic/PonyPOVSeries'' RecursiveFanfiction ''[[http://fav.me/d4lrntt Fading Futures]]'' has Twilight Tragedy manage to break free of Discord's control in the [[BadFuture Epilogue timeline]] and seek to change the past so that Discord never won in the first place. She manages to do so, but as a result, the timeline she inhabits no longer exists and everything in it are "reborn" into their main timeline counterparts. [[spoiler:Realizing this, she invokes her SuperpoweredEvilSide, Nightmare Purgatory, to take her revenge on Discord before the "rebirth" is complete. She realizes at the last moment she's dangerously close to becoming SheWhoFightsMonsters and manages to stop herself from finishing the job, preferring to [[DyingAsYourself fade away as Twilight Sparkle]] instead of becoming a monster, [[WhatYouAreInTheDark even if no one, not even her, will ever know]].]]
** The write eventually [[http://fav.me/d8rjexp did another story]] were [[spoiler:the Twilight from the final loop subtly alters things to create a universe were Eclipse never existed at all and Discord was defeated straight up.]]
** [[spoiler:Later in actual canon, its revealed Twilight failed because a ''previous'' Twilight ''didn't'' have a HeelRealization and became [[BiggerBad Nightmare Paradox]], and undid the Set Right What Once Went Wrong to keep punishing Discord.]]
** It's revealed that [[spoiler:this is the goal of the Anti-Hooviet Rebels that Shining Armor meets in his arc. 25 years ago, the Shadow of Chernobull, a [[RealityWarper reality bending]] imagination monster was released from [[SealedEvilInACan Pandora's Box]] by the Hooviets. After [[SpaceTimeEater devouring countless existences and imaginations]], it becomes [[ParodySue General Admiral Makarov]], the BigBad of Shining's arc, who prevented the Hooviet Empire from collapsing when it was supposed to and ultimately attempting to warp the world to his own ends. The goal of the Rebels (and Shining Armor) is to lure the [[ClockRoaches Wolf]] to Makarov so it can [[RetGone erase him from existence]] and return everything to how it would have been had he not escaped.]]
** This turns out to be [[spoiler:Amicitia's]] entire ''purpose'' as Spirit of Happy Endings. She travels to various [[DarkFic Grim Dark]] worlds and interferes to nudge an event in the right direction to do this trope. [[spoiler:This includes the various timelines that Nightmare Eclipse brought ruin to.]]
* The plot of [[GetBackToTheFuture "Time Terror"]], an episode of ''Fanfic/CalvinAndHobbesTheSeries'', involves Calvin trying to rescue his friends from different time periods before time gets screwed up.
** Also used in "Super Calvin" by [[spoiler:''Hobbes'', of all people, when he learns that Calvin's new superpowers are a DeadlyUpgrade.]]
** Then there's the very end of "Thunderstorm", where [[spoiler:[[ResetButton everything that happened in the special is undone.]]]]
* An omake for ''FanFic/WhiteDevilOfTheMoon'' had [[Franchise/SailorMoon Chibi-usa]] (Or rather, a [[Franchise/LyricalNanoha Nanohaesque]] version of Chibi-usa) travel back in time, believing she was doing this trope by making sure Nanoha never met Fate. Cue Vivio, who believes that by preventing Chibi-usa from doing that, ''she'' was doing this trope. [[spoiler: Vivio won.]]
* Subverted in ''[[http://www.fanfiction.net/s/2149801/1/Out-of-Time Out of Time]]'' when a time traveling [[RurouniKenshin Kenshin]] considers trying to [[spoiler: save Tomoe]], but discards it when he considers how the timeline could be screwed up (and then finds out he's arrived at too late a time to change it anyway). Also subverted by [[spoiler: Saito]], who not only doesn't try to change the status quo despite the opportunity and motive, but risks his life attempting to keep it instead.
* [[https://www.fanfiction.net/s/10316270/1/Too-Far "Too Far]] has [[spoiler:Diamond Tiara accept a [[DealWithTheDevil deal with Discord]] to get a do over and avoid causing Dinky to be DrivenToSuicide by her bullying (which finally caused Diamond to realize her actions have consequences).]]
* In ''Fanfic/TwilightThenTwilightNowUniverse'' fanfic ''The Magnificent Six'', this is the villain's big plot, and it is used to divide the new Elements of Harmony: [[spoiler: Applejack, being the original [[WesternAnimation/MyLittlePonyFriendshipIsMagic Element of Honesty]], is swayed to join the villain and stop the {{Gotterdammerung}} that resulted in the current present. The other five, being native born to the present, find this insulting and horrifying and fight her to stop her going through with it. GreyAndGrayMorality is invoked because, as much as it's only natural the mortal elements would want to preserve their own existence, Applejack has an unquestionable point that the present is a ''[[CrapSackWorld nightmare]]'' compared to the [[SugarBowl Equestria when she was born]], and so one has to wonder if undoing the BadFuture (from Applejack's perspective) is really so wrong.]]
* This is the premise of ''Fanfic/{{Recoil}}''. A certain battle has GoneHorriblyWrong and Taylor is sent back in time to try and do better.

[[folder:Films -- Animation]]
* ''Anime/TheGirlWhoLeaptThroughTime'' involves a girl who learns she has time-traveling powers, but each jump makes things worse. She has to stop herself from screwing everything up over and over.

[[folder:Films -- Live-Action]]
* In ''Film/{{Triangle}}'' this is what Jess tries to do after she realized she's in a GroundhogDayLoop. [[spoiler: But it only created another timeline which we don't see completely in the movie.]]
* The three ''Franchise/BackToTheFuture'' films feature this, each in different shades.
** In the [[Film/BackToTheFuture first one]], Marty accidentally travels back in time 30 years, and has to enlist the help of that time's Doc Brown in order to get back home. However, before meeting him and explaining himself, he alters the event that made his parents meet and fall in love; his father remains a social outcast while his mother develops attraction towards him. Marty's eventual solution to this problem has the unexpected bonus of his father being more confident and assertive over Biff in 1985, leading to this trope in a roundabout way.
** The [[Film/BackToTheFuturePartII second one]] begins with Doc taking Marty to the future to stop his son from getting arrested. It also shows that due to Marty being overly sensitive to being called a coward, he wasn't living as good a future as he could. However, Marty is forced into a more extreme example of this trope shortly afterwards; he planned to take a [[TimelineAlteringMacGuffin sports almanac]] back to the past with him to become filthy rich by predicting the wins accurately to the end of the century. The 2015 Biff hears the plan, and steals the time machine just long enough to give the almanac to his 1955 self, leading to a BadFuture where Biff killed Marty's father and married his mother, and ruled over a lawless city. When Marty discovers the root of the problem, he has to go back in time to destroy the almanac.
** The [[Film/BackToTheFuturePartIII third movie]] has Marty go back further in time to 1885; when lightning struck the time machine, Doc Brown was imprisoned there, but sent a letter to Marty in the present to explain where and when he was, and that he was perfectly happy. Marty enlists the 1955 Doc to repair the time machine to get him back home, but they discover Doc's gravestone from less than a week after he mailed the letter, saying he was shot by Buford Tannen. Marty travels back to 1885 to save the Doc, and in the end, he alters his own future by overcoming his own ego and the taunts of others, and Doc's by saving his life and getting him a lover.
* ''Cyborg 2087''. In the far future, a mind-control invention has been abused to create a police state controlled by cyborgs. Garth, a good guy cyborg, travels back to 1966 to convince the invention's creator to keep it secret and thus change the future.
* The two {{time travel}}ers in each of the ''Franchise/{{Terminator}}'' films are each trying to [[TerminatorTwosome set right the wrong the other one caused]].
** Until Genisys, which has Skynet send back a Terminator to assassinate John and Sarah.... AND stop Judgment Day. What the hell is going on here?
* The film ''Film/{{Frequency}}'' is about a man who can communicate with his dead father through a family ham radio thanks to an Aurora Borealis that appeared in the same timespan between 1969 and current-day 1999. He uses this communication to save his father from his impending death in a warehouse fire, but that sets off a chain of events that lead to his mother's death, so the two work together to fix that, but then... et al.
* The plot of ''Film/StargateContinuum'' centers around the main cast being the only people to know that the timeline has been changed and trying to convince others to let them change things back. The trope is notably deconstructed when SG-1 gets a WhatTheHellHero speech upon suggesting time travel; the issue is raised that this trope requires an OmniscientMoralityLicense to work and that to assume you can go around Setting Right What Once Went Wrong is an act of staggering arrogance as it necessitates changing the lives of millions... of course it always goes FromBadToWorse and they're allowed to do it in the end.
* Viciously subverted by the film ''Film/TheButterflyEffect'', in which every time the main character goes back in time to fix something the [[ButterflyOfDoom titular concept]] conspires to make things ''worse'' for ''everyone.'' This occurs repeatedly with all kinds of nastiness happening along the way, culminating in an inevitable DownerEnding the exact nature of which depends whether you're watching the theatrical release or the director's cut.
* The basic premise of ''Film/{{Timecop}}'', to fix what the baddies are doing in the past and avoid the aforementioned butterfly effect.
* ''Film/Timecop2TheBerlinDecision'': Played with, as both the hero and the villain are trying to set right what once went wrong from their own perspectives. The villain is a WellIntentionedExtremist who wants to be allowed to correct the mistakes of the past, only to be stopped by the time agents because of [[ButterflyOfDoom the possibility of disaster]]. When he proceeds to [[RetGone erase them from history]], the hero goes back to undo his tinkering before he suffers the same fate.
* In ''Film/TheTimeMachine2002'' Alexander Hartdegen's original motive for inventing his time machine is to prevent his fiancee from dying in the park. However, the movie subverts this trope, as his every effort to save her [[ButterflyOfDoom causes her to die anyway from another cause]]. It is explained later that [[GrandfatherParadox were it not for that tragic event, he would never have finished his invention, which would have precluded him going back and saving her.]]
** The explanation is Alexander's own, which he has known but was afraid of admitting to himself. It took [[spoiler:the Morlock leader]] to [[spoiler:pull the knowledge from Alexander's head]] for Alexander to admit it and come to terms with the knowledge.
* The heroine of ''Film/{{Retroactive}}'' finds herself timelooped due to close proximity to an underground time travel experiment. She is witness to a murder, and tries to use the shortish (20-minute?) loop to alter the outcome. Results vary.
* In ''[[Franchise/KamenRider OOO, Den-O, All Riders: Let's Go Kamen Riders]]'', history was accidentally altered thanks to a Cell Medal being left in the past during a fight. This resulted in Shocker defeating the Kamen Riders and conquering the Earth. So the plot of the movie revolves around going back in time to set it right.
* Inverted in the ''Film/FinalDestination'' film series. One protagonist's foreknowledge allows him or her and a group of friends to escape some kind of fatal accident. The rest of each movie is about ''death'' [[BalancingDeathsBooks trying to fix this event]] that "went wrong".
* A core concept of ''Film/BattleForThePlanetOfTheApes'', with Caesar and co trying to stop the EarthShatteringKaboom of ''Film/BeneathThePlanetOfTheApes'' from ever occurring.
* Brazilian film ''O Homem do Futuro'' (''The Man from the Future'') has a guy accidentally going back to the prom that ruined his life, and guiding his past self so things go right. Unfortunately it leads to future where he's a rich jerk and the love of his life hates him, so he again goes back to make sure things go back the way they originally happened (including passing the details on how his date should humiliate him).
* In the film ''Film/SplitInfinity'', financially-minded teenager Amelia Jean falls from a barn loft and wakes up as her own late (by her time) great aunt for whom she was named. She tries to prevent her brother/grandfather from losing everything to the impending Black Tuesday. She succeeds only in [[AnAesop learning a lesson about what's really important]], and setting things in motion that would cause them to be the way they would be by her time. (And quite possibly confusing her great aunt when she returned to her own time...)
* ''Film/{{Primer}}''. The plot involves [[spoiler:Aaron going back in time twice to save Abe's girlfriend, Rachel, from her psychotic ex-boyfriend. Thomas Granger, Rachel's father, is believed to have come back for similar reasons, but we never find out exactly what his motives were.]]
* ''Film/MenInBlack3'' has J forced to travel to 1969 in order save K's life and prevent the conquest of the Earth in the modern day after an alien criminal K arrested in 1969 goes back in time to help his younger self murder K. [[spoiler: K kills the younger version of the alien instead of arresting him this time, preventing it from happening again.]]
* The main plot of ''Film/XMenDaysOfFuturePast'' is their quest to avoid the BadFuture, by sending Wolverine's consciousness back in time in order to stop the events that would lead to the dystopian future.
* In ''Film/RepeatPerformance'', having just [[spoiler:shot her husband]] on New Year's Eve, the protagonist finds herself transported from the wee hours of New Year's Day in 1947 to the wee hours of New Year's Day in 1946. Her reaction to realizing that this has happened is the trope.

* TeresaEdgerton's ''{{Celydonn}}'' books, specifically ''The Grail and the Ring'', have an interesting take on this. Strictly speaking, TimeTravel is not possible. However, FunctionalMagic allows one to travel to the Inner Celydonn, to a shadow of the past, where one can see what really happened if one doesn't try to derail events. This quasi-TimeTravel is used to find out What Once Went Wrong, so that it can be Set Right in the present, thus avoiding any {{Temporal Paradox}}es.
* The ''Literature/{{Caretaker}}'' Trilogy focuses on people from a future where the world's ecosystem has been ruined coming back to the present: the "Turning Point", or the point at which it was theorized to still be possible to reverse the damage done. Their foes, who actually ''like'' the future as it is, also come back, with the aim of speeding up the damage, and ensuring their own victory.
* ''Literature/AChristmasCarol'' has this with ghosts warning of the deaths of both Tiny Tim and Scrooge, which Scrooge then fixes thanks to ScareEmStraight.
-->'''Ghost of Christmas Present''': I see a vacant chair and a crutch without an owner, carefully preserved. If these shadows remain unchanged by the future, the child will die!
* In ''Mergers'' by Steven L. Layne, the titular Mergers must go back in time to make sure that a man named Michael Quinn dies as a young boy.The reason why is that [[spoiler: Senator Broogue went back in time before the Mergers were born and saved Michael from dying, thus causing the creation of a society with only one race.]] Somewhat different from the usual situation, in that usually it is the opposite(them saving the person).
* Throughout the early ''{{Nightside}}'' series, John Taylor [[spoiler: is pursued by the Harrowing, constructs sent from an AfterTheEnd future to kill him before he can begin investigating the Nightside's origins. A bit of a subversion, as it's implied the constructs' creators are motivated as much by bitterness and revenge as a need to avert What Went Wrong; else, they could've just sent someone to ''tell'' John his investigation would kick off an apocalypse, so he'd turn down the case.]]
* The protagonist of Creator/JackChalker's ''Literature/DowntimingTheNightside'' is forced to choose sides in a temporal war. Naturally, ''both'' sides claim to be battling those who would MakeWrongWhatOnceWentRight in order to set right what once went wrong.
** Poul Anderson's ''The Corridors of Time'' has essentially the same plot, with added saga and mythology.
* Elizabeth Haydon's ''Literature/SymphonyOfAges'' is this all over.
* Literature/ThursdayNext's father's intent throughout ''The Eyre Affair''. Whatever else they feel it important to talk about, her father always asks Thursday about the outcome of some major battle. His normal response is to swear and vanish (presumably to the battle he asked about), but the whole thing is [[LampshadeHanging lampshaded]] when he asks about one he asked about earlier in the book, and Thursday exasperatedly tells him that the answer hasn't changed since he last asked, but the actual answer she gives is different.
* This is one of the main plots in RogerZelazny's ''Roadmarks'', which has a road that travels from one end of time to another with off-ramps into various alternate histories. If an off-ramp doesn't get used, it eventually vanishes. The main protagonist, Red Dorakeen keeps trying to run modern firearms to the Battle of Marathon to change the outcome, thus re-creating an off-ramp that will allow him to find his lost home. At one point he sees Hitler, traveling in a VW Bug, “trying to find the place where he won.”
* Creator/DianaWynneJones:
** In ''Literature/WitchWeek'' a cataclysmic event has caused an alternate universe to split off, which is identical to ours in every way except that magic exists and witches are persecuted and burned. In order to merge the universes, the characters have to work out what the cataclysm was, and use their combined magic to change history so the universes will never have split in the first place. As a side-effect, various characters' parents haven't been executed or imprisoned in the new universe.
** In ''Literature/ATaleOfTimeCity'' there's a lot of time travelling, but you can only change the past in an "unstable era". The characters travel three times to the same station platform in 1939 in an attempt to change the results of events, but the results are unpredictable and they never manage to improve the situation. Meanwhile, the changes they cause create greater instability each time...
* Isaac Asimov's ''Literature/TheEndOfEternity'' is based on this trope. A group known as ''Eternity'' exists outside of time, constantly intervening to maintain peace and order. However, [[spoiler:in the end, it is discovered that their constant maintaining of a peaceful world resulted, in the long run, in the extinction of humanity, and the entire Eternity program is prevented from beginning]].
* The capacity for doing this appears in the later books of Creator/PeterFHamilton's ''Void Trilogy''. It turns out that "The Void", a PocketDimension accessible via a giant singularity has a "reset to time X" function built in, accessible to anyone that knows it's there; as is traditional everyone but the resetter forgets the original timeline. (The downside is that the act of rewinding an entire dimension needs lots of energy, and the Void obtains that by expanding and eating a bit more of the surrounding "real" galaxy's mass. This isn't very popular in the real galaxy.)
* Attempted in the novel ''Time And Again'', sequel to ''From Time to Time'' (unrelated to the ''Naruto'' FanFic of the same name). In this universe, time travel to the past is possible for a select few with the proper training. The main character in ''Time and Again'' goes back to 1912 in an attempt to prevent World War 1. He knows that there was a man who went to Europe to negotiate an agreement that could have prevented the war, but the agreement never made it back to the US. He later finds out that this was because the man and agreement went down with the ''Titanic''. His next attempt is to prevent the ship from sinking. Another time agent alters the ship's course the ''tiniest'' bit, so that the ship will miss the iceberg by a few inches. [[spoiler: Turns out that her alteration was what caused the ship to ''hit'' the iceberg.]]
* The premise of R. J. Rummel's ''Never Again'' series of novels is the main characters [[FixFic traveling back to 1906 to undo all the atrocities of the Twentieth Century and]] [[AuthorTract to spread democracy throughout the world.]] [[{{Deconstruction}} It gets a lot more complicated than it seems at first.]]
* Subverted in ''[[Literature/ThePendragonAdventure Pendragon]]'' where Bobby thinks that he setting right what once went wrong by stopping the Hindenberg's destruction, but if he had stopped it, he would have doomed the entire world.
* In Creator/PoulAnderson's Literature/TimePatrol stories, both a villain's motive, and a constant temptation to the members of the Patrol, who can sometimes even pull it off with carefully enough handled TrickedOutTime.
* Dak, Sera and Riq's goal in the children's book and web game series, ''Literature/InfinityRing''.
* In ''Literature/BeforeIFall'', Sam dies in a car crash and wakes up again on the same day. She ends up reliving that last day 7 times in a GroundhogDayLoop, and dying in all but one of them. The book is mostly her trying to figure out how to get out of the loop. [[spoiler: She figures out that she has to stop Juliet from committing suicide.]]
* There is a possibility in ''ASongOfIceAndFire'' that the thousands-of-year-old legend of Azor Ahai - generally interpreted by the current Red Priests of R'hllor as a matter of "even the most awful sacrifice is necessary for the greater good" or ''IDidWhatIHadToDo'' - may in fact turn out to have been this trope all along instead. (After two failed attempts to forge the sword Lightbringer that would defeat the Others, cooling it first in water and then the blood of a beast, the legendary hero tempered it in the heart of his own wife. Who may or may not have been expecting to be sacrificed in this way, or consented to it. Was this a Necessary Sacrifice, or was it a murder and therefore a legendary Wrong that has to be set Right by a modern-day hero finding a different option involving a willing or self-sacrifice?) The author could spin it either way but hasn't written it yet...
* The whole point of [[Literature/{{Dragons}} The Fire Ascending]].
* The German pulp SF series "Perry Rhodan" has used this trope several times. The most significant case is an artificial plague that almost sterilises the whole Galaxy until one of the few survivors travels into the past and prevents its outbreak.

[[folder:Live-Action TV]]
* The TropeNamer is ''Series/QuantumLeap'', whose entire plot is a series of these.
* ''Series/TruCalling'': Tru does this in almost every episode. A number of twists and variations of the trope are also used.
* This was also the plot for the entire ''Series/{{Voyagers}}'' series where Phineas and Jeffrey would travel through time to "give history a little nudge".
* Appears to be the premise of the lamentably late Creator/{{NBC}} series ''Series/{{Journeyman}}''.
** One episode revolves around him trying to undo something he did by accidentally leaving his digital camera in the 70s. He returns home to find that computer technology is decades ahead of what it was (holographic screens and video-newspapers are commonplace), but his son was never born (he was delayed at work due to a computer error), replaced instead by a daughter who was conceived a few days later. Despite his wife's objections, he goes back and fixes it.
** The pilot episode gave a clever twist to the usual formula: Dan initially concludes that the reason he keeps jumping back in time is to prevent Neal Gaines from committing suicide, but in the end he realizes that his real purpose was to prevent him from [[spoiler: committing murder.]]
* ''Series/OdysseyFive'', where a FiveManBand witnesses the destruction of Earth from a space shuttle and are sent back in time five years by SufficientlyAdvancedAliens to prevent it. Although they promise not to change events, each of them can't resist meddling with their past to make it better. For instance one woman who knows her son will die of cancer starts giving him a potentially dangerous preventative drug -- her husband, convinced she's going insane, cuts off her access to the boy. Another character bets on a football game -- the size of his bet leads to other people betting on the outcome, starting rumors that adversely affect the course of the game. Worse, the group have considered the possibility that their own actions might advance in time, or even cause, the destruction of Earth.
* ''Series/SevenDays'' is entirely about this trope: a time machine allows a government agent to go seven days back in time in order to prevent the catastrophe of the week from taking place.
* The main plot of the first three seasons of ''Series/{{Heroes}}'', though this is more of a case of Set Right What Will Go Wrong. Name dropped by Hiro in Season 5's "[=PassFail=]" during his all-in-his-coma-mind-trial, and Mental!Adam/Kensei rightfully points out that he's simply reciting the opening to ''Quantum Leap''.
* Another example of this is the CBC drama, ''Series/BeingErica'', where the majority of episodes were centred around her travelling back to a point in her past where she tries to put right something, she believes, went wrong in her life. Normally it would turn out that actually she needed to learn a lesson from that event and her changes wouldn't help her life that much. [[spoiler: There were also a couple of episodes that varied from this format but stayed true to this theme. One where she was required to make changes to the life of the man sending her back in time, another where she managed to make a huge change in her life by stopping her brother's accidental death. This ended up to make her life drastically different and he still died but at a different time in his life and in a different way. Also, in another episode she had to travel forwards in time to learn about another time traveller's life as the version of him she knew in her present time was actually the past version of his actual self. He was refusing to make the changes he needed to and she had to convince him to make the changes he needed to and return to his own time.]]
* ''Series/{{Angel}}'' {{crossover}} with ''Series/BuffyTheVampireSlayer'', "I Will Remember You."
* ''Series/HerculesTheLegendaryJourneys'' has an interesting variation in the two-part episode "Armageddon Now" when villain Callisto is sent back in time by Hope to kill Hercules's mother to prevent his being born. While this is clearly an example of MakeWrongWhatOnceWentRight, Callisto agrees to commit the heinous act in exchange for the chance to [[spoiler:prevent her parents from being killed by Xena's army.]]
* The first season of the Israeli teen series ''The Island'' features the attempts of an underground group of time travellers trying to prevent [[ApocalypseHow a giant meteor wiping out most of humanity]] in (their) past in 2009 (two years after the series premiered). The second season features the series’ protagonists trying to undo a BadFuture, going back to (what later became) Israel in 1909, and the new BigBad. The third season features the protagonists going to mediaeval times to thwart him again.
* In ''Series/NineNineTimeTravels'', a KoreanDrama, Sun-woo wants to change history and gain revenge against the man who killed his father and ruined his family. Luckily, Sun-woo has nine incense sticks that allow him to travel through time.

* [[{{Ludo}} Ludo's]] rock opera ''Broken Bride'' follows an obsessed scientist, who invents a time machine so he can go back and stop his wife from dying in a car accident. [[spoiler: In the end he decides to get in the car with her on that fateful day.]]

* ''[[VideoGame/ProPinballTimeshock Pro Pinball: Timeshock!]]'' has the player attempting to stop a shockwave of anti-time that will destroy all of reality if left unchecked.

[[folder:Video Games]]
* An elementary tactic in ''{{Achron}}''. Occurs often in multiplayer games as a response to another player [[MakeWrongWhatOnceWentRight screwing with your past]].
* Basically the whole premise of ''VideoGame/{{Daikatana}}'', although the main characters spend so much time screwing around in the mythic past that one could be forgiven for thinking it was otherwise.
* The plot of ''VideoGame/{{Marathon}} Infinity'' in the round-about way.
** This is the premise of the fan-made GameMod ''Marathon: Eternal''. Earth is devastated by an interstellar war, and the hero is sent back in time to ensure that Humanity wins. Avoids a TemporalParadox because the LostTechnology doing the time traveling can also jump between different dimensions - the plan is to create an alternate timeline where Earth isn't destroyed and transport the refugees from the original Earth there.
* We learn in the end of ''VideoGame/ArcTheLad 2'' that [[spoiler: It was the reason behind Arc's father disappearance: he tried to set things right, and failed]]
* ''Franchise/FinalFantasy''
** The whole point of the ''Wings of the Goddess'' expansion in ''VideoGame/FinalFantasyXI''. [[spoiler:In fact, the player's version of Vana'diel was revealed to be the Set Right What Once Went Wrong outcome of the nine Cait Siths nudging the Crystal War into a better direction, until people from the other timeline decided to set wrong what once went right. Leads one to wonder how long the [[NeverLiveItDown Pandemonium Warden fight]] took in the "bad" version of the universe.]]
** The point of ''VideoGame/FinalFantasyXIII2'' is to fix the timeline and help everyone find happiness while averting future disaster. [[spoiler: They fail, and cause a massive TimeCrash.]]
** The TimeCrash that the heroes cause halfway through ''VideoGame/FinalFantasyThe4HeroesOfLight'' allows them to do this. [[spoiler:Visiting all the towns in the past lets them kill the demons that were corrupting or usurping many of the world's rulers through manipulation, plagues, and outright DemonicPossession. It also averts tragic events from their own timeline, like Lilibelle's death.]]
* In ''VideoGame/FireEmblemAwakening'', "Marth" traveled back in time to prevent TheEndOfTheWorldAsWeKnowIt [[spoiler:which was originally set into motion with the death of her father, Chrom.]]
* In ''VideoGame/DarkFall 2: Lights Out'', Parker stumbles into a time portal while investigating the disappearance of some lighthouse keepers, and discovers [[spoiler: both the reason they vanished, and that ''he'll'' be blamed by history for murdering them if he doesn't fulfill this trope]]. Likewise, while ''Darkfall: The Journal'' [[spoiler: doesn't actually involve time travel, it does give the hero a chance to avert What Went Wrong, by foiling a supernatural menace ''in the present'']].
* The overarching plot of the popular ''VideoGame/{{Half-Life}}'' Timeline mod trilogy. Scientists at Black Mesa discovered time travel as a corollary to the dimensional portal technology they were working on... and gave it to the Nazis. Now Gordon must travel to the ends of time and even to parallel Earths to set right what once went wrong and stop the [[StupidJetpackHitler Nazi timeship fleet]], [[spoiler:eventually, after all else has failed, traveling back to Black Mesa a few hours before the Resonance Cascade event to stop the fateful experiment before it even began]].
* Implied in-game and [[WildMassGuessing inferred by fans]] in regards to ''VideoGame/TheLegendOfZeldaOcarinaOfTime'', and also one of the cornerstones of [[ContinuitySnarl the infamous Split-Timeline Theory]]. The whole game deals with Link's efforts kick Ganondorf off the usurped throne of Hyrule ([[NiceJobBreakingItHero which Link was sort of responsible for in the first place]]), which he succeeds at with the help of Zelda and the sages. Then Zelda sends Link back to before all that happened so Link can experience the childhood he was robbed off. Link therefore uses this opportunity to warn Zelda and everyone else of how Ganondorf was planning to steal the Triforce, which leads to Ganondorf being captured and executed. However, [[spoiler:this sets up the plot for ''VideoGame/TheLegendOfZeldaTwilightPrincess'', where Ganondorf survives said execution and is trapped in the Twilight Realm, where he gives Zant the power to usurp the throne of the Twili]]. So things were set right, but they ended up going wrong in a different way.
** The Hyrule Historia book infers to a ''third split'', in which [[spoiler:your game over leading to the creation of the 8-bit era of Zelda games.]]
* In the InteractiveFiction game ''{{VideoGame/Jigsaw}}'', the ''antagonist'' is trying to set right what once went wrong (preventing the assassination of Archduke Franz Ferdinand, for example), while the player character must try to keep history on track. (At least, that's how it starts; then it gets a bit [[AlternateHistory more complicated]].)
* ''VideoGame/RadiantHistoria'' is about a soldier who is given a book called the White Chronicle, allowing him to travel back to certain points in time on his journey to help guide the world to its "correct" history (i.e. one that doesn't lead to its destruction through constantly-expanding desertification). Invoking this trope is required to complete the game. Many other temporal tropes apply at various points in the game, but this trope pops up beautifully in a simple sidequest: a woman is mourning the death of her husband from sickness, saying "if only he'd taken this medicine...". To complete the sidequest, just travel back in time with the medicine and give it to the husband (saying it's from his wife). Both husband and wife will be mystified about how you knew and where it came from, as the wife hadn't told you yet about her husband, but that fixes the future so they both live and are grateful.
* In ''VideoGame/TimeShift'', the BigBad gets the suit that lets him time-travel at will and reshapes the world to his own ideals, so the Hero has to get the toned-down suit and go back after him in order to try to fix things.
* ''VideoGame/{{Singularity}}'' has the main character trying to do this after a time-travel incident leads to [[spoiler:the Soviet Union taking over the world with time-manipulation technology. [[FailureIsTheOnlyOption It doesn't work.]] At best, the scientist who invented the time-manipulation technology takes over the world because of your actions.]]
* ''MillenniaAlteredDestinies'' is built on this trope. You play a human cargo ship captain who is abducted by an alien race called the Hoods and given a timeship with the goal of stopping the hostile Microids from taking over the Echelon galaxy (except that they have already done that in this timeline) and moving on to the Milky Way. To this end, you are to seed four suitable planets with life and help the four different races evolve and deal with various crises. Your ship, the XTM, can go back 10,000 years into the past in 100 year increments. You also have access to the complete history of the four races that, unlike you, doesn't have RippleEffectProofMemory. This means that, as soon as you change something, there is a temporal storm that updates the database right before your eyes. Essentially, you have 2 goals in the game: help the 4 races spread out throughout the Echelon galaxy in equal amounts (defeating the Microids) and have the 4 races reach the technological stage at which they can build replacement parts for your ship's wormhole drive to get back to Earth. Due to the game mechanics, you usually can only accomplish one of these.
** Unfortunately, there is an alternate version of you, who has been recruited by the Microids to stop you. He will randomly show up at any point in the past to destroy one of the races, undoing all your hard work. You can't kill him, just as you yourself can't be killed.
** Interestingly, the creators originally planned to have a NonstandardGameOver if you happen to have screwed up the history of the four races so much that it can't be fixed. Your ship would be destroyed by a powerful temporal storm. Then they realized that this could never happen in-game, and eventually removed that ending.
* The premise of ''VideoGame/DayOfTheTentacle''. Dr Fred sends the protagonist trio back in time to "yesterday" to turn off his Sludge-o-Matic machine, preventing Purple Tentacle's exposure to a mutagen sludge, its Start of Darkness and first TakeOverTheWorld step. Unsurprisingly the travel goes wrong and the adventure unfolds.
* The plot of ''VideoGame/WarriorsOrochi 3'' is mostly this. The game opens up with a gigantic eight-headed serpent called the Hydra [[EverybodysDeadDave killing nearly every member of]] the ''VideoGame/DynastyWarriors'', ''VideoGame/SamuraiWarriors'' and ''Warriors Orochi'' universes save Ma Chao, Sima Zhao, and Hanbei Takenaka. After they [[CurbStompBattle fail an all-out assault on the Hydra]] they are rescued by Kaguya, who sends them back in time and begins this plot.
* In ''VideoGame/BodyHarvest'', Adam and Daisy travel back in time to the first alien invasion, so they can prevent the harvest of the Earth from ever coming true.
* In ''VideoGame/SaveTheDate'', this is your plight.
* In ''VideoGame/DragonBallOnline'' and ''VideoGame/DragonballXenoverse'', the villainous Time Breakers are out to alter key events in ''Manga/DragonBallZ'' history. You, as a member of the [[TimePolice Time Patrol]], must help Trunks correct the changes they make.
* In ''VideoGame/RaidouKuzunohaVsTheSoullessArmy'', [[spoiler:it's the ''villain'''s plan - to introduce future technology to Taisho-era Japan to transform it into a world superpower decades in advance in an effort to stave off the horrifying CrapsackWorld that is ''VideoGame/ShinMegamiTenseiI'' and ''VideoGame/ShinMegamiTenseiII''. Interestingly, despite his plan being smashed to bits, it's implied he did succeed, steering the timeline away from the events of those games.]]
* The plot of ''SeriousSam'' involves the titular Sam going back in time to kill the alien overlord Mental in the year 3000 BC before he can [[spoiler:blow up the Earth in 2038 AD.]]
* Your goal in ''VideoGame/SuperTimeForce'' is to jump through time, correct history's dumb mistakes, and kill stuff that never should have happened.
* It is revealed at the end of ''Videogame/TheWonderful101'' that the GEATHJERK army hails from a future where [[spoiler:humanity has become a galaxy-spanning empire that has destroyed countless civilizations and that they went back in time to stop this from ever happening]].
* This is the basic premise of ''VideoGame/WorldOfWarcraft'' Warlords of Draenor. While we can't actually change what happened to OUR Draneor (getting corrupted and blown up into fragments called Outland) due to this being a parallel timeline...the expansion pretty much represents this for Draenor. The Iron Horde is just an excuse to go there, and they aren't the main threat by the end of the expansion. The Draenei (Maraad especially) see going there as an opportunity to prevent what happened in our timeline from happening again. And indeed, our characters intervene at crucial moments to stop MANY bad events that happened on our Draenor from happening here.
* ''VideoGame/LufiaCurseOfTheSinistrals'' has [[spoiler:NewGamePlus, where Erim/Iris is sent back in time by the Dual Blade in the ending of the first playthrough to ultimately save Maxim and Selan from having to sacrifice themselves on Doom Island]].

[[folder:Visual Novels]]
* This trope is the entire purpose of the game ''VisualNovel/TimeHollow'', where the main character is completely normal except that he can use his "Hollow Pen" to make a window into the past and alter an event.
* The plot of ''VisualNovel/HigurashiWhenTheyCry'' once the protagonists realize that they've [[spoiler: been trapped in a GroundhogDayLoop]] of murder, insanity and betrayal. [[spoiler: Rika and Hanyuu knew from the beginning, and were trying to save the town, but eventually came close to giving up.]]
* ''VisualNovel/SteinsGate'' runs on this trope. The protagonist Okabe voluntarily relives the same couple of hours over and over [[spoiler: as he tries and fails repeatedly to prevent his childhood friend Mayuri's death.]] Then, upon realizing [[spoiler: that doing so is futile, he instead opts to send new messages to the past in order to counteract every previous D-mail that's been sent.]] The series ends with a truly [[MindScrew Mind Screwy]] plan [[spoiler: put together by his future self to physically travel back to the past and save his love interest by fooling his past self into thinking she's dead.]]
* The plot of ''VisualNovel/NineHoursNinePersonsNineDoors'' and ''VisualNovel/VirtuesLastReward'' consists of various attempts to invoke this trope. [[spoiler:When certain humans are subjected to severe emotional trauma, they become 'espers' and gain the ability to jump their consciousness between alternate universes, thus giving in-universe justification to the series' multiple endings. All of the main characters are either espers or being manipulated by espers]].
* In ''VisualNovel/AreaX'', [[spoiler:Livan's wish to save Elcia as a child ended up destroying his timeline and creating multiple worlds, but their instability means that they will inevitably shatter]]. One possible solution is to alter the event that caused this rift--that is, [[spoiler:everyone who was supposed to die back then dies, which is the case in Livan's route]]. In Ferim's route, he carries out a solution where [[spoiler:everyone can survive, via merging the timelines and thus properly creating one world where everyone did live, rather than displacing people into multiple dimensions]].


[[folder:Web Original]]
* The [[http://wiki.alternatehistory.com/doku.php/timelines/the_strangerverse?s=strangerverse "Strangerverse"]] in AlternateHistoryDotCom has its basic premise as this.
** In the ''Literature/UnitedStatesOfAmeriwank'', the traveler came to Colonial America before the American Revolution and gave George Washington a mission to unite the world under the United States to prevent an apocalyptic war.
** Almost all of the Strangerverse stories take as their basic premise that there was an apocalyptic war shortly before 2258, and that a group used prototype time-travel technology to send one person back in time long enough to hand over a few tools to an historic figure and tell the recipient why he is doing so. Just when and where the Stranger travels to, what tools are delivered, and whether the destination was the intended destination provide the -verse part of the Strangerverse.

[[folder:Western Animation]]
* This sets the events of ''WesternAnimation/MegasXLR'' into motion through subversion of the trope. The Human Resistance steals a prototype Glorft mecha, modifies it, and attempts to send it and its pilot back in time to prevent the Glorft from winning the war against humanity. Things don't go as planned, and as a result the Glorft invasion actually happens centuries before it's supposed to. HilarityEnsues.
* The ''Peabody and Sherman'' segments of ''RockyAndBullwinkle'' involve going back in time to correct historical events which have gone wrong.
* ''WesternAnimation/SamuraiJack'': "Now the fool seeks to return to the past, and undo the future that is [[BigBad Aku...]]" Partially subverted in that, within the run of the original series, Jack never ''did'' return to his original time and stop Aku from taking over the world. He's always trying, but he's more often than not just fighting Aku's dystopia and helping people survive. A future [[TheMovie film adaptation]] may play this trope straight. His never returning had more to do with [[ExecutiveMeddling the show being cancelled, though.]]
* This is ''WesternAnimation/TimeSquad'''s mission; to keep the past from unraveling. However, all of these changes are comedic and none ever cause a bad future. They just have to be fixed.
* WesternAnimation/YoungJustice: The mission of [[spoiler: Bart Allen/Impulse]]. Although it originally seems simply to be "save Flash's life" we slowly discover ''just'' how screwed up the future is, mostly due to [[spoiler: an evil Blue Beetle]]. How successful the mission is so far isn't really clear, though...

!!Episode or Character Plots

[[folder:Anime & Manga]]
* In the ''Manga/MahouSenseiNegima'' manga, this is Chao Lingshen's motivation for messing around with her great grandfather's childhood, although whether she had an absurdly complicated {{plan}} set up, or was simply playing XanatosSpeedChess as her alterations made foreknowledge less useful is never made clear. She actually fixed the problem she went back to solve with the changes wrought by her first trip, but later makes a second one to tie up a loose end or two before the CosmicDeadline.
* Subverted in ''DragonBallZ''. Future Trunks also attempts to set right what once went wrong, but he does this in a timeline not his own: since in DBZ every timeline counts as another dimension, any changes made in the current time will not directly effect Future Trunks' past or future. He still wants to help out, hoping to create at least one peaceful world, and to return to his own time strong enough to finally stop what he wanted to prevent.
* A great part of the ''LightNovel/HaruhiSuzumiya'' LightNovels deals with Kyon trying to rectify past events in order not to let Haruhi's powers go haywire. Although he travels back in time mainly to set Haruhi off so that she'd create aliens, time travellers and [=ESPers=], and to fix up the events on December 18th. On that day, there's a point in time where there's 3 Mikurus and 4 Kyons. December 18th was only because of ''Disappearance'', and to fix what Yuki did.
* ''Manga/YakitateJapan'': Kazuma's last bread of the second TournamentArc is so amazingly delicious, it ''[[CrowningMomentOfAwesome sends the judge back in time to]] {{retcon}} [[CrowningMomentOfAwesome his own mother's death]]''.
* This is the goal of ''Anime/YuGiOh5Ds'' BigBad Z-One. However, Z-One is different than most in that he is willing to do anything, [[WellIntentionedExtremist no matter how immoral]] to meet this goal. The plan involved causing Zero Reverse, a disaster that killed thousands, and he was willing to murder anyone whom he felt was in the way. [[spoiler: In the finale, Yusei manages to surprise him completely, summoning Shooting Quasar Dragon as his ultimate card (Z-One had expected "Cosmic Blazar Dragon", the card that the Yusei in his timeline used as such), and in he end, it is heavinly implied that Yusei's is able to prevent the BadFuture using much less drastic means.]]
* Anime/{{Pokemon}} season nine episode 'Time Warp Heals All Wounds' sends May, Meowth and Squirtle back in time to prevent a man unknowingly leaving his pregnant girlfriend. May finds a lost necklace belonging to the woman, but oddly, no real explanation is given for the time travel.
* Towards the end of the first ''Anime/TheSlayers'' movie, Lina goes back in time to help Rowdy defeat Joyrock when he first arrived on Mipross Island, before he became as strong as he was in the present. Of course, this has a horrible side effect from Lina's perspective - since she defeated the demon decades before she was hired to defeat him, she ''didn't get paid''.

[[folder:Comic Books]]
* Rayek from ''ComicBook/ElfQuest'' travels to the ''future'' in an attempt to 'save' his space-travelling ancestors from being thrown back in time and crashing on the planet. Unfortunately, all their descendants currently living on this planet will then cease to exist -- and will never have existed, since their ancestors will never have set foot on the planet in the first place. Opinions about whether or not this is a good thing differ -- he thinks it's good, everyone else thinks it's bad. [[AGodAmI Who cares about other men's opinion anyway.]] He tried to compromise by having the people he actually knew and cared about stay inside the palace, which would protect them from the history-wiping effects... but since this would only save the people standing immediately in front of him, and still wipe out everyone else on the planet, they refused his offer. [[spoiler:When confronted with the choice between annihilating everyone he ever loved, and preventing ten thousand years of suffering, he ends up suffering a BSOD and losing his powers.]]
* In the "Camelot Falls" storyline in the ''ComicBook/{{Superman}}'' comics, a prophetic sorcerer tells him what he needs to do to avert the extinction of humanity years down the line. In a subversion of this trope, Superman refuses to comply, namely because "what he needs to do" involves not preventing the deaths of countless innocents.
* The mission of Samaritan in ''ComicBook/AstroCity''. He actually did set things right before the series started, but now his own time period has [[StrangerInAFamiliarLand changed beyond recognition]].
* Comicbook/{{Cable}} has apparently set as his ultimate goal to set right ''everything'' that went wrong, like preventing [[NamesToRunAwayFromReallyFast Apocalypse]] from waking up. (He then wakes up Apocalypse himself by accident. [[NiceJobBreakingItHero Good job]].)
* Archie's ''[[ComicBook/ArchieComicsSonicTheHedgehog Sonic the Hedgehog]]'' series:
** Silver's personal StoryArc is much the same as in ''VideoGame/SonicTheHedgehog2006'' -- he comes from a BadFuture where the world is all but destroyed, and is constantly traveling through time trying to find a way to undo it, with his only clue being that the betrayal of a member of the Freedom Fighters was somehow key to this disaster. Of course, like his game counterpart he's being advised by a (supposedly reformed) villain, but it wasn't until he decided to talk to the more informed denizens of the present that he figured out who his target was: [[spoiler:Sally Acorn, who had been captured and roboticized by Dr. Eggman and forced to fight her friends against her will.]] Silver did manage to subdue his target, but then the book went into its crossover with [[ComicBook/SonicTheHedgehogMegaManWorldsCollide Megaman]] and the whole thing became an AbortedArc when the series resumed after the crossover thanks to a ContinuityReboot.
** A StoryArc in the early 100's issues involved Knuckles' future daughter Lara-Su attempting to undo her own BadFuture by preventing her father's assassination. Unfortunately, when she got back to her time, she discovered that her mother had lied to her in order to protect her -- the truth was, Knuckles hadn't died, he'd pulled a FaceHeelTurn and was in fact responsible for the BadFuture they lived in. The bright side, however, is that the "present" Lara-Su had visited was the series' main timeline, while her future is an [[AlternateUniverse alternate one]]. So we don't have to worry about our Knuckles switching sides like that.
** The two story arcs intersected, with Silver helping Lara-Su defeat her crazed father. Silver wished Lara good luck as he left to continue his mission.
* In the ''Franchise/StarTrek'' "Time Crime" miniseries, someone screwed up the timeline so that Klingons aren't aggressive warmongers and the Romulan Empire doesn't exist. Despite the positive bits, Kirk and Spock still have to fix everything because the overall outcome would ultimately be a BadFuture. That and, as bad as Romulans are, they don't deserve to be ''erased from time''. In one Tearjerker moment, Kirk realizes that "fixing" the timeline will mean losing his son David (in the real timeline David was killed by Klingons), and he gives his son one final hug before embarking on his trip through time.
* A recurring plot in ''ComicBook/PaperinikNewAdventures''.
** The first time is when the [[PunchClockVillain Raider]] arrives in present-day Duckburg to prevent an experiment with nuclear fusion from [[NuclearHate blow up with half of the city]], and PK (DonaldDuck's superhero alter ego) has to help him fix thing and prevent the TimePolice from [[LawfulEvil stopping him]] while preventing the Raider from using the fixed experiment from charging his dimensional travel device and raid all dimensions (he ends up [[spoiler: discovering a flaw in the device that froze the Raider in all timelines at once until the TimePolice arrested him]] and slowing the TimePolice long enough for them to settle on ruining the experiment in a non-catastrophic way).
** The second time it's discovered that an experiment in the future [[GoneHorriblyWrong created a bubble that would destroy all the time]], and [[TheSyndicate The Organization]] gets Paperinik to free the Raider before sending them to stop the experiment.
*** It's implied that [[spoiler: the mess had been caused by The Organization sending an agent to prevent the experiment and the danger in first place, resulting in the experiment being anticipated and the agent ''causing the experiment to go awry in the attempt to stop it'']]. Being GenreSavvy, one of the leaders of The Organization conceived the plan seen in the story, that ultimately resulted in [[spoiler: Paperinik and the Raider getting the experiment anticipated a little more and cause it to go awry again, but arriving before the forming bubble in time to stop it]].
* In the ''{{Runaways}}'' arc "Dead-End Kids", the kids are ostensibly hired by the Kingpin to steal a device. When the Kingpin tries to collect the device from them, they flee, and in the ensuing flight, they activate the device, which ends up sending them back in time to 1907, where they meet a similar group of runaways, one of whom, Lillie McGurty, hits it off with Victor. [[spoiler: It later turns out that the much-older Lillie McGurty of 2007 was the person who hired them, through the Kingpin, to steal the device and then orchestrated the events that caused them to use it, because Victor was the love of her life and she thought if she could get him to travel back in time again, they'd spend the rest of their lives together. Unfortunately for her, her actions also resulted in a gang war that forced the Runaways to retreat back to their own time, and Lillie's younger self was to go with them.]]
* In the GrandFinale for ''ComicBook/SpiderGirl'', ''Spider-Girl:The End'', May's symbiote-created clone April does this when it turns out that May dying leads to an apocalyptic future where Carnage symbiotes ravage the world.
* The ''ComicBook/UncannyXMen'' storyline "The Last Will And Testament of Charles Xavier" turns into this. As one of Xavier's last wishes, he wants the X-Men to find and help train an Omega-level mutant he couldn't (mostly because he was ''way'' too powerful). Cyclops hunts him and down and attempts to help him alongside Illyana (who is borrowing a past version of ComicBook/DoctorStrange's Eye of Aggamotto) and Emma Frost, only for them to get killed when ComicBook/{{SHIELD}} finds them and kills them. One of Cyclops' students decides to travel back in time and persuades a past version of Xavier to prevent this, who does so by [[spoiler:preventing the mutants parents from meeting, thus negating his birth.]] This also has the effect of removing the original beneficiary of who'd get the Xavier School from [[spoiler:Mystique]] to Cyclops.
* In ''[[ComicBook/{{Convergence}} Convergence #8]]'', [[spoiler:With the death of Deimos at the hands of Parallax, all the temporal energies of the time travellers that Deimos had absorbed were loose, and threatened to make the planet Telos into "the bullet that will destroy the multiverse". To fix this, survive and hopefully return to what he used to be, and to undo the destruction of the Convergence worlds, Brainiac tries to give the loosed temporal energies back to the survivors to restore their worlds. However, the ''ComicBook/CrisisOnInfiniteEarths'' event prevents him, so he has to send Barry Allen and the pre-Crisis Kara Zor-El back to their deaths... then Parallax decides he wants to go, that he wants redemption and be a hero and ''Post-Crisis Superman, Lois Lane and their son join him''. The end result? ''Crisis on Infinite Earths is undone and the multiverse is restored in full.'']]
* ''ComicBook/AndersonPsiDivision'': When Anderson finds herself in a young woman's body on Deadworld before its destruction, she tries to prevent the rise of the Dark Judges by stopping Judge Death's transformation into an undead monster. [[spoiler:She fails completely after Death is tipped off by a mole within the resistance.]]

[[folder:Films -- Animated]]
* ''Disney/MeetTheRobinsons'': After the villain, [[spoiler:the future version of Lewis's roommate Goob]], goes back and creates a BadFuture, Lewis has to repair the time machine and recreate the happy future again. Then, at the end, [[spoiler:he prevents the event that made Goob hate him in the first place]].

[[folder:Films -- Live-Action]]
* In ''Film/GalaxyQuest'', the "Omega 13" device is used to go back 13 seconds in time, "enough to change a single mistake".
* In the conclusion and epilogue of ''Film/{{Jumanji}}'', Alan prevents Carl Bentley from getting fired (or gets him re-hired), and the kids' parents are stopped from going on their fatal ski trip.
* This is the main plot of ''Film/StarTrekFirstContact''. The past is going perfectly fine until the Borg try to set wrong what once was right.
* This is the main plot of Film/MenInBlack 3. Specifically, the villain successfully executes a MakeWrongWhatOnceWentRight plot (which ultimately leads to an alien invasion in the present), and Agent J has to go back in time to undo it.

* ''Literature/{{Animorphs}}'':
** In ''Elfangor's Secret'', the team is sent back to prevent Visser Four from changing key events in the past. [[spoiler: Unfortunately, those changes were much more far-reaching than either side anticipated, and would've prevented the Holocaust, though likely still making a worse future. So in order to [[ResetButton return the present to normal]], the team has to [[ShootTheDog essentially condemn millions to death]]. Eventually they decide on paradoxing out the events of the novel, deciding that at least this way it happened naturally.]]
** In ''In the Time of the Dinosaurs'', they must sabotage a nuclear device and sacrifice an entire colony of aliens, or else the Cretaceous Era won't end on schedule.
* In the novel ''SoonIWillBeInvincible'', Lily gets sent back in time to prevent a blight from wiping out humanity, but after she succeeds she decides she liked the blighted future better and becomes a supervillain to try to bring back her original future. However, this turns out to be an outright lie -- she's a native of the current time period, although the era she claims as her origin really ''is'' a possible future that she has visited -- and she ends up using it to trick another supervillain into saving the world.
* In the [[Literature/HarryPotterAndThePrisonerOfAzkaban third Harry Potter book]], Harry and Hermione have the chance to go back and save two innocent lives.
* DeanKoontz's ''Lightning'' [[spoiler:features a time-travelling protagonist who goes back to his own time, after having thwarted a Nazi Time Travel plot, and tells Winston Churchill about the Cold War. When he returns to the future, The Cold War never happened, as the Allies kept on pushing eastward after the Nazis surrendered, defeating the communists before the Cold War ever started.]]
* The short story "[[http://mightygodking.com/2009/11/10/scenes-from-an-alternate-universe-where-the-beatles-accepted-lorne-michaels-generous-offer/ Scenes From An Alternate Universe Where The Beatles Accepted Lorne Michaels' Generous Offer]], shows us what would have happened if Music/TheBeatles had reunited on SaturdayNightLive. [[spoiler:Turns out Ringo's a rather inexperienced {{Time Travel}}er.]]
* This is Charles Wallace's mission in ''ASwiftlyTiltingPlanet'', as the Echthroi have created a Might-Have-Been (a hypothetical timeline that is in the process of supplanting the true timeline) where the world is destroyed by nuclear war. He must discover the source of the chain of events that leads to humanity's destruction and put it right.
* ''Literature/SixtyEightRooms'': [[spoiler: Sophie's diary changes after Ruthie and Jack meet her]]

[[folder:Live-Action TV]]
* Naturally, ''Series/{{Life On Mars|2006}}'' and ''AshesToAshes'' have played with this: in Sam's case, it was finding out why his father abandoned him, as well as arresting the serial killer who'd kidnapped his girlfriend and a crime lord who'd had a witness in his custody murdered; in Alex's, it was preventing her parents' death by car bomb. Their success rates are... varied; Sam eventually wound up ''convincing'' his father to skip town, because there was that little matter of a murder and racketeering charge if he stayed...
* ''Series/DoctorWho''
** This doesn't work in the Whoniverse all the time. The Series 1 episode "Father's Day" establishes that some points in time can't be changed (known as fixed points, they are usually major historical events but they could be more personal ones) without causing disaster, but other points are in flux and can be changed to varying degrees.
** Amy gets a chance to do it in a small way in the Series 5 finale -- not by time travelling, but because [[spoiler:the universe is being rebooted from her memories, so if she remembers something the way it was, she can have it back]].
** Not-quite-subverted in "Genesis of the Daleks". The Time Lords send the Doctor back in time to the creation of the Daleks, with the goal of either preventing their creation, or at least making them less aggressive. While there, the Doctor is captured by the Daleks' creator and is made to detail every Dalek vulnerability he knows about. Being the universe's resident expert on fighting Daleks, this would have been a catastrophe had he not [[NoPlansNoPrototypeNoBackup destroyed]] the tape before leaving the scene.
** Possibly subverted in "Resurrection of the Daleks", where the Daleks used the Doctor's interference in their creation to justify an attack on Gallifrey.
** Creator/RussellTDavies' view was that this Dalek-Time Lord skirmishing eventually led to the Time War of the new series, thus subverting the trope. Alternatively, this could be playing the trope straight, as the Time War may actually be a ''better'' outcome than what the Time Lords originally predicted.
** [[Recap/DoctorWhoS32E10TheGirlWhoWaited "The Girl Who Waited"]] deconstructs this, in part. Amy gets trapped in a hospital that runs on NarniaTime, causing Rory arrive thirty-six years later, during which time she's been [[FutureBadass fighting robots]] with no living company. There's an opportunity to set things right, but Amy is not on board:
--> '''Amy:''' He wants to rescue Past Me from 36 years back, which means I'll [[RetGone cease to exist]]. Everything I've seen and done dissolves, time is rewritten.
--> '''Rory:''' That's... That's good, isn't it?
--> '''Amy:''' I will die. Another Amy will take my place, an Amy who never got trapped at Twostreams, who grew old with you, and she, in 36 years, won't be me. ([[spoiler:At first, it seems she's WrongTimeTravelSavvy, but the truth is slightly more complicated, along the lines of NeverTheSelvesShallMeet.]])
** This how the Monk in The Time Meddler sees his own actions: that by reversing the outcome of the Battle of Hastings, he would ensure that England gets a better king -- Harold -- than the one it actually got -- William. The Doctor, however, is outraged by the sheer recklessness of this action.
** The Series 9 opening two-parter "The Magician's Apprentice"/"The Witch's Familiar" hinges on the Doctor getting a chance to fix a huge mistake he made: [[spoiler: abandoning a young, frightened Davros -- who would create the Daleks as an adult -- on a Skaro battlefield instead of saving his life, which likely started him on the path to evil]]. The problem is, ''how'' will the Doctor fix the mistake at a point when he has nothing to lose: [[spoiler: save him and risk the Daleks, or kill him and risk his own soul and the universe's stability]]?
* In the ''Series/MirrorMirror'' series, there is exactly ''one'' person who was trained to do this exactly ''once'', as revealed in the final episode. Everything prior to this point had already happened in her mentor's past.
* In ''Series/BabylonFive'', this is a key point in the 5 year plot -- instead of "Sometimes, trying to set right what once went wrong is what [[YouAlreadyChangedThePast sets everything wrong in the first place]], resulting in a StableTimeLoop.", everything will go wrong unless the heroes go back to keep what's right, creating a StableTimeLoop by altering the past to what it is. Which gets really confusing if you try to ask, "What happened the first time?". There are a few hints via dreams and a broadcast. It's said the Shadow's army would have been three times larger and more prone to act directly earlier.
* More of a case of "Set right what we messed up" but in an episode of ''Series/HannahMontana'', Miley and Jackson travel back in time and mess up their parents meeting. Cue a back to the future style disappearance for Jackson as Miley tries to set things right. It was probably AllJustADream.
* Done in ''Series/PowerRangersTurbo'', with heavily debated success. A robot, the Blue Senturion, came from a thousand years in the future to warn the heros about a war two years later... and was intercepted by the villains, who took the message, and deleted it from his memory. Not only did the war still happen, but it happened a year earlier than scheduled. On the one hand, an all-out win for Team Evil was averted, but on the other, [[Series/PowerRangersInSpace it still didn't]] [[HeroicSacrifice end very]] [[BittersweetEnding happily]].
* This is Desmond's major character motivation throughout the third season of ''Series/{{Lost}}'' (apart from his desire to be reunited with his lost love Penny).
* ''Series/{{Farscape}}''
** Subverted in episode "Different Destinations," where the team go back in time to a historic siege and make things ''worse'' by getting everyone except them killed.
** Played straight in "Kansas" when the team accidentally goes back to Earth in 1985 and has to prevent John's father from going on the "Challenger" shuttle to prevent his death and John possibly never ending up on Moya.
* Guinan of ''Series/StarTrekTheNextGeneration'' is practically this trope walking personified (as for reasons that were never even hinted at until TheMovie, changes in the timeline do not affect her), especially in "Yesterday's Enterprise". More technically they don't entirely affect her. She could identify something was wrong, but didn't know what could have caused it.
** In "Tapestry", Q gives Picard the opportunity to avoid a BarBrawl in which he suffered a near-fatal wound to his heart, leading to getting an artificial heart that failed him in the beginning of the episode. [[ForWantOfANail Picard however finds that not being in the brawl drastically changed his future, as he's not a legendary captain, but a lowly lieutenant.]]
* The iconic ''[[Series/StarTrekTheOriginalSeries TOS]]'' episode "The City on the Edge of Forever": We see what's happened when [=McCoy=] goes through the Guardian: Edith Keeler starts a revolution, causing the Germans to win WWII, causing havoc and destruction throughout the timeline. Kirk and Spock must enter and make sure Keeler dies like she's supposed to. Of course, a little thing called love gets in the way...
* ''Series/TheOuterLimits1963'' episode "The Man Who Was Never Born". A mutant from a devastated future goes back in time to prevent the biological disaster that destroyed civilization.
* ''Series/TheOuterLimits1995'':
** In "A Stitch In Time", a scientist develops a time machine and uses it to go back and [[SerialKillerKiller kill serial killers before their first murder]]. However, it turns out she was motivated by the fact that she'd been raped and tortured by a serial killer herself as a child. She eventually goes back and kills ''him'', thus saving her younger self, but this undoes all of her other killings, as she would have had no motivation to kill them in the first place. She also dies while killing him. However, her younger self realizes that time travel is possible and uses it to re-invent the technology. In the double ClipShow "Final Appeal", she uses it to help people ([[spoiler:she dies when another time traveler blows up Washington, D.C., in the future]]).
** In "Decompression", a popular presidential candidate traveling on a plane and seeing an intangible image of a woman claiming to be from a BadFuture where his plane crashed (because of another time traveler's accidental interefence), and his ineffectual opponent ended up winning. She convinces him to jump out of the plane by claiming that she will use future technology to halt his fall moments before hitting the ground. This appears to happen, but then she explains that she is here to kill ''him'', as he is the one who will become PresidentEvil due to his paranoia. The falling scene repeats, and nobody catches him this time. The plane lands without problems.
** In "Patient Zero", a time-traveling assassin killing certain people with a fast-acting poison before the strains of viruses they're carrying can combine in Patient Zero and start a pandemic that will kill most of humanity. Each time he goes back and is told that nothing has changed. He eventually realizes that he has to kill Patient Zero, who turns out to be a pretty woman, and he hesitates, resolving to prevent her from contacting the people with the strains. At the end of the episode, a colleague of his goes back in time and explains that the ''assassin'' is the one who is now Patient Zero, as his attempts to keep her away from the infected resulted in him creating the plague within himself. He voluntarily lets himself be poisoned in order to keep his future family safe.
* ''Series/{{Supernatural}}'':
** In "In The Beginning", Dean ''thinks'' that his jump into the past is to set right what once went wrong (Castiel all but states it outright), but not only does it turn out he was only meant to ''witness'' what went wrong and not change it, it sure looks like he actually ''caused'' it.
** "The Song Remains The Same" had an angel go back to that time to try to kill their mother before they were born. While she seemingly succeeds in killing their father, he is brought back as a vessel for Archangel Michael, who kills the angel.
** In "As Time Goes By", Henry wants to return to 1958 to stop Abaddon and be a father to John, but Dean fears that it'll have an unforeseen consequence and stops him by force. Although even Dean is taken aback when Henry points out that his return would mean that the Apocalypse and all the other [[SealedEvilInACan sealed evils]] that have killed thousands of people would never have been released.
* ''Series/StargateSG1''
** Subverted in "The Gamekeeper": Jack and Daniel ''think'' that they're being sent to the past to fix mistakes in their lives, but it turns out that they're just mentally reliving them, not really time travelling, and there's no way for them to fix it anyways.
** Played straight in the Aschen arc, in the episodes "2010" and "2001". The former takes place in a BadFuture, where the Aschen, posing as benevolent aliens, infect Earth with a sterility vaccine that will eventually cause its population to die out. To avert it, SG-1 sends a [[NoteToSelf note to their past selves]] back in time, leading to a less tragic future.
** Played straight in the two-parter "Moebius" when an attempt to go back in time to retrieve a piece of technology results in screwing up the timeline and having to go back in time again to fix it.
*** Not necessarily. It's not made clear if it was SG-1's interference that made Ra leave with the stargate or if that was what originally happened.
** Also played straight in the movie ''Continuum'' as listed in the "Films" section.
* The ''Series/StargateAtlantis'' episode "The Last Man" has Sheppard thrown 48,000 years into the future, where a program Rodney left behind recounts a long FromBadToWorse story of the intervening years and arranges to send Sheppard back to fix everything. He even gives Sheppard some crucial information, like Teyla's location at the time, so Sheppard can change what happened for the better.
* ''Series/TheXFiles'' episode "Synchrony" presents the case of a strange old man warning an MIT student and professor that the student is going to die at a specific time -- because of this warning the professor, attempting to save the student, ends up accidentally pushing him into the path of an oncoming bus and thus the warning is a SelfFulfillingProphecy. The old man is [[spoiler: actually the professor from the future, who has traveled back in time]] attempting to Set Right What Will Go Wrong and prevent an impending scientific breakthrough [[spoiler: that would be made by the professor in collaboration with his girlfriend, also a scientist, and the student, and which would be a catalyst for a catastrophic technological development.]] Mulder cites an old theory of Scully's about how YouCantFightFate, and so the old man's efforts are probably doomed. [[spoiler: Although the professor manages to kill both his present and future selves and erase all of his files, as the episode ends, the girlfriend is continuing the research on her own with backups of the erased data.]]
* The conclusion of the ''Series/StarTrekVoyager'' "Year of Hell" serial. Or for that matter, the conclusion to the series altogether.
* In an episode of ''Series/TheFlash1990'', Barry Allen is accidentally thrust 10 years into a future where Central City has been taken over by his brother's killer, Nicholas Pike, and where an underground group of citizens were waiting for [[SecondComing the Flash to return]] in order to set things right.
* ''Series/KamenRiderDenO'' touches on this occasionally, in the context of "You are not supposed to do this".
** Kintaros nearly gets kicked off [=DenLiner=] in one episode when he tries to change a girls past for the better instead of dealing with the MonsterOfTheWeek (who was damaging the timeline himself in the meantime).
** Although it seems perfectly okay for them to change history in some cases but not in others. In one early episode, our heroes help a struggling musician make it to a gig which he had missed in the original timeline. He's convinced that had he not missed this gig, he'd be a star in the present. Turns out he's still a nobody even after they change history; the only difference is that he no longer blames himself for the breakup of his band. Since the change was so unimportant, our heroes are informed that what they did was okay.
** What the previous two events have in common is that the change prevented the [[MonsterOfTheWeek Imagin]] from making a DealWithTheDevil with that person in the first place. While Singularity Points negate ''some'' of the damage caused by an Imagin to the past, they only negate damage to things that were part of their memory and some things are lost for good. So completely negating the rampage ''better'' preserves the timeline than simply destroying the Imagin in the past, even if it requires a minor change. Strangely, this ''doesn't'' negate the fact the Imagin was destroyed though...
* In the NonSerialMovie of ''Series/KamenRiderKiva'', ''King of Hell Castle'', Wataru goes back in time in order to prevent a prison inmate from discovering the ruins of an ancient demon race and becoming their king. Unfortunately, his actions don't make any real difference, and in fact may have made it worse, given that when he returns to 2008, the creatures are roaming freely and the moon is covered by a gigantic monster eyeball.
* In ''{{Primeval}}'', Matt spends the majority of season four and five doing this to prevent a BadFuture. [[spoiler:Although, as he doesn't know exactly what went wrong, and doesn't find out what went wrong until halfway through season five, he spends most of the time tracking the wrong person and helping prevent a bad present.]]
* The ''Series/MysteriousWays'' episode "Yesterday" deals with a police officer who relives the previous day after accidentally shooting and killing his partner and praying for some way to make it right.
* There was an episode of ''{{Roswell}}'' where a Max Evans from the future uses the Granilith to travel back to the present to break up his past self and Liz, because by staying together it results in all their deaths at the hands of their enemies, 14 years from now.
* In the second part of ''Series/TheFlipsideOfDominickHide'', "Another Flip For Dominick", Pyrus convinces himself that is what he is doing when he steps into history to foil a kidnapper. This forces Dominick to pursue him back and stop him before he completely screws things up.
* A late episode of ''Series/KaizokuSentaiGokaiger'' has Domon of the Series/MiraiSentaiTimeranger recruit the pirates to go back to 2010 to protect a shrine to obtain a Greater Power. This was used to pull an AuthorsSavingThrow concerning the team's appearance in ''Series/TensouSentaiGoseiger vs. ''[[Series/SamuraiSentaiShinkenger Shinkenger]]''. They complete the mission, but realize they didn't get the power. The shrine becomes a ChekovsGun as it holds [[Series/NinjaSentaiKakuranger the missing Ninjaman]].
* ''Series/TwelveMonkeys'': Cole's mission throughout the series is to somehow prevent the release of the plague in 2017 that decimates most of humanity and brings the species to the brink of extinction by 2043.
* Two episodes of ''Series/SeaQuestDSV'' involve TimeTravel and plots to fix the timeline. In the first case, the submarine is brought to a BadFuture, where a plague has wiped out most of humanity, with the rest of the people staying at home and playing video games using real HumongousMecha. By the end, only two humans are left in the world (the rest are killed by the "video games"): [[AdamAndEvePlot a boy and a girl]]. The AI controlling the world brings the ''[=seaQuest=]'' crew to the future to try to get the survivors to repopulate the species. However, to do that, they need to [[spoiler:remove their dependence on the very same AI by shutting it off permanently]]. As [[TeenGenius Lucas]] [[TimeyWimeyBall tries to explain]], the way time works is that the future and the past are in a StableTimeLoop of sorts, and, by saving the future, they're ensuring their own past.
** The second example has a reactor instability result in a [[NegativeSpaceWedgie Negative Sea Wedgie]] sending the sub into the middle of the [[UsefulNotes/HistoryOfTheColdWar Cuban Missile Crisis]]. Or, rather, the first time jump has the sub arrive days after the crisis goes apeship, and the superpowers nuke the world. They find a lone yacht at sea with a naval officer dying from radiation explaining what went wrong during the crisis. The sub then jumps back a few days and tries to ensure that events are put back on course as they remember from their history lessons. Specifically, an American sub ends up being out of position and assumes that a Soviet ship has already crossed the line, when, in fact, it's miles away from it. The attack on the ship would've started WorldWarThree. The ''[=seaQuest=]'' manages to intercept the torpedo and uses the command codes provided by the same officer to order the US sub back in position.

[[folder:Web Animation]]
* ''Machinima/RedVsBlue'' uses the StableTimeLoop variety of this trope. When Church is blasted into the past by a nuclear explosion, he uses the opportunity to try correcting each disaster that has occurred in the series up to that point. Of course, it turns out he's the cause of most of them, including his CO's mysterious heart failure, numerous injuries to his teammates, and his ''own'' accidental death ("Oh my god! ''I'm'' the team-killing fucktard!"). When his every attempt to prevent the bomb from going off fails, he eventually gives up, makes sure a copy of himself is blasted into the future with his teammates, and delivers a bitter {{Aesop}} about accepting reality as it is.

[[folder:Tabletop Games]]
* The notorious ''{{Champions}}'' module "Wings of the Valkyrie" combines this and the Hitler exemption and setting things wrong: the player characters need to travel back in time to save Hitler; a previous traveller had ensured Operation:Valkyrie's success, expecting this would cripple the Reich. It didn't work; the Reich's new leadership was just as evil, and much more capable.
* The ''TabletopGame/{{Ravenloft}}'' boxed-set adventure "Castles Forlorn" sends the heroes to a haunted castle which shifts repeatedly between three time periods. They have the opportunity to free an imprisoned woman while in the second of these eras, which causes corresponding historical changes to the third.
* The ''TabletopGame/{{Eberron}}'' sourcebook "The Forge of War" suggests this as a basis for a Last War campaign, in particular suggesting an outline where a group of war criminals escape Dreadhold and go time-travelling through a magical portal, resulting in all kinds of chaos which the characters have to set right.
* The plot of the ''MagicTheGathering'' block ''Khans of Tarkir'' involves Sarkhan Vol trying to prevent the death of a powerful dragon planeswalker a thousand years ago. He succeeds, and inadvertently also revives Tarkir's previously-extinct dragons. Sarkhan loves dragons, so he's over the moon about it; the humans of the plane end up enslaved by said dragons, [[MakeWrongWhatOnceWentRight arguably in a worse position than before he left]].

[[folder:Video Games]]
* In ''VideoGame/CityOfHeroes'', several factions are attempting to do this, but their concepts of "right", usually focusing on self-preservation, are often mutually exclusive.
* In ''VideoGame/ChronoTrigger'' the characters end up warped to AfterTheEnd and, upon watching a video of The End itself, resolve to stop it happening. They only have one chance because, well, they die if they don't do it right. Also a rare example where the TemporalParadox part of succeeding is actually acknowledged; a paradox is caused because the heroes learn of the end from records ''after'' it happens, and then alter the future so the end which produced those records never comes into being. VideoGame/ChronoCross is essentially an entire game about a whole cornucopia of consequences resulting from this, [[FromBadToWorse none of which are pretty]].
* The world of ''VideoGame/DragonQuestVII'' used to be a vast and expansive place, but by the time of the game, it has been reduced to a single continent. Your party's mission is to travel back in time to the continents which once existed in the past and stop the various disasters which destroyed them, thereby causing them to reappear in the present.
* In ''VideoGame/DarkCloud 2'' you had to restore various points in the future that were destroyed in the past by the BigBad.
* Kain's motivation during the later ''VideoGame/LegacyOfKain'' games is to fix the ruined world ''he himself created'' by traveling through time, although the plot is so complex and nearly every member of the cast is such a conniving manipulator that the importance of this, while not lessened, is somewhat drowned out. The rules of time travel in this setting make this goal even harder than it usually is; normally, YouCantFightFate and going back in time will merely cause a StableTimeLoop, but real alterations can be made by ''deliberately causing a TemporalParadox'' and then acting inside of its effect. [[spoiler:Raziel is thus the only being in all of creation with true free will because he is a ''living'' Temporal Paradox. A paradox that is resolved in the end when he willingly sacrifices himself to the Soul Reaver.]]
* Used in ''VideoGame/SonicTheHedgehog2006'':
** In Sonic's story, he eventually ends up time-traveling to a BadFuture, and discovering that it was caused by the death of Princess Elise, very shortly after the date that Sonic had just left. Sonic travels back to rescue her.
** In Silver's story, Silver is a native of the aforementioned bad future; he travels to the past (i.e. Sonic's time) intending to kill the "Iblis trigger" and prevent Armageddon. However, he thought that ''Sonic'' was the Iblis trigger--because Silver's source of information about the past was manipulating him into [[MakeWrongWhatOnceWentRight Making Wrong What Once Went Right]].
* The plot of ''RatchetAndClankFutureACrackInTime''. [[spoiler:Subverted in that it turns out to be impossible and/or will only result in tearing the universe apart.]]
* In ShatteredHourglass these are actually [[KarmaMeter Karma point]] events. The protagonist [[TimeMaster Duran]] can interact with the lifeforce of a dying person, or reach into one's memories to access the past itself.
* In ''VideoGame/TheLegendOfZeldaOcarinaOfTime'''s ending, Zelda sends Link back to the beginning of the game so he can avoid his NiceJobBreakingItHero moment. Rather than changing the future they're in, it creates a second time line. The timeline where Link sealed Ganon away now lacks a hero to take care of him, and the gods end up ''destroying hyrule in a Great Flood'' for lack of any other option. And the other timeline, where Link didn't lead Ganondorf directly to the triforce? Ganondorf ends up with 1/3 of it and gets sealed away ''anyway''. Net result of attempt to set right what once went wrong: one timeline in exactly the same situation that they were trying to prevent, and one timeline ''utterly destroyed''.
** ''VideoGame/TheLegendOfZeldaMajorasMask'' begins with Link dumped into an alternate reality, [[BalefulPolymorph unwillingly transformed into a harmless Deku Scrub]], and forced to watch helplessly as the world around him goes to hell in a handbasket before its eventual destruction at the end of the third day. Then Link goes back in time, regains his true form, and relives the same three days [[GroundhogDayLoop over and over]] as he gradually meets and helps everyone the BigBad has hurt, until he is finally strong enough to stop it all from happening.
* The entire plot of ''VideoGame/MortalKombat9'' centers around an attempt to do this. Shao Kahn ends up winning the events of Armageddon, leading Raiden to send a message back to his past self to try fixing this. [[spoiler: He ends up nearly bungling the whole thing. In the end, every single one of the Forces of Light save for Johnny Cage, Sonya, and himself are dead, their souls taken by Quan Chi. Shao Kahn is defeated, averting THAT particular Armageddon event, but Quan Chi has an army of powerful souls at his command now, and the ending implies that Shinnok and the Netherrealm are preparing to attack next...]]
* Deconstructed in Episode 4 of the ''VideoGame/BackToTheFuture'' games, where [[spoiler:Citizen Brown doesn't like the idea that setting right what once went wrong means that the prudish Edna Strickland goes on to be a miserable old CrazyCatLady in the proper timeline, choosing instead to find a way to make sure that Young Emmett Brown ends up with Edna without her becoming a KnightTemplar by making sure that he never develops his passion for science]].
* VideoGame/{{Riven}} has a non-time-travel variant as the framing device. The linking books the series relies on can be used to modify worlds they link to using quantum uncertainty; if it ''could'' have been there but was never noticed before, writing in that it ''is'' there will make it happen. Unfortunately, Gehn, who wrote quite a number of linking books, was not actually very good at writing them, so the same quantum-uncertainty mechanics are causing the Ages he wrote to deteriorate of their own accord. His son, Atrus, is much better at writing them, and thinks he can save some of them using these same quantum-uncertainty mechanics, but some are beyond salvaging. Your task is to go into one of the doomed ones to rescue Atrus' wife and capture Gehn to stop his shoddy linking book writing, while he stays and tries to stall its destruction for as long as possible.
* This is the reason for (most of) the Caverns of Time in ''WorldOfWarcraft''. The Infinite Dragonflight are screwing with history and the [[TimePolice Bronze Dragonflight]] are recruiting mortals to help them out, since they're too preoccupied searching for their missing leader Nozdormu.
** ''Warlords of Draenor'' is based on Garrosh Hellscream traveling into the past of his homeworld Draenor and preventing the corruption of his people by the Burning Legion. It's a very noble concept at face value but Garrosh uses it to turn the orc clans into the Iron Horde and invade Azeroth anyway.
* In ''VideoGame/CommandAndConquerRedAlert2: Yuri's Revenge'', both the Allies and the Soviets in their respective campaigns go back in time to stop Yuri before he can complete his Psychic Dominators.
* In ''[[VideoGame/ANewBeginning A New Beginning]]'', a group of time-travelers from the apocalyptic 26th century try this as part of a last-resort effort called the Phoenix Plan in an attempt to prevent the ecological apocalypse.
* In ''Videogame/BioshockInfinite'' this happens when twice.
** First when [[spoiler: the elderly Elizabeth in the [[BadFuture Bad Future]]]] gives [[PlayerCharacter Booker]] a coded note to give to [[spoiler: young Elizabeth to prevent the destruction of New York.]]
** The second time is [[spoiler: in the ending when they realize that in the universe where Booker accepted the baptism in the river he was reborn as Father Comstock, and Booker [[HeroicSacrifice lets Elizabeth drown him during the baptism]] to prevent Father Comstock from ever existing.]]
* ''VideoGame/SuperRobotWarsReversal'' gives us an ''accidental'' one. Raul and Fiona Grayden come from a timeline where the [[Anime/MobileSuitGundamWingEndlessWaltz Mariemaia Rebellion]] succeeded and an accident involving either the destruction of the ''[[Anime/MobileSuitGundamCharsCounterattack Ra Cailum]] or the [[Anime/MartianSuccessorNadesico Nadesico-C]] shunts them back five years into the past. During their stay, they get to the moment and have a HeroicBSOD over it. However, they both opt to ScrewDestiny and help out, saving the Anime/{{Zambot 3}} team in the process and leading to the [[Anime/AfterWarGundamX Gundam Double X]] being the one who busts down Mariemaia's bunker instead of Wing Zero Custom falling apart doing so.


[[folder:Visual Novels]]
* Archer in ''VisualNovel/FateStayNight'' attempts to do this by ''creating'' a TemporalParadox. Archer is not so much setting right what went wrong as trying to wipe out all evidence of it ever occurring.
** Saber believes that history went wrong when she chose to take the throne, taking her kingdom's fall as proof of it. Her goal in the War is to undo that choice so her kingdom can be led by a better king.
* In ''VisualNovel/UminekoWhenTheyCry'', Ange's goal in travelling from 1998 to 1986 is to make it so that her brother Battler and the rest of her family can come back from Rokkenjima, where everyone was mysteriously killed. Later she's told that she can only fix Battler's timeline and not her own, but she's determined to help him anyway. [[spoiler:In the end she can't fix Battler's timeline either, since no matter what would happen, everyone would inevitably die during that fateful weekend. Everyone, that is, except Eva and Battler.]]

[[folder:Web Comics]]
* In ''Webcomic/FollyAndInnovation'', Doc Brown has figured out exactly how to create [[http://follyandinnovation.com/2012/08/dont-you-talk-to-me-about-grammar/ a future we can all be happy with]].
* Played completely straight in ''Webcomic/SchlockMercenary'', right down to the "only one chance."
* Inverted in ''Webcomic/{{chainsawsuit}}'', with [[http://chainsawsuit.com/2009/06/10/strip-231/ The Time Ruiner!]]
* Done as part of a ''Film/{{Terminator}}'' homage in ''Webcomic/SluggyFreelance'' when Berk arrives from the future to stop K'Z'K from conquering the world.
* Done in ''Webcomic/GeneralProtectionFault'' in the "Surreptitious Machinations" Arc.
* BadFuture [[spoiler:Dave Strider]] in ''Webcomic/{{Homestuck}}'' uses his TimeTravel ability to try stopping John [[HorribleJudgeOfCharacter from being a gullible idiot.]] It appears to have worked and the protagonists get a lot of [[DiskOneNuke sweet loot from the future]] out of the deal as well.
** This tends to happen a lot in Sburb/Sgurb; time players often have to fix any deviation from the timeline and create a StableTimeLoop.
* ''Webcomic/BugMartini'' shows us that if you attempt to set right what was once wrong, [[http://www.bugcomic.com/comics/crummy-gift/ you risk doing just the opposite.]] You can also use this trope [[http://www.bugcomic.com/comics/breaking-up/ to end a relationship.]]
* Yehuda's motivation for working as a bike mechanic in ''Webcomic/YehudaMoonAndTheKickstandCyclery''. [[spoiler: Not because he's pro-bike, but because he's helping the Shakers after inadvertently destroying their livelyhood.]]
* Late in the course of ''Webcomic/{{Narbonic}}'', Artie and Mell discover a secret tape that was sent from a BadFuture. Future Mell did a host of bad things including becoming vice-president and then having the president assassinated, all so she could use one shot at time travel, even though it would kill her and destroy the universe. Her goal? To save Artie. She thinks that killing protagonist Dave Davenport will fix things. ''And she is wrong.'' [[spoiler: Dave has become unstuck in time and now knows one obscure thing that will allow him to change the future.]]
* In ''Webcomic/BobAndGeorge'', [[http://www.bobandgeorge.com/archives/000503c the Author dramatically announces his purpose]] -- a DeusExMachina to fix the comic.
* In ''Webcomic/ManlyGuysDoingManlyThings'', the "Wrong" is that Commander Badass never got to see a movie starring Sylvester Stallone, Jason Statham, Jet Li, Dolph Lundgren, Steve Austin, Randy Couture, Terry Crews, Mickey Rourke, Bruce Willis, and Arnold Schwarzenegger together at the same time. On his deathbed he sent his future space children back in time with his future space cash so they could make that [[Film/TheExpendables movie]]. In an earlier strip he mentions he went back in time to prevent the Vietnam War, only to later undo his prevention of it, because a world without Rambo is too weird.
* ''Webcomic/DrMcninja'': [[spoiler:Chuck Goodrich]] was sent from the future to stop the zombie apocalypse. Later it turns out that every universe has a [[spoiler: Chuck Goodrich]], and every one of them is always fated to go back in time to stop some disaster. A new one shows up every few months to try to change the timeline, again.
* In ''Webcomics/AutumnBay'', Andrew and Marie-Ange return from a [[VillainWorld hellish]] [[BadFuture future]] with this goal.
* ''Webcomic/HeroesUnite'': This is the origin of ''Titan'' who was sent back in time from the future to prevent the rise of a villain known as ''The Stormfront''. (Titan's origin is shown in the Heroes Unite: Salvation story arc, with the Stormfront arc coming to fruition in Webcomic/{{Energize}}).
* ''Webcomic/{{Oglaf}}'': A wizard does this to cure a plague in hopes of gaining the StandardHeroReward that has been offered for the man who can cure it. Unfortunately for him because the plague now never happened, so he just shows up to [[DidntThinkThisThrough claim a reward that was never offered for solving a nonexistent problem]]. He acknowledges that he wouldn't believe him either. He doesn't get the princess or dukedom, but is offered a "handjob and a hot meal" because they feel sorry for him.

[[folder:Web Video]]
* Caveman's mission [[AnachronismStew to save Cave President Charles Darwin from assassination via Frisbee by Julius Caesar]] in Episode III of ''WebVideo/TheTimeGuys''.

[[folder:Western Animation]]
* ''WesternAnimation/TheFairlyOddParents'', episode "The Secret Origin of Denzel Crocker". Timmy's attempts to stop his teacher from growing up to become a fairy-obsessed maniac result in him lamenting, "[[StableTimeLoop NO! This is exactly what I was trying to]] ''[[StableTimeLoop prevent!]]''" To clarify [[spoiler: Timmy finds out Crocker had fairies (''his'' fairies in fact) in his childhood and was actually quite beloved by the town. But at the ceremony they were throwing for him, Timmy accidentally reveals them to the whole crowd. Granted it wasn't his fault though as Cosmo turned the power to the mics back on in his usual bout of stupidity. And even then the original timeline would've had Cosmo stupidly blurt out their existence anyway. Say the least it all went downhill after that.]] At least he stopped the election of [[RichardNixon President McGovern]].
* The first ''WesternAnimation/{{Futurama}}'' movie "Bender's Big Score" deals extensively with time travel, ending with Bender going back to the year 2000 with the tattoo on the time duplicate Fry's ass to put the tattoo back onto past-frozen Fry's ass in the first place, for any of the plot to make sense.
** In "Decision 3012", it turns out that Earth President candidate Chris Travers is actually from the future, and went back in time to stop Nixon's head from getting re-elected and ruining Earth with his policies. [[ShaggyDogStory However, After winning the election he fades from existence, as his reason for coming back no longer exists and Nixon's head wins by default anyway.]]
* In the '90s ''WesternAnimation/{{X-Men}}'' animated series:
** Bishop traveled from the future to the present ''on three separate occasions'' to prevent a Sentinel-ruled dystopia from coming to pass. On the second trip, Cable travels ''from even further in the future'' to stop Bishop from inadvertently making the far future ''worse''.
** Bishop is terrible at this though, mostly due to his trigger happy nature. His plans to just kill/destroy the source of the problem and then head back to the future never work because he doesn't unravel the conspiracies involved. Fortunately his actions let the X-Men know, and they do manage to fix things.
* ''WesternAnimation/BackToTheFuture''
** "Go Fly A Kite". Verne accidentally interrupts Benjamin Franklin's famous kite experiment, causing the electricity in present day Hill Valley to disappear. Doc and Marty must head back to 1752 and simulate a storm in order for Franklin to make his discovery.
* Played straight in the "OK at the Gunfight Corral" episode of ''WesternAnimation/CaptainPlanetAndThePlaneteers'': Hoggish Greedy & Sly Sludge travel back to the Old West to get the deeds for the Grand Canyon turning it a landfill. The Planeteers follow and work things back on track, returning the Grand Canyon to its natural state.
* ''WesternAnimation/DannyPhantom'' promises not to allow his evil future to come to pass after seeing himself as a sadistic, mass-murdering sociopath. Although Clockwork helps, the subversion comes when it's hinted at the end that it may just be a matter of time after all, if with different circumstances.
* Future Candace travels back in time after she discovers that her meddling with the timeline has turned the tri-state area into a dystopia ruled by Doofenshmirtz in the ''WesternAnimation/PhineasAndFerb'' episode "Phineas and Ferb's Quantum Boogaloo".
* This is the goal of Nox, the BigBad from season 1 of the French cartoon ''WesternAnimation/{{Wakfu}}''. His desire to save the family that he lost 200 years before the show has [[TheDeterminator driven him]] to go from a simple watchmaker to one of the most powerful [[WithGreatPowerComesGreatInsanity (and insane)]] magic users alive. Unfortunately, while he is a skilled enough time mage to [[TimeStandsStill slow time to a stand still,]] he has so far been unable to actually travel backwards in time. He believes that this is [[PoweredByAForsakenChild a power requirement issue,]] and now seeks to drain enough wakfu from the plants, animals, [[HumanResources and people]] of the world to save his family. One character mentions that he has drained entire countries dry over the years, and his current plan involves exterminating an entire race of people to gain the wakfu he needs. Grougaloragran also mentions that [[spoiler:it won't actually work, as time travel is simply impossible no matter how much wakfu he collects, and he'll probably just end up breaking the universe if he tries]]. Nox, however, is [[MoralEventHorizon long]] [[TheUnfettered past caring]]. [[spoiler:Turns out it ''is'' possible. Too bad the wakfu requirements were far steeper than Nox estimated -- the wakfu he spent centuries gathering was only enough to facilitate a ''twenty minute'' time jump.]]
* In ''WesternAnimation/JonnyQuestTheRealAdventures'' episode "The Edge of Yesterday," we learn that Dr. Quest created a time machine program in [[{{Cyberspace}} Questworld]] after his wife died, which would allow him to travel back in time and see his wife again. When he finished it, he realized he wouldn't only be able to ''see'' his wife, he could also change the past to prevent her from dying. His ethics would not let him alter history for personal gain, so he sealed the program so it couldn't be used. Later on, Jonny and Jessie use the program to go back in time and prevent Ezekiel Rage from planting a bomb that could cause the tectonic plates to split, destroying the Earth.
* Two episodes of ''WesternAnimation/LiloAndStitchTheSeries'' centered around this plot. In the first, Lilo embarrasses herself in front of her love interest. She find out Jumba has a surfboard style time machine and used it to fix the blunder, but at the same time theres an experiment running around that Stitch tries to catch and each attempt causes a disaster to the area causing multiple re-dos. Eventually Lilo has to let herself get embarrassed to fix the timeline. The second involves Lilo finding an experiment that can warp time forward, allowing her to age into a teenager and later an adult. However since she and Stitch are time traveling, they're not around to catch experiments. Allowing BigBad Gantu and Hamsterveil to capture them and take over the Earth. Conveniently said experiment has a ResetButton but they have to rescue it first to fix the damage.
* The ''WesternAnimation/CodenameKidsNextDoor'' episode Operation: F.U.T.U.R.E. deals with a future ruled by boy-hating girls who either enslave [[GenderBender or convert any remaining boys]] using technology, with an elderly Numbuh Four being the only remaining male adult. The plot was apparently brought about by the world's ruler through communication with her past self in the present day. The resistance movement gets help from an unlikely source: Numbuh Three's granddaughter, who helps Numbuh Four send a message to the present day Kids Next Door with the information they need to halt the scheme at a vital time, preventing the shift from occurring.
* ''WesternAnimation/FamilyGuy''
** Done as a ShoutOut to ''Back to the Future'', when Peter has Death warp him back in time so he can relive a day in his teenage years. However he does so at a critical moment in the history of his relationship to Lois that ends with her married to Quagmire and him married to Molly Ringwald (its complicated, just go with it). Peter, along with Brian, convince Death to send them back to undo Peter's mistake.
** Also, explicitly referenced in an episode where Peter [[ItMakesSenseInContext becomes a Jehovah's Witness (among other things)]] and explains Jesus like this, leading to a ''SerieS/QuantumLeap'' sight gag.
** And now Stewie and Brian are credited as using this to CREATE THE FAMILY GUY UNIVERSE. LITERALLY. So that's a... set half-right what was elsetime random-in-the-void? It gets played straight in the same episode when Stewie's sperm-brother tries to erase one of his more 'European' ancestors to erase Stewie.
** And in the episode "Christmas Guy" Stewie did this in order to [[spoiler:save Brian from getting hit by a car.]]
* Likewise, sister series ''WesternAnimation/AmericanDad!'' had a ChristmasEpisode that featured a Ghost of Christmas Past trying to pull YetAnotherChristmasCarol on Stan but he uses the opportunity trying to "fix" Christmas by killing Jane Fonda. His guardian angel stops him, but when they get back to modern times America is under the control of Soviet Russia. ItMakesSenseInContext[[note]]Stan also got Creator/MartinScorsese off drugs, which meant no ''TaxiDriver'', which meant John Hinkley Jr. didn't try to shoot RonaldReagan, which meant Walter Mondale gets elected President and immediately surrendered to the USSR[[/note]]. [[spoiler: In a bit of a subversion, trying to fix the original event by making ''TaxiDriver'' doesn't work, so Stan is forced to shoot Reagan himself (which much to his relief is told he just has to "wing him") to fix the timeline.]] Note that even in the end [[CloseEnoughTimeline the timeline isn't the same]]: [[spoiler:Since Stan only shot Reagan, his assistant James Brady was fine which meant no Brady Bill and thus America has less strict gun laws.]]
* [[spoiler: Bart Allen]] from {{WesternAnimation/Young Justice}}.
* In ''WesternAnimation/JusticeLeague'', a two-part episode involves the Justice League being trapped in a [[BadFuture Bad Present]] created when ComicBook/VandalSavage sent a computer back to his past self, giving him the information he needed to depose Hitler and assume control of the Nazis, allowing him to conquer the world. So, naturally, the Justice League have to travel through time themselves to topple Vandal Savage and prevent this from coming to be. Incidentally, the fact that this episode ended with Hitler's impending restoration to power elicited such a massive case of realised FridgeHorror -- that the heroes had implicitly ''restored the Holocaust'' to prevent Vandal's present-era regime -- that [[AuthorsSavingThrow the directors publicly announced]] [[WordOfGod that Vandal's usurpation and cryogenic freezing, combined with when Hitler was released, meant that whilst Hitler went on to lead the Nazis to defeat, he had neither the time nor the resources to spare in directing the Holocaust]].