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18[[quoteright:350:[[Webcomic/{{Wondermark}} https://static.tvtropes.org/pmwiki/pub/images/timecop.png]]]]
19
20->''"The computer which controlled the machines, Skynet, sent two Terminators back through time. Their mission: to destroy the leader of the human Resistance, John Connor, my son. The first Terminator was programmed to strike at me, in the year 1984, before John was born. It failed. The second was sent to strike at John himself, when he was still a child. As before, the Resistance was able to send a lone warrior, a protector for John. It was just a question of which one of them would reach him first."''
21-->-- '''Sarah Connor''', ''Film/Terminator2JudgmentDay'' (OpeningNarration)
22
23Two warriors are sent [[TimeTravel back in time]]. [[SetRightWhatOnceWentWrong One to]] [[MakeWrongWhatOnceWentRight change history]], one to ensure [[TimePolice it takes its established course]]. Or, at least, to prevent the first one from changing things. A game of cat and mouse ensues.
24
25Can also be thought of as EvilCounterpart [[JustForFun/RecycledINSPACE IN TIME!]] If it does not overlap with SetRightWhatOnceWentWrong, it will instead overlap with MakeWrongWhatOnceWentRight: In this case, the historical event in question goes as it originally did in the "good" timeline, and is averted in the "bad" timeline.
26
27Occasionally also occurs with dimensional travel with both the protagonist and the antagonist TrappedInAnotherWorld.
28
29[[TropeNamers Named]], of course, for the ''Franchise/{{Terminator}}'' movies, wherein a [[KillerRobot robotic superassassin]] that [[RidiculouslyHumanRobots looks like a real human]] is sent back in time to pre-emptively kill the future leader of the human resistance in a RobotWar. [[TemporalParadox Paradox schmaradox!]] Compare ScryVsScry, where it's oracles doing this with clairvoyance. For characters who are {{Exp|y}}ies of [[Creator/ArnoldSchwarzenegger Arnold's]] iconic character from ''Franchise/{{Terminator}}'', see TerminatorImpersonator.
30
31----
32!!Examples:
33
34[[foldercontrol]]
35
36[[folder:Anime & Manga]]
37* ''Anime/DragonBallZ'': Cell and Future Trunks, although they come from different [[AlternateTimeline timelines]], and weren't inspired by the other's actions. Trunks came back in order to save Goku from dying, while Cell came back because his timeline's Trunks had killed the Androids (who Cell needed to achieve his [[BishounenLine Perfect form]]) prior to attempting the trip. Oddly enough, because of this they've each killed two versions of the other: Trunks kills the embryonic Present Cell and the Imperfect Cell of his timeline, while Cell kills the Trunks of his timeline and Future Trunks (temporarily).
38* ''Manga/FairyTail'': The climax of the [[TournamentArc Grand Magic Games]] has [[BrokenBird Future Lucy]] and [[FutureMeScaresMe Future Rogue]], though they both come from different [[AlternateTimeline timelines]]. Future Lucy came back to stop Princess Hisui from using the [[PortalToThePast Eclipse Gate]] to kill [[BigBad Zeref]] before he became immortal, [[UnwittingInstigatorOfDoom which would result in an army of 10,000 dragons coming through, devastating the world and killing everyone]]. Future Rogue, however, comes from a future where Future Lucy succeeded, yet [[GreaterScopeVillain Acnologia]] [[AllForNothing took over the world and killed everyone instead]], so he uses the Eclipse to come back ''before'' Future Lucy does to [[MakeWrongWhatOnceWentRight ensure the gates open]] by [[TheManBehindTheMan pulling Hisui's strings]] and killing ''Present'' Lucy to prevent her from getting in the way, thereby giving him an army of dragons with which to kill Acnologia and take over the world.[[note]]Funnily enough, Future Rogue is just as surprised at the existence of Future Lucy as she is seeing another time traveler, as he never learned it was her specifically in his timeline that influenced the gate closing.[[/note]] In the end, Future Lucy [[TakingTheBullet takes the death blow for her present self]], who is able to piece the truth together from the lies fast enough to shut the gate to let only seven dragons through, which eventually leads to the Eclipse being destroyed so the time travelers wouldn't be able to use it in the first place.
39* ''Anime/HugttoPrettyCure'' has the heroic time travelers, Hugtan and Hariham Harry, travel back to the past to prevent the BadFuture they came from which causes them to cross the path of the main heroine Hana Nono. Meanwhile, the evil corporation, Criasu Corp, also travels to the past to try and kill Karry and recapture Hugtan so they can use her powers to enforce the bad future's existence, believing that the only fate humanity is capable of reaching is death and despair.
40* ''Manga/NegimaMagisterNegiMagi'' has a complex version of this: A WellIntentionedExtremist from the future goes back to SetRightWhatOnceWentWrong, bringing her to the storyline's present. Unfortunately, her goals would cause major trouble for the main characters ([[BadEnding turning into an ermine can put a crimp in anyone's plans]]), and she sends them a week forward in time to a future in which she's already won. Good thing Negi can go back in time too...
41[[/folder]]
42
43[[folder:Audio Plays]]
44* The ''AudioPlay/BigFinishDoctorWho'' episode "[[Recap/BigFinishDoctorWho046FlipFlop Flip-Flop]]" has two storylines, each taking place before the other -- with the same characters from each reality crossing over into the other one at the halfway point after going back in time, then going back in time to try and undo what they've done, causing the events in the other reality in the process.
45[[/folder]]
46
47[[folder:Comic Books]]
48* ''Franchise/MarvelUniverse'':
49** [[Characters/MarvelComicsCable Cable]] came back in time to prevent the future he grew up in. Stryfe, his [[EvilTwin evil clone]], then came back in time to stop him -- not so much because he was hugely enamoured of their home era, but rather because he lived to screw with Cable's life. Oh, and then Cable's evil adopted son came back as well... Later ''ComicBook/XMen'' storylines have Cable jumping into the future to protect Hope Summers, a girl he believes will become the [[MessianicArchetype saviour]], while Bishop wants to kill her because in ''his'' original timeline, she becomes TheAntichrist.
50** Slightly less directly, Bishop originally came back in time hunting a group of time-traveling criminals, but then decided to use his new location to protect the X-Men and prevent his home timeline. The criminals he was hunting don't seem overly concerned with this.
51** Then there's the ''Legionquest'' story, which culminates in Professor X's evil son (yes, this is something of a recurring theme for the X-Men) traveling back to the 1950s in order to kill [[Characters/MarvelComicsMagneto Magneto]] before he becomes powerful. An entire ''team'' of X-Men go after him. Between them, [[ComicBook/AgeOfApocalypse they screw things up even worse]].
52** [[Characters/MarvelComicsTonyStark Iron Man]] and [[Characters/MarvelComicsDoctorDoom Doctor Doom]] for some reason do this often. They wind up in Camelot once in ''Doomquest'', and another time they invert the trope by traveling to the future (after Merlin has awakened and King Arthur has reincarnated). Often, though they end up [[TakeAThirdOption taking a third option]] and working together to get back. They do it again in ''ComicBook/MightyAvengers''. It helps that both Doom and Stark have ''nothing'' to gain from changing anything in the specific past periods they enter, and both would rather keep the present they have, seeing as it's dangerous to fuck with reality and all that.
53** In ''ComicBook/AgeOfUltron'', [[Characters/MarvelComicsLogan Wolverine]] goes back in time to kill [[ComicBook/AntMan Hank Pym]] in order to stop the titular robot, while [[ComicBook/FantasticFour Sue Storm]] goes back in time to stop him. [[spoiler:He does kill him, but discovers the alternative is far worse.]]
54** Hilariously, after enough of these stories and BadFuture stories have come and gone, Creator/{{Marvel|Comics}} officially threw their hands up and rendered all of them ultimately pointless by establishing that time travel ''never actually changes anything'' in the time traveler's original timeline, instead creating a whole new alternate timeline running parallel to the original.
55* ''ComicBook/TheNew52FuturesEnd'' is about [[WesternAnimation/BatmanBeyond Terry McGinnis]] going back in time to prevent [[AIIsACrapshoot Brother Eye]] from taking over the world. Naturally, he's followed (some 12 issues later) by a cyborg [[spoiler:who's Bruce Wayne and the Joker stitched together]].
56* ''ComicBook/RoboCopVersusTheTerminator'' has a human sent back to kill the former Alex Murphy before he can grant Skynet sentience, and a Terminator sent back to protect [=RoboCop=] by any means necessary -- whether he wants it or not.
57[[/folder]]
58
59[[folder:Fan Works]]
60* ''Fanfic/DownTheKarmicHole'' has one between [[WesternAnimation/MiraculousLadybug Bunnyx]], who's gone back to the past of the ''Fanfic/TheKarmaOfLies'' timeline to ensure the events don't happen as they did, and [[spoiler:the mysterious time traveling Butterfly user, who instead intends for the timeline to stay ''exactly'' as it is]].
61* The ''Franchise/HarryPotter'' fanfic ''[[https://m.fanfiction.net/s/2570231/1/Fusion_of_Destinies Fusion of Destinies]]'' features a spell that can pull a deadly weapon from the future, but in a form of EquivalentExchange, also brings a person with the knowledge or ability to defeat it. A long time ago, a Goblin rebellion used the spell and got a nuclear bomb along with a technician who gave his life to disarm it. When Voldemort casts it, it brings back [[VideoGame/MetroidFusion the X Parasite and Samus Aran]].
62* In ''Fanfic/HogyokuExMachina'', Ichigo and Aizen are both sent back in time PeggySue-style after a MutualKill; Aizen aims to put his EvilPlan into action again, while Ichigo tries to stop it.
63* A variation shows up in the ''Fanfic/PonyPOVSeries'' [[BadFuture Dark World Series]] in that the twosome are [[spoiler:from two different potential futures. [[BigBad The Nameless Passenger]] is revealed to be Twilight's [[FutureMeScaresMe potential Nightmare self]] Nightmare Eclipse trying to make Twilight become her and continue her GroundhogDayLoop plan while [[BigGood the Benevolent Interloper]] is her potential Alicorn self Princess Amicitia who's trying to help Twilight defeat Eclipse, becoming her instead. Amicitia wins and Twilight then performs her actions to close the StableTimeLoop and locking Eclipse's defeat in stone]].
64* ''Fanfic/QueenOfAllOni'' has an interesting, all-evil version of this pop up in one chapter -- Drago comes back in time to kill [[VillainProtagonist Queen Jade]] for no other reason than to secure his own chance at ruling the world in the future. Karasu, meanwhile, is sent back by the Matriarch (Jade's future self) in order to preserve the timeline. Ultimately, [[spoiler:Drago is banished back to the future and imprisoned by the Matriarch, while Karasu is trapped in the past and imprisoned by Section 13]].
65* Played both ways in ''Webcomic/ShipWarAU'', wherein Elizabeth Butterfly and Jam Diaz, half-siblings with the same father from two alternate futures are sent to the present, and are trying to ensure their own existence [[ShipperOnDeck by playing matchmaker for their parents.]] Subverted later on, as Jam comes from a BadFuture, and is willing to sacrifice his own existence and let Elizabeth's parents get together as long as the apocalyptic event that ruined his world doesn't happen.
66* During one [[BonusMaterial Omake]] in ''Fanfic/WhiteDevilOfTheMoon'', Chibi-Usa attempts to prevent Nanoha and Fate from meeting, with Vivio trying to stop her.
67[[/folder]]
68
69[[folder:Films -- Animation]]
70* {{Exaggerated|Trope}} in ''Anime/BatmanNinja'', with several villains fighting for control of feudal Japan, and Batman and his sidekicks wanting to bring them back to the present and restore the timeline.
71* ''WesternAnimation/MyLittlePonyEquestriaGirls1'' uses the interdimensional travel variety: Sunset Shimmer wants to retrieve the MacGuffin from the [[HighSchoolAU human high school]] so that she can, [[WebVideo/TheNostalgiaCritic you guessed it,]] TakeOverTheWorld. Twilight Sparkle is trying to bring the MacGuffin back to Equestria.
72[[/folder]]
73
74[[folder:Films -- Live-Action]]
75* At the end of ''Film/TwoThousandAndNineLostMemories'', Saigo and Sakamoto end up in the past struggling to avoid or ensure the assassination of Ito Hirobumi.
76* In one of the ''Film/AustinPowers'' movies, when Doctor Evil returns, Austin Powers himself is unfrozen to deal with him. The first sequel plays it straight, with Austin following Evil into the past.
77* ''Film/BackToTheFuturePartII'': A Terminator ''Threesome'' happens when Marty and Doc travel back to 1955 to undo Old Biff's tampering with the timeline. To make this more confusing, it's set at the same time as [[Film/BackToTheFuture1 the first movie]], so Marty and Doc have to avoid that film's younger Marty who's unaware of other time travellers in order not to mess the timeline up further.
78* ''Franchise/BillAndTed'':
79** In ''Film/BillAndTedsBogusJourney'', Rufus follows the robot duplicates of Bill and Ted into the past to try and stop them killing the originals.
80** In ''Film/BillAndTedFaceTheMusic'', the Great Leader sends another robot to assassinate Bill and Ted while she and Rufus' daughter Kelly go back to try and save them.
81* ''Film/CaptainAmerica1990'' with Captain America and the Red Skull being revived in the future.
82* ''Film/DemolitionMan'' inverts the trope, sending two people from the present into the future. One is a psychotic criminal "mistakenly" unfrozen from [[HumanPopsicle cryogenic sleep]], the other is a present-day cop also in cryogenic sleep for a crime he was framed for by said psychotic criminal, unfrozen to deal with someone simply too evil and dangerous for the wimpified future cops to handle.
83* Cassie and Millie in ''Film/FrequentlyAskedQuestionsAboutTimeTravel''. The former travels back in time to [[TimePolice repair time leaks]] while the latter is a time terrorist (they call themselves "editors") who comes to kill our heroes.
84* The PostCreditsScene from ''Film/{{Idiocracy}}'' reveals that Rita's pimp Upgrayedd has also been frozen for 500 years, implying this scenario.
85* A non-time travel example in ''Film/{{Legion}}'' with the Archangels Michael and Gabriel. It follows the same notes because the two of them know the future thanks to their supernatural powers. They are seeking, respectively, to allow or prevent the birth of TheChosenOne who will save humanity after God starts the Apocalypse.
86* Early scripts and the ComicBookAdaptation for ''Film/MastersOfTheUniverse'' reveal that Eternia was an Earth colony in the future meaning that He-Man's gang and Skeletor's mooks were traveling back in time when they came to Earth.
87* ''Film/MenInBlack3'': Boris the Animal goes back in time to 1969 to kill Agent K. Agent J goes back to stop him. J deliberately arrives a day earlier than Boris in order to give himself time to stop Boris.
88* This is technically the explanation for the GainaxEnding to ''Film/PlanetOfTheApes2001'' where Leo gets back to his own time and finds Earth ruled by apes. DVD features explain that General Thade found the other space pod and used it to travel further back and conquer Earth.
89* ''Film/TheSantaClause3TheEscapeClause'' has Scott/Santa and Jack Frost travelling back to the first movie to fight over the previous Santa's coat to see who gets to be the new Santa. It creates a BadFuture where Jack Frost/Santa has monetized Christmas. The second time they go back, Scott manages to hold Jack back, letting his past self get the coat like he did originally.
90* ''Film/TheSmurfs'' has a group of Smurfs transported to modern day New York alongside their nemesis, Gargamel and his cat.
91* A non-TimeTravel example in ''Film/TheSorcerersApprentice''. Dave's first encounter with Balthazar and [[EvilSorcerer Horvath]] in 2000 results in both wizards being trapped in an ancient Chinese urn for 10 years (to the day). Oh, and both are [[AndIMustScream fully awake all this time]]. In 2010, Horvath ends up coming out of the urn about a minute before Balthazar and throws the urn from a window in an attempt to stop Balthazar.
92* ''Franchise/StarTrek'':
93** ''Film/StarTrekFirstContact'' mixes up this trope by having the twosome be ''ships''. A [[AssimilationPlot Borg Sphere]] and the ''[[CoolShip Enterprise-E]]'' travel from the 24th century to a post-WorldWarIII mid-21st century Earth. The former to prevent mankind's first contact with the Vulcan race (which will result in the Federation being formed that would stop the Borg repeatedly from conquering the Alpha Quadrant) and the latter to ensure that first contact proceeds as it's meant to.
94** A variant in ''Film/StarTrek2009''; Nero and Spock are both accidentally sent back in time due to an UnrealisticBlackHole. Nero takes advantage of this by using futuristic mining technology to destroy Federation planets while Spock recruits past Kirk to stop him. In this case, the whole event creates a separate branched timeline which does not affect the original, so they're not trying to protect the future, but the plot still follows much the same formula.
95* ''Franchise/{{Terminator}}'', [[TropeNamers obviously]]. Basically, the entire franchise is a conflict between [[BigBad Skynet]] and the adult [[BigGood John Connor]] repeatedly sending their agents back in time to subvert each other.
96** In ''Film/TheTerminator'', a robot is sent back to kill Sarah Connor before she even gives birth to John Connor, and a BadassNormal human is sent back to protect her.
97** In ''Film/Terminator2JudgmentDay'', a [[VoluntaryShapeshifting shapeshifting]] robot is sent back to kill John Connor as a child. A reprogrammed robot like the evil one in the first movie is sent back to protect him.
98** In ''Film/Terminator3RiseOfTheMachines'', because John Connor cannot be located, the T-X is instead sent after who will become John Connor's top lieutenants [[spoiler:and wife]]. Finding John Connor was just a bonus.
99** In ''Film/TerminatorGenisys'', things get thrown out of whack. First two terminators are sent after Sarah Connor as a child, one to protect and the other to kill her. Then, the T-800 is sent as planned by Skynet to kill Sarah Connor ala the first movie, with Kyle Reese sent back to stop it, and the T-1000 sent back to stop ''him'', who is in turn foiled by Sarah Connor and the first T-800 sent back to protect her. After which the three go ''forward'' in time to Skynet's creation to destroy ''it'' before it can cause judgement day in the first place, with the T-3000 in turn sent to protect Skynet. Confused yet?
100** If ''that'' wasn't confusing enough, ''Film/TerminatorDarkFate'' disregards all movies after the second as AlternateTimeline and takes its place as the [[UnReboot new third movie]], where a new liquid metal Terminator is sent to terminate the new leader of the Resistance, with a cyborg member of the Resistance sent back to protect her, aided in the present by Sarah Connor and the [[TheAtoner reformed T-800]] [[spoiler:who successfully killed John Connor]].
101* ''Film/TimeAfterTime'' has Creator/HGWells traveling into the future in pursuit of Jack the Ripper.
102* ''Film/{{Timecop}}'' features Creator/JeanClaudeVanDamme as, well, a Timecop who travels to the past to apprehend criminals who threaten to change the timeline.
103* ''Film/{{Trancers}}'': When an evil psychic goes back in time to present day Los Angeles, Jack Deth is sent back to stop him.
104* A variant in ''Film/Warlock1989''; the Warlock escapes to the future and the witch hunter Redferne follows to hunt him down.
105[[/folder]]
106
107[[folder:Literature]]
108%%* An unintentional example in a Russian novel, where two Russian cosmonauts somehow end up in the past during the decline of the Roman Empire. One of them gets captured by barbarians, while the other one ends up becoming a Roman legionnaire. Eventually, the latter becomes the primus pilus (senior centurion) of a Roman Legion and is determined not to let the Empire fall, while the other manages to become the chieftain of the Germanic barbarians who captured him. You can see where this is heading.%%This example has been commented out for not identifying the work from which it originates. Do not uncomment it without adding the work.
109* Used with a ridiculously complex plot in ''Literature/{{Animorphs}}[[ColonCancer : Megamorphs 3: Elfangor's Secret]]''. In brief, a human (John Berryman) who is mind-controlled by an {{Alien Inva|sion}}der (Visser 4) gets a time machine, and the heroes (4 human teenagers, a human-brained hawk, and an alien, each of whom can change into animals) follow him through time. As part of some elaborate treaty involving [[SufficientlyAdvancedAlien god-like beings]], the heroes become [[IWillFightSomeMoreForever immortal]] after [[spoiler:Jake is shot with a musket while Washington is crossing the Delaware. Washington dies as well, thanks to Berryman/Visser 4 tipping off the British]]. Because of Visser 4's influence on time, the course of history is changed, to the point that in World War II, [[spoiler:Nazis are the good guys and the British still hold slaves. The heroes were not aware of this while at Normandy, and neither was Visser 4. The protagonists' fighting for the British at Normandy brings a British victory, dooming the world to slavery]]. After much debate about the ethics of changing the course of time once more, the heroes decide to [[spoiler:go back in time and prevent John Berryman's birth, stopping the entire sorry situation in the first place and saving Jake]].
110* In ''Literature/TheApocalypseTroll'', an alien-created cyborg-modified human is sent back in time to destroy humanity before they develop FTL space travel. A human space-naval officer also goes back in time to stop it. Unusually for the trope, it started as two entire StandardSciFiFleet battle groups fighting both before and after the actual time travel, but each side only had a single survivor left after all the nukes finished flying, so this trope still applies.
111* In the ''Literature/BelisariusSeries'', two artificial intelligences from opposite sides of a far-future war get sent back to the early Middle Ages, one to try and alter the timeline so the evil side wins the future war, the other to try and stop the first one, via recruiting local BadassNormal allies. A semi-subversion, since both sides are attempting to change the timeline. Indeed, both ''rely'' on massively altering the cultural and technological evolution of the world; they just each want history to evolve in a different direction. This is because, after the changes already made by the "bad" AI, the timeline has already been irrevocably changed, so the "good" AI needs to ensure that the right culture comes out on top.
112* In ''Literature/DiesIrae'', Heljanita wants to change the past, and Darkscar wants to unchange it.
113* ''Literature/TheDraka'': In ''Drakon'', a [[DarkActionGirl genetically engineered superhuman woman]] accidentally travels through a wormhole from an alternate future back to a world resembling our own present time, and promptly begins trying to find a way to re-open the wormhole and bring through a conquering army of more genetic supermen. A lone {{Cyborg}} human is also sent back through a similar wormhole to stop her.
114* ''For King and Country'', by Creator/RobertAsprin and Linda Evans, features [[spoiler:what seems to be]] an example of an IRA agent traveling back to Arthurian times to change history in Ireland's favor or simply punish England, and a British soldier trying to stop it. They go all the way back to around 500 AD or so and share the bodies of people close to King Arthur. It seems like a StableTimeLoop and/or TrickedOutTime, but the ending is a little ambiguous. MeanwhileInTheFuture, their bodies remain in a comatose state while they are in the past.
115* In ''The Last Day of Creation'' by Wolfgang Jeschke, the US government invents time travel and sends an expedition millions of years into the past to steal oil from Saudi Arabia, pipe it across the Mediterranean (then a dry lakebed) and ship it to what will become the United States. Only on arrival they find themselves attacked by a better armed and organised force sent by the Arab states (yes, this novel was the inspiration for ''VideoGame/OriginalWar''). As there's been a temporal arms race triggered by all this, the future changes so much that both sides are stranded in the past as the governments that sent them no longer exist and therefore won't develop the technology to bring them back.
116* ''Literature/NightwatchDiscworld'' features Sam Vimes and a criminal both [[LightningCanDoAnything accidentally going back in time]], and Sam Vimes has to stop him from changing history for the worse -- while wondering whether he can morally allow history to run its course when it means innocent people dying that could be saved if he used his knowledge from the future to make a few changes of his own. [[spoiler:He finally decides to make the changes, though these turn out to be entirely necessary to counteract those of his nemesis and arrive at broadly the same present they left.]]
117* In ''Rebel in Time'' by Creator/HarryHarrison, a racist colonel steals the design of the Sten submachine gun and travels back in time to change the course of UsefulNotes/TheAmericanCivilWar. He is pursued by another officer, whose task isn't made easier by the fact that he's black.
118* ''Franchise/StarTrekExpandedUniverse'':
119** The novel ''Imzadi'' by Creator/PeterDavid has an aging Riker trying to change the past [[spoiler:back to what it was]], with Data trying to keep it as it was [[spoiler:not knowing that it was changed in the first place]]. When the characters realize this at the end and ask the Guardian of Forever why it didn't say so sooner (potentially saving them all a lot of trouble and/or {{Angst}}), it replies (literally) "YouDidntAsk."
120** In the ''Strange New Worlds'' story "God, Fate or Fractals", it's Wesley Crusher versus a pair of Temporal Investigations agents.
121* In ''Literature/StrikeTheBlood'', [[KidFromTheFuture Reina]] arrives in the present to stop a dragon from the future.
122* ''Literature/TimeWars'': In ''The Ivanhoe Gambit'', Lucas and his team are sent to the 12th Century to prevent a rogue referee from damaging the timeline. The events of this novel wind up uncovering the larger conspiracy that drives the plot of the rest of the series.
123[[/folder]]
124
125[[folder:Live-Action TV]]
126* ''Series/TheFortyFourHundred'' were abducted by people from the future and returned to the present to SetRightWhatOnceWentWrong, while members of the anti-promicin conspiracy known as The Marked were sent back by a different future faction to thwart them.
127* An episode of ''Series/TheAdventuresOfSuperboy'' might as well be called "Terminator: The Episode". An android arrives from a distant future to kill Clark, as Clark's descendants will have ensured that the future is a utopia. To stop the android, a woman is sent to save Clark, who turns out to be quite strong herself, causing Clark to wonder if she's one of his descendants. At the end, after the android is destroyed (actually, it self-destructs after Clark fakes his death), the girl turns out to be an android herself, who explains that now that her own mission is complete, she must self-destruct as well to prevent any changes to the timeline. She only asks that Clark bury a certain component of her in a specific place [[FlingALightIntoTheFuture for her future creator to find]] (i.e. an indicator that she succeeded).
128* ''Series/AgentsOfSHIELD'': Season 7's StoryArc is all about the Chronicoms going back in time and trying to alter history to eliminate S.H.I.E.L.D. and create a world that is less defended against their [[AlienInvasion impending invasion]], and the S.H.I.E.L.D. team chasing after them to try and stop it. Ultimately, the changes that the Chronicoms make build up too much for the heroes to stop, but fortunately, it turns out that [[Franchise/MarvelCinematicUniverse the MCU]]'s time travel rules (as established in ''Film/AvengersEndgame'') apply here too, creating an AlternateTimeline separate from the main one rather than overwriting it. [[spoiler:This turns out to all be part of [[TheChessmaster Fitz's master plan]] to create a scenario that the team can use to defeat the Chronicoms in ''both'' timelines.]]
129* Series two of ''Series/AshesToAshes2008'' becomes this, with [[BigBad Martin Summers]] trying to SetRightWhatOnceWentWrong from his perspective, but would actually MakeWrongWhatOnceWentRight for everyone else. Alex decides that acting as the TimePolice will enable her to [[TrappedInThePast get home]].
130* Being the pop culture-fueled FantasyKitchenSink that it is, ''Series/BigWolfOnCampus'' naturally features these in one episode. An android resembling Merton, nicknamed "The Mertonator", is sent back to present-time Pleasantville to kill Tommy, who seemingly became famous enough of a hero in the future for this to occur. The Mertonator is soon followed by an android resembling Tommy, who was sent to protect him. [[BlackComedy Hilariously]], when it looks like the two androids are about to have an epic beatdown, the Mertonator [[CurbStompBattle just reduces the Tommy android into]] ''[[CurbStompBattle slag]]'', forcing the heroes to defeat it themselves.
131* ''Series/Castle2009'' of all things features an example. [[MaybeMagicMaybeMundane While it could have a mundane explanation]], said explanation makes less sense than this. While TheStinger of the episode leaves it as an open question, the behavior of the killer makes no sense if he isn't a time traveler, as it would require that he work backwards in an extremely convoluted fashion.
132* ''Series/Charmed1998'': In "[[Recap/CharmedS3E4AllHalliwellsEve All Halliwell's Eve]]", the sisters are sent back in time to save one of their ancestors; at the same time, team evil is sending back their main agent to prevent their birth.
133* ''Series/ChouseiKantaiSazerX'': [[LaResistance Sazer-X]] travels back in time to stop [[SpacePirates Descal]] from conquering Earth and establishing the [[TheEmpire Neo Descal]], while Neo Descal travels back in time to defeat Sazer-X and [[ConquerorFromTheFuture conquer the past Earth]] for their ancestors to ensure the timeline stays the same.
134* ''Series/{{Continuum}}'':
135** In the pilot, 8 members of [=Liber8=] (a terrorist movement fighting the corporate government) are sent back in time from the year 2077 to present day Vancouver, along with corporate police officer Keira Cameron. The [=Liber8=] members, with all their skills, knowledge and [[SuperSoldier futuristic upgrades]], decide to topple the corrupt corporations who will eventually take control of the government, so Cameron allies with the Vancouver police to take down what temporal locals see as an emerging terrorist cell.
136** ''Continuum'' gets downright recursive with this; the initial conflict between Kiera and [=Liber8=] generates a whole new timeline, [[CrapsackWorld even worse]] [[CrapsaccharineWorld than the original 2077]], and another character arrives from this timeline to prevent both Kiera and [=Liber8=] from screwing things up further. There's also yet ''another'' time traveler, from some indeterminate point in the future, who goes to the past and founds an organization of TimePolice who are trying to stop all of the above.
137* ''Series/DoctorWho'': The whole concept of the oft-mentioned Time War in the new series, with the Time Lords themselves waging war against a galaxy-spanning Imperial Dalek fleet. The war was so big, most other species were too technologically underdeveloped to even notice.
138* In season 5 of ''Series/TheFlash2014'', Barry and Iris's daughter Nora comes back from the future in order to [[spoiler:save Barry, so she doesn't grow up without a father]]. Later on, though, it's revealed that [[spoiler:Cicada's niece Grace has come back from another future in order to prevent her uncle from being de-powered]].
139* In ''Series/Galactica1980'', Xavier went back to World War II to [[GivingRadioToTheRomans give rocket technology to the Nazis]], hoping it would make Earth advanced enough to repel Cylons in 1980 but Troy and Dillon go back to stop him. Them chasing him to different time periods was originally going to be the entire show.
140* In ''Series/GuestFromTheFuture'', Alisa follows space pirates who in turn chase Kolya Gerasimov escaping via the time machine in order to save Mielofon from them.
141* ''Series/HerculesTheLegendaryJourneys'':
142** Subverted with "[[Recap/HerculesTheLegendaryJourneysS2E13TheEnforcer The Enforcer]]", in which a terminator-like woman is sent by Hera to kill Hercules but with no time-traveling involved. Its SequelEpisode even takes after ''Film/Terminator2JudgmentDay'', with a fire-elemental enforcer appearing as a stand-in for T-1000 while the original enforcer is sent by Hades to protect Hercules (again with no time-traveling involved).
143** "[[Recap/HerculesTheLegendaryJourneysS4E13ArmageddonNowPart1 Armageddon Now: Part 1]]/[[Recap/HerculesTheLegendaryJourneysS4E14ArmageddonNowPart2 Part 2]]" has a complicated case. Callisto is sent back in time by Hope to kill Hercules' mother to prevent his being born. Iolaus is sent back in time by Ares to prevent this. While killing Hercules's mother is clearly an example of MakeWrongWhatOnceWentRight, Callisto agrees to commit the heinous act in exchange for the chance to [[spoiler:[[SetRightWhatOnceWentWrong prevent her parents from being killed by Xena's army]]. That doesn't go well for her, when it turns out to be a StableTimeLoop with her killing her own family by accident]].
144* ''Franchise/KamenRider'':
145** ''Series/KamenRiderDenO'' features Imagin going into the past to wreak havoc with Kamen Rider Den-O time travelling to stop them.
146** ''Series/KamenRiderZiO'' plays around with the formula a bit. At the outset, the twosome has the same goal of averting a BadFuture, but vastly different methods: Tsukuyomi finds the EvilOverlord Ohma Zi-O when he's still OrdinaryHighSchoolStudent Sougo Tokiwa, warns him about the future, and tries to keep him off the path of evil. Her friend Geiz Myoukoin is willing to just straight-up murder Sougo if it means changing the future, but eventually Tsukuyomi convinces him to help guide Sougo into becoming a hero rather than a villain. There's also Woz, who came back to help Sougo become the evil overlord, and the Time Jackers who are trying to set up their own candidates for overlord. Later in the series comes a second Woz, who's from a ''different'' future than the others. Like the first Woz, he's trying to keep history the way he remembers it, only his history involves Geiz defeating Ohma Zi-O before he could come to power.
147* ''Series/MiraiSentaiTimeranger'' and its adaptation ''Series/PowerRangersTimeForce'' are about mutant criminals coming back from the year 3000, and the TimePolice right behind to stop them.
148* Creator/HarlanEllison's ''Series/TheOuterLimits1963'' episodes "[[Recap/TheOuterLimits1963S2E1Soldier Soldier]]" and "[[Recap/TheOuterLimits1963S2E5DemonWithAGlassHand Demon with a Glass Hand]]" may have created this trope. In fact, the producers of ''Film/TheTerminator'' had to pay a settlement to him following a lawsuit.
149* ''Series/QuantumLeap'', in its final season, features an [[EvilCounterpart Evil Leaper]] who tries to undo the positive changes in the past wrought by Sam Beckett.
150* ''Series/QuantumLeap2022'' plays with this a bit. Martinez's mission on leaps isn't to sabotage Ben's leaps a la the original series' Evil Leapers; rather, he ''also'' has to SetRightWhatOnceWentWrong in order to leap. But at the same time, Martinez's end goal is to leap ahead and kill Ben's fiancee Addison. Ben's original intention for stepping into the accelerator -- at least, according to Janis Calavicci -- is actually to sabotage one of Martinez's leaps in order to prevent Martinez from leaping out, and thereby save Addison's life.
151* ''Franchise/StarTrek'':
152** This is the plot of the ''Series/StarTrekDeepSpaceNine'' episode "[[Recap/StarTrekDeepSpaceNineS05E06TrialsAndTribbleations Trials and Tribble-ations]]". The villain of the ''[[Series/StarTrekTheOriginalSeries TOS]]'' episode "[[Recap/StarTrekS2E15TheTroubleWithTribbles The Trouble with Tribbles]]" attempts to assassinate Captain Kirk in order to alter the outcome of that episode, and our heroes need to stop him.
153** A major plot in the first seasons of ''Series/StarTrekEnterprise'' is the Temporal Cold War, in which various future factions use agents (some of them sent from other eras, others natives of the 22nd) to try to manipulate "historical" events in their favor.
154* The ''Series/{{Supernatural}}'' episode "[[Recap/SupernaturalS05E13TheSongRemainsTheSame The Song Remains the Same]]" ultimately turns out to be a Terminator Threesome. First, Anna goes back in time with the intention of averting the apocalypse by killing John and Mary Winchester before Dean and Sam can be born. Sam and Dean, with Castiel's help, follow her in order to save their parents from Anna ''and'' [[SetRightWhatOnceWentWrong from their fates in the original timeline]]. Finally, [[spoiler:ArchangelMichael]] goes back to ensure that history takes its established course.
155* In ''Series/TerminatorTheSarahConnorChronicles'', another evil robot is sent back to kill John Connor as a teenager, and a reprogrammed robot who [[RobotGirl looks like a cute waif of a girl]] is sent back to protect him. Over the course of the series, other robots and human resistance fighters are also sent back. They even have conflicts between the many terminators sent back, if their tasks conflict with one another. For example, a terminator is sent to kill and replace Special Agent James Ellison. The attempt is interrupted when Cromartie, a terminator sent to find and kill John Connor, saves Ellison and destroys the other robot. When asked why by Ellison, Cromartie simply says that Ellison will lead it to the Connors. Not under duress but because Ellison is looking for them himself.
156* ''Series/{{Timeless}}'' is built around this. A terrorist and his henchmen steal an experimental time ship and set out to [[MakeWrongWhatOnceWentRight completely alter American history]] [[spoiler:[[WellIntentionedExtremist in order to root out]] the AncientConspiracy controlling the country]]. To stop him, the government and the private company that built the time ship gather a group of experts to go back on a prototype of the ship and prevent him from making any changes. Another twist is that [[spoiler:Flynn, the main "terrorist", is being guided by a diary that one of the protagonists is supposed to write a few years later]]. In Season 2, [[spoiler:Flynn has been imprisoned, and his time machine is now under the control of [[AncientConspiracy Rittenhouse]], the very organization Flynn wanted to destroy]].
157* ''Series/TimeTrax'' is a variation. The hero Captain Darien Lambert was sent back into the past to retrieve several escaped criminals who escaped to the past with the help of a MadScientist named Mordecai Sahmbi. This trope applies since Sahmbi himself also escaped into the past, and several times his schemes in the past threaten to change the timeline, and the hero must stop him. Unfortunately, the show can't decide on whether the 20th century shown is actually Lambert's past or merely a time-shifted alternate universe. The main character's main problem with them is that they're escaped criminals, not that they're a danger to his timeline. He does, however, have a personal score to settle with Sahmbi for killing his {{Love Interest|s}} in the pilot.
158* This is the central idea of ''Series/TruCalling'', though by the time it's revealed that this is the case and the conflict between Tru (change the past to save people) and her counterpart (keep this past the same and let people die) is properly introduced, the show was on the verge of being cancelled, so the idea is never fully developed.
159* ''Series/WonderWoman1975'': In "Time Bomb", Cassandra Loren, an expert on 20th Century history from 2155, travels back in time to UsefulNotes/LosAngeles in 1978 in order to [[TimeTravelForFunAndProfit use her knowledge of the future to make a fortune]]. Adam Clement follows her back to stop her.
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162[[folder:Pinballs]]
163* This is the premise of ''Pinball/Terminator3RiseOfTheMachines'', with the player in the role of the T-850. Symbolized in-game by the two Terminator heads on the playfield.
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165
166[[folder:Tabletop Games]]
167* One of the adventure seeds in ''TabletopGame/FateOfCthulhu'' has the characters run into [[EvilTwin versions of themselves]] sent back from an altered future to stop them from doing whatever they do.
168[[/folder]]
169
170[[folder:Theatre]]
171* ''Theatre/HarryPotterAndTheCursedChild'' has the Augurey go back in time to prevent Voldemort's first defeat and Harry and co. having to stop her.
172* ''Theatre/AVeryPotterMusical'': In ''A Very Potter Sequel'', Lucius Malfoy travels back in time to kill Harry and prevent Voldemort's defeat. [[spoiler:Draco]] hitches a ride in order to stop him.
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175[[folder:Theme Parks]]
176* In the now-defunct ''Ride/BackToTheFutureTheRide'' formerly at Ride/UniversalStudios, Doc Brown sent YOU back (and forward) in time to prevent Biff from messing up the timeline.
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178
179[[folder:Toys]]
180 The mini-comics for the aborted ''The Powers of Grayskull'' ''Franchise/MastersOfTheUniverse'' toyline would have had He-Man journey to Eternia's past of "Preternia", with Skeletor following him and joining the local villain, King Hiss. Meaning He-Man had to stay and stop him.
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183[[folder:Video Games]]
184* In ''VideoGame/{{Achron}}'', this is what happens in a standard two-player game.
185* ''Franchise/BlazBlue'': [[spoiler:The Black Beast and Hakumen are both pulled into the past by the same incident, setting up the GroundhogDayLoop that plays out repeatedly in the games.]]
186* Inverted like ''crazy'' by ''VideoGame/BrutalLegend''. [[spoiler:The evil "Emperor" (actually Empress, but demons don't differentiate apparently) Succoria is sent forwards in time, along with humanity's greatest warrior Riggnarok, who has sworn to slay her and is effectively her time-travel stowaway. When she reaches the future, she suffers a VillainousBSOD when she realises that humanity wins. Instead of slaying her, Riggnarok begins to feel the inklings of pity, and, well, the road gets lonely...]]
187* Played with both ways in ''VideoGame/DarkChronicle'': Emperor Griffon, who resides [[spoiler:10 thousand]] years into the past, is doing battle with LaResistance 100 years into the ''future.'' In order to eliminate them, he sends out his [[TheDragon agent]] into the ''present'', to destroy his enemies' settlements and erase them from existence. Enter [[RoyalsWhoActuallyDoSomething Monica]], from 100 years in the future, whose CosmicKeystone allows her to travel back to the present. With the help of the present-day protagonist, Max, she restores her allies' "Origin Points" and preserves future history (and, in one notable case, improves upon it.) Of course, Griffon's agent Gaspard will try to thwart their efforts....
188* In ''VideoGame/DCUniverseOnline'', hero and villain players do this as they try to mess with or prevent the opposing faction from messing with the origins of iconic characters.
189* In ''VideoGame/DragonBallXenoverse'', Towa and Mira are out to MakeWrongWhatOnceWentRight. Time Patrol Trunks, along with [[PlayerCharacter you]], are out to stop them and fix history. [[spoiler:Then, after you defeat Mira, [[DiscOneFinalBoss Towa retreats]] and [[SealedEvilInACan Demon God Demigra]] takes their place.]]
190* ''VideoGame/EarthBound1994'' displays this right at the beginning of the game. [[NoNonsenseNemesis Giygas chose to stop Ness while he was still weak by sending a Starman Jr. back in time to kill him directly]]. Luckily for Ness, a time-travelling alien named Buzz Buzz found him first to protect him. Unfortunately, Buzz Buzz dies shortly afterward. In true Terminator fashion, it is this time-travel attack that kicks off the plot and sets Ness on the path to defeat Giygas. Happens in the endgame too: Giygas is launching his main assault in the past, so the heroes have to go there to fight him.
191* ''VideoGame/FireEmblemAwakening'' features "Marth" [[spoiler:or Lucina, as she's actually named, as well as any other child characters]], sent back to prevent the BadFuture, and [[spoiler:the ''actual PlayerCharacter'', or at least an alternate thereof [[DemonicPossession possessed by]] the [[BigBad evil dragon Grima]]]] sent to enforce it.
192* In ''VideoGame/{{Jigsaw}}'', the player character (known as "White") is attempting to stop "Black" from changing the past, although neither side is really in the wrong.
193* The central premise of ''VideoGame/TheJourneymanProject''. In fact, the purpose of the [[TimePolice Temporal Security Annex]] (later Temporal Security Agency) to ensure that this trope is in effect in case someone else gets ahold of a TimeMachine. The sequels deal with other issues, with a temporal smuggling and [[spoiler:looking for an ancient {{Precursor|s}} relic in the past]].
194* ''Franchise/TheLegendOfZelda'':
195** ''[[VideoGame/TheLegendOfZeldaOracleGames Oracle of Ages]]'' has Veran, Nayru, Link, and Ralph, in a bizarre time-traveling quadrangle of BigBad, LivingMacGuffin, the hero, and TheScrappy.
196** Also happens in towards the very end of [[spoiler:''[[VideoGame/TheLegendOfZeldaSkywardSword Skyward Sword]]'']], when [[spoiler:Link and Groose follow Ghirahim back in time in order to both save Zelda and prevent the resurrection of the Demon King Demise]].
197* ''VideoGame/MagicalGirlLyricalNanohaAsPortable: The Gears of Destiny'' has WellIntentionedExtremist Kyrie Florian jumping back in time to retrieve an artifact that could help her scientist father save their dying planet. IdiotHero Amitie Florian then jumps back in time to stop her, since as said father mentioned, interfering with the time stream could lead to even worse consequences than the destruction of their evacuatable planet. [[spoiler:In addition, the both of them are also RidiculouslyHumanRobots.]]
198* In ''VideoGame/MillenniaAlteredDestinies'', the player is given a timeship by a hooded alien to guide four races in the Echelon Galaxy in order to stop the expansion of the evil Microids. One of the major obstacles is an [[EvilCounterpart alternate version of the player]] recruited by the Microids to sabotage the player's work. Like the player, he cannot be killed. While the game is normally played in a TakeYourTime manner, since you're not required to immediately rush to resolve such and such crisis, your EvilCounterpart is on SanDimasTime with you and can alter the past whenever he feels like it.
199* ''VideoGame/PokemonMysteryDungeonExplorers'' has [[spoiler:Dusknoir and Grovyle. One is there to stop the other from [[BadFuture plunging the world into a dark, frozen hellscape]]. However, the established course of the timeline ''is'' that hellscape, thus the game plays with the trope with a VillainWithGoodPublicity trying to stop the HeroWithBadPublicity from changing anything]].
200* An ongoing, [[TheChessmaster chessmaster-y]] form of this is half the plot of ''VideoGame/RadiantHistoria'', with the BigBad making minor changes to MakeWrongWhatOnceWentRight and Stocke making similar changes to counteract them.
201* ''VideoGame/RescueRaiders'' does this with whole armies: one fighting to [[StupidJetpackHitler change the outcome of World War II]], the other to stop them.
202* The final cutscene in ''VideoGame/StarTrekArmada'' has the timeship USS ''Premonition'' from the BadFuture follow a Borg sphere into the past to save the USS ''Enterprise''-D. Luckily, the sphere is damaged and is blown up by a single torpedo volley. The ''Premonition'' then jumps into its own time, with past Picard simply noting the strange battle in the log and moving on.
203* The BigBad of ''VideoGame/TimeShift'' is a disgruntled scientist who uses a time-traveling suit to travel to the past and use his [[OmnidisciplinaryScientist vast scientific knowledge]] to TakeOverTheWorld and establish a fascist dystopia. The player is a second scientist, also equipped with a time-traveling suit, who follows the first scientist through time in order to stop him.
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206[[folder:Visual Novels]]
207* ''VisualNovel/TimeHollow'' plays a variation of this. Upon learning that the past has changed, the protagonist tries to undo the antagonist's interferences in time through time portals. The biggest conflict is [[spoiler:trying to save the antagonist's mother, who sent herself a letter in time to commit a form of suicide]].
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210[[folder:Webcomics]]
211* ''Webcomic/BadMachinery'''s "Case of the Forked Road" has two different {{Power Trio}}s taking these roles. It's made slightly more complicated by the fact that Calvin Goater has been time-travelling before them for as-yet-unspecified reasons.
212* The "Surreptitious Machinations" arc of ''Webcomic/GeneralProtectionFault'' draws heavily from ''The Terminator'', taking place in a future where Empress Trudy has conquered the world, and where [[spoiler:Nick and Ki's son]] Todd goes back in time to prevent the future from coming about, while the Empress herself goes back to stop him. Interestingly enough, it's revealed at the end that [[spoiler:only by the Empress' informing her past self could the bad future come to be (which would only happen if the bad future already exists, creating a time paradox), which reverses their roles]]. A Terminator comes back to the present to deal with Todd, but fails early on and serves as a way to [[spoiler:frame Fooker for murder]].
213* ''Webcomic/{{SSDD}}'' has this with two factions: the Anarchists, who are trying to orchestrate the past to result in an economic collapse leading to their rise in power, and Dr. Cook's people, who are trying to avert that. Cook's group has one cybernetically-enhanced SuperSoldier (Tessa), while the Anarchists send a series of robots and clones.
214* Exaggerated in [[https://xkcd.com/2222/ this]] ''Webcomic/{{xkcd}}'' strip. Someone is visited by their future self, warning them to not watch ''Film/TerminatorDarkFate''. Then, their other future self appears, this time from a timeline where they regret not watching the movie, convincing the present self to go see it with them. And then the future selves are visited by ''their'' future selves, wanting to stop them both. The comic eventually devolves as more and more future selves arrive, [[HitlersTimeTravelExemptionAct including one who wants to kill Hitler but got the year wrong]].
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217[[folder:Western Animation]]
218* Replace individual with faction and this is the plot of the third season of ''WesternAnimation/BeastWars'', when it turns out that Megatron's plan to go back in time to destroy Optimus Prime didn't go as completely OffTheRails as initially thought.
219* The ''WesternAnimation/FamilyGuy'' episode "[[Recap/FamilyGuyS19E13PeTerminator PeTerminator]]" has a terminator (who takes the form of Peter) sent from the future to kill Stewie, due to the future war between the latter and Brian that stemmed from a comment on an Instagram post. Not to mention the terminator Lois, who appears to be a stand-in for T-1000. The title sequence for the episode even has all the characters as flaming skeletons as if Judgement Day occurred, as dramatic music plays and the camera pans across the devastation.
220* The second series of ''WesternAnimation/GadgetBoyAndHeather'', "Gadget Boy's Adventures in history": Heroic trio versus four villains.
221* ''WesternAnimation/JackieChanAdventures'' did this with a FutureBadass version of Jade and [[BigBad Shendu's]] KidFromTheFuture, Drago, in "J2". Future Jade's arrival was even accompanied by Terminator-style music.
222* ''Franchise/MastersOfTheUniverse'':
223** In the ''WesternAnimation/HeManAndTheMastersOfTheUniverse1983'' episode "The Time Corridor", He-Man, Man-At-Arms, Orko and Battle Cat have to travel back to Preternia to stop Skeletor destroying Castle Grayskull with the Wheel of Infinity.
224** ''WesternAnimation/TheNewAdventuresOfHeMan'' has He-Man being summoned to the future to save the planet Primus. Needless to say, Skeletor follows him and joins the bad guys.
225* ''WesternAnimation/MegasXLR'':
226** One episode revolves around Gorrath's second-in-command's plan to kill a current-day ancestor of Kiva, as Kiva and Jamie try to protect her.
227** The show's main plot has shades of this as well: Kiva and MEGAS are sent back in time (further back than expected) and the Glorft commander followed her.
228* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'': In the fifth season finale, "[[Recap/MyLittlePonyFriendshipIsMagicS5E25TheCutieRemarkPart1 The Cutie Re-Mark - Part 1]]/[[Recap/MyLittlePonyFriendshipIsMagicS5E26TheCutieRemarkPart2 Part 2]]", Starlight Glimmer travels back in time to prevent Rainbow Dash from performing a Sonic Rainboom as a child, which would alter the fates of the main characters and prevent them from stopping various dangers in the future. Twilight and Spike follow her into the past to make sure that the Rainboom goes off like it was supposed to.
229* ''WesternAnimation/RickAndMorty'': Spoofed left and right in "[[Recap/RickAndMortyS4E5RattlestarRicklactica Rattlestar Ricklactica]]".
230** A dozen snake terminators get sent back in time to eliminate the [[HumansByAnyOtherName ape]] child Morty in order to protect the timeline. Meanwhile, the [[LaResistance Snake Resistance]] sends its own terminator to protect Morty from [[MegaCorp Serpacorp]].
231** A similar scenario unfolds on the snake planet with hordes of opposing terminators battling over the alien snake and her brood.
232** Happens again with the [[HitlersTimeTravelExemptionAct battle over snake Hitler]].
233* ''WesternAnimation/{{Superfriends}}'': In "Return of the Phantoms", three Kryptonian criminals travel back in time to kill Superboy so his older self Superman will not exist and he would have never trapped them in the PhantomZone. Superman and Green Lantern travel back to stop them.
234* The ''WesternAnimation/SupermanTheAnimatedSeries'' episode "[[Recap/SupermanTheAnimatedSeriesS3E3NewKidsInTown New Kids in Town]]" has a crossover with the Legion of Super-Heroes in which Cosmic Boy, Saturn Girl, and Chameleon Boy protect a young Clark Kent from a time-travelling Brainiac. Clark winds up [[HurlItIntoTheSun teleporting Brainiac into the sun]].
235* ''WesternAnimation/TeenTitans2003'': In a variant, Warp from the far future is followed through a time-gate by Starfire from the present, and she winds up hunting for him {{Twenty Minutes into the|Future}} BadFuture.
236* ''WesternAnimation/XMenTheAnimatedSeries'':
237** A two-episode arc involves Bishop traveling from the BadFuture to the present day, attempting to prevent the outbreak of a mutant plague. He succeeds, but his actions backfire and result in the deaths of the X-Men and the complete extinction (rather than just decimation) of mutants. Specifically, the vaccine that was created to counter the plague was also needed by future mutants to survive and due to Bishop's actions, it was never created -- so Cable comes from an ''even further'' future to stop Bishop. Cause the mutant plague or stop the mutant plague? [[spoiler:Nah, Cable [[TakeAThirdOption takes a third option]]: Infect Wolverine with the plague, letting his HealingFactor develop the vaccine, ''then'' destroy the plague.]]
238** You've also got the more basic variety in most TimeTravel episodes. First it's Bishop and Nimrod, then it's the Cable and Bishop thing, then it's Bishop and Fitzroy, then it's Shard and the various agents of Apocalypse (though they're from the present, Apocalypse is the version from Cable's future). [[spoiler:In the end, the BadFuture is ''not'' prevented, but at least they always managed to stop those who'd make it any worse.]]
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