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->''"People assume that time is a strict progression of cause to effect, but actually -- from a non-linear, non-subjective viewpoint -- it's more like a big ball of wibbly-wobbly... timey-wimey... stuff."''
-->-- '''The Tenth Doctor''', ''Series/DoctorWho'', "[[Recap/DoctorWhoS29E10Blink Blink]]"

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Excepting [[TheSlowPath mundane travel from the past to the future at a rate of one second per second]][[note]]For all you physics buffs out there, yes, this does imply that TimeTravel is unitless[[/note]], no human has ever experienced TimeTravel first hand. Indeed, we don't know if it's even possible[[note]]Albert Einstein's mathematics show it is achievable by TimeDilation through accelerating to high speeds, but only towards the future and without a way back. We also know that gravity slows down time, meaning that if you are in space your one second per second would be negligibly faster than on earth. Possibly exempting astronauts who, having been whirling around the earth at high speeds, have travelled a few seconds or minutes into the future depending on how long they have been in space[[/note]]. So debating [[OurTimeTravelIsDifferent which time travel]] [[TemporalMutability theory is right]] is much like trying to find the best flavor of Kool-Aid. Fans [[BellisariosMaxim are aware and accepting of this]], just like no one minds when OurMonstersAreDifferent, or two different series have [[FunctionalMagic different rules for magic,]] so long as the series' [[MagicAIsMagicA own internal rules are consistent.]]

Of course, sometimes they aren't. The Timey-Wimey Ball is the result of a series or movie where the writers are a wee bit confused or forgetful about exactly ''which'' kind of time travel can happen, sometimes within the span of one episode! One day YouCantFightFate (or at least not without the ButterflyOfDoom coming along), but the next you can ScrewDestiny and SetRightWhatOnceWentWrong by [[HitlersTimeTravelExemptionAct killing Hitler]] and changing the past for the better. Especially headachy because there's no TemporalParadox, or if it's totally arbitrary.

The standard HandWave (if one is given) is that time is very complicated and the particulars of the situation affect how the rules apply in ways that a layperson wouldn't understand. Which is one of the ''many'' reasons why some fiction fans ''really, really '''HATE''''' time travel.

Despite the similar images the name might conjure, this is unrelated to SwirlyEnergyThingy (although [[BuffySpeak a Swirly Energy Thingy might very well have Timey-Wimey effects]]). Likewise, a ContinuitySnarl is not necessarily related, though the presence of TimeTravel-induced {{retcon}}s can certainly make a character's past ''seem'' like a tangled up ball of yarn.

Compare CloseEnoughTimeline. Occasionally, anything involving this may decide to pull out the TemporalParadox card, and/or TheMultiverse. A TimeCrash is what happens when this ''isn't'' in play. See also NarniaTime. Aside from shape, unrelated to [[BallIndex ball-shaped behavior tropes]]. You had better hope it is unrelated to HappyFunBall.

'''Warning: High chance of spoilers.'''


* TimeyWimeyBall/DoctorWho


[[folder:Anime & Manga]]
* ''Manga/FairyTail'':
** First in the episode where Team Natsu gets briefly sent back to the past, creating a StableTimeLoop that affects their present selves [[labelnote:Note]](the scar on Natsu's neck, Lucy's desire to join the guild, etc.)[[/labelnote]], and later during the whole mess with the Eclipse Gate. [[spoiler:The dragon army came from the past, [[SetRightWhatOnceWentWrong Future Lucy came from a future where said dragons destroyed the land and wants to stop that from happening]], and Future Rogue came from a DIFFERENT future where ''that'' happened, but Acnologia took over the world and did what the dragons would do, so [[MakeWrongWhatOnceWentRight he wants to stop Lucy from stopping it so he can use the dragon army to kill Acnologia and rule the world himself]]. Destroying the portal in the present timeline ended the time travel magic, sending the dragons back to the past and erasing the futures from which Future Rogue and future Lucy had come.]]
** [[spoiler:Then there is Princess Hisui's plan to use the Eclipse Gate to kill Zeref and avert all the suffering he causes in the future. Later chapters reveal that it would have caused a TemporalParadox, as Zeref was the one to conceive the idea of the Eclipse Gate]].
* ''LightNovel/HaruhiSuzumiya''. The first thing we hear about time travel is that it's like a picture book; it looks continuous, but it's not, and scribbling on one page won't change the ending, so it's impossible to change the future. That gets thrown out the window pretty quick, with [[StableTimeLoop time loops]] up the wazoo. Several space-time locations get multiple time loops overlapping over them at the same time. However, starting in Novel 9, [[spoiler: the timeline splits-- not diverges, ''splits''-- and later fuses back together]], and in novel 10 it is revealed that [[spoiler:the evil time traveler Fujiwara is from a different future than Mikuru. In his, she's dead--and he wants to fix that, because she's his big sister. Unfortunately, in the timeline she's from (where she survived), her little brother never existed in the first place]]. So it's possible to change the future, right? Maybe. Because when all this craziness is going on, Kyon brings up the picture book analogy again, and it's confirmed that that ''is'' how time travel works (though at the same time it's implied to be an incomplete explanation). The mechanics of time travel in TheVerse are pretty much incoherent now.
* ''Manga/MahouNoIroha'': Time travel is apparently very possible with the help of magic, and the MagicalGirl main character somehow changes some things but not others that leaves readers scratching their head.
* ''Manga/MahouSenseiNegima'': Time travel watches pop up during the Mahora Festival arcs, creating {{Stable Time Loop}}s, multiple copies of Negi running into each other, a SetRightWhatOnceWentWrong or two, and some RuleOfCool duels that exploit the effects of short-range TimeTravel. However, it is later stated that long-range TimeTravel creates {{Parallel Universe}}s.
* ''Manga/NatsuNoArashi'' enjoys playing foosball with its Timey-Wimey Ball as characters jump back and forth across the hours, leading to a series of {{Stable Time Loop}}s.
* ''Manga/TsubasaReservoirChronicle'': The fucking up of the entire time-space continuum. Trying to trace the law of causality after a case of NiceJobBreakingItHero would cause more brain damage than the combined screws of Quantum Mechanics, Relativity, and Superstring Theory put together! Just one of the results was a situation where thanks to incorporating every single type of TimeTravel, you can't say if it is AlwaysIdenticalTwins, AlternateSelf, IdenticalGrandson, GenerationXerox, CloningBlues, MyOwnGrampa, TangledFamilyTree, EveryoneIsRelated or a blow your brain combo of all of these put together simultaneously! Putting what is confusing about the time travel involved into words is, in itself, extremely confusing.

[[folder:Board Games]]
* There's a ''TabletopGame/BackToTheFuture'' card game based on the film, where again each player is someone from an alternate timeline trying to manipulate the universe into one where they exist. However, one big difference is that after doing so, the time travelers have to ''stop Emmett Brown from inventing time travel'' so that nobody else can mess with it and their timeline becomes the only timeline. Paradox much?
* In ''TabletopGame/{{Chrononauts}}'', players are competing time travelers from alternate futures sent on missions into the past to recover various historical artifacts. Each player is playing tug-of-war with the timeline so that they can return home, which results in a very ''fluid'' history. If enough paradoxes pile up, they can even [[TimeCrash destroy the universe]].
* In ''Time Agent'', your objective is not to win. Your objective is to have already won... without Time Travel being invented. [[MindScrew This is probably the least confusing part of the game.]]
* In ''US Patent #1'' by Cheapass Games, each player has invented a time machine and hopes to profit from it, but the only one who will be able to profit is the one who holds a patent. Given that patents can be invalidated by proof of earlier work, the only patent that matters for a time machine is the chronologically first one. So the entire game consists of a race through time to be the first in line on the first day the Patent Office opens.

[[folder:Comic Books]]
* Marvel Comics' ''ComicBook/AdamWarlock'', specifically his evil future self The Magus embodies this trope. Adam Warlock met his futureself and immediately The Magus set about trying to ensure Adam would turn into him. This did not work when "Thanos" and the In-Betweener interfered and Adam was given a choice of timelines, wherein he chose the shortest. The Magus appeared again when Adam Warlock attained the Infinity Guantlet and divested himself of his good self (The Goddess) and his evil self (The Magus). The Magus initiated the Infinity War, but was defeated. Later, to seal the Fault in space caused, in part by the Annihilation Wave, The Phalanx Invasion, and the War of Kings, Adam Warlock [[spoiler: who, as he expanded magical energy slowly started turning into The Magus, used an "unused" timeline to repair the fault. That particular "unused" timeline was the one in which he became The Magus]].
* ''ComicBook/TheAvengers'':
** Say the word "Kang" to a fan and they'll often shudder. His time-travel schemes are so complex that his future self, Immortus, is another major Avengers enemy, and the two can often be seen fighting each other. To give a sense of scale: most Marvel Handbook profiles are one to three pages long except for major characters like Franchise/SpiderMan, ComicBook/IronMan or ComicBook/{{Wolverine}}. Kang's gets ''six pages'', and the bottom half of each page is devoted to Kang's timeline, which is chronological in years but requires jumping around from page to page to get Kang's chronological story.
** Made even ''[[UpToEleven more]]'' confusing with the addition of a third iteration of Kang in ''ComicBook/YoungAvengers'': Iron Lad who actually ''kills'' Kang in an attempt to prevent himself from becoming Kang and ultimately realizes the only way to save the future is to become Kang anyway. If you find yourself confused, know at least that you aren't alone:
--->'''ComicBook/JessicaJones:''' Is this a time-travel thing? Because I ''hate'' time-travel things.\\
'''Iron Man:''' If it's Kang, it's a time-travel thing.\\
'''Jessica:''' See, this is why I hate Kang...
** You can also thank Kang for raising one of the X-Men's greatest foes, Comicbook/{{Apocalypse}}.
* Franchise/TheDCU has all sorts of fun here, especially when ComicBook/BoosterGold is involved, but it's been proven time and again that trying to ScrewDestiny usually ends badly. Aside from that, the Timey-Wimey Ball hurts Booster's head as much as it hurts the audience's.
* ''Franchise/TheFlash'':
** Professor Zoom has (retroactively) had his hands on the Timey-Wimey Ball from day one. In a single issue you see him edit his brother, parents, scholarly rival, and lover out of ''his own history'', apparently to make sure he'll actually become the supervillain he is. ItMakesSenseInContext.
** And then the Professor started in on Barry's history, and that ended with Comicbook/{{Flashpoint}}. [[NiceJobBreakingItHero Nice job breaking it, psycho.]]
** The Flash himself historically averted this trope when at all possible. Barry and Wally repeatedly refused to even try holding the Timey-Wimey Ball. [[spoiler: Until Comicbook/{{Flashpoint}}. NiceJobBreakingItHero.]]
** The second Zoom came into being because he tried to grab the Timey-Wimey Ball and blew himself up. Unfortunately for him, his powers (unlike every other speedster) avert the trope.
** An issue of ''Impulse'' had a MadScientist invent a time machine, and attempt to change the past so that he would rule the world. Impulse and Max Mercury go back in time to stop him, but wind up stuck in the far distant past. Max lectures Bart on the ButterflyOfDoom, and how even eating a fish might cause irreparable harm to the future. But then they discover that the mad scientist is now trapped in the past as well. The three of them decide that the best way to get home is ''to cause as much damage and destruction as possible''. Their [[InsaneTrollLogic logic]] is that if they completely change the past, it will alter the future so much that the scientist will never exist, which means he will never invent his time machine, which means they won't have travelled to the past in the first place, which means they won't actually cause any damage at all and find themselves back home. Confused?
* ''ComicBook/GoldDigger'': With all the dimension-hopping, time-traveling technology in Gold Digger, naturally there's a lot of Timey-Wimey Ball action going on. However, of special note is issue #50 of the color series, which features an artifact that is an ''actual ball of string that can warp time and space''.
* ''ComicBook/{{Iznogoud}}'': In ''Iznogoud's Childhood'', Iznogoud experiments a type of time travel in which the present and the past happen at the same time for a while, which he tries to exploit by attempting to get rid of the Caliph's younger self. The whole thing eventually end up being a StableTimeLoop, in which Iznogoud's time travel is what causes his younger self (who UsedToBeASweetKid) to transform into the JerkAss we're familiar with. However, earlier in the comic, Iznogoud stabs younger Wa'at Alaaf to test the time travelling nature, and that case works on a RippleEffect basis, in which adult Wa'at Alaaf shows up with a scar he'd never had.
* ''ComicBook/{{Legion of Super-Heroes}}''. [[ContinuitySnarl There's three of them.]] ''Two'' of their enemies are the {{Anthropomorphic Personification}}s of the Timey-Wimey Ball.
* Limbo in the Marvel Universe (mainly shows up in association with ''ComicBook/XMen'') is an entire ''dimension'' of timey-wimeyness. When the X-Men entered and got separated, both Wolverine and Colossus encountered long-dead versions of each other, and managed to escape just fine in the end. ComicBook/{{Storm}} was stopped at one point by her older self, who had remained in Limbo for decades studying magic. And ComicBook/{{Nightcrawler}} killed his older self.
* ''ComicBook/SonicTheHedgehog'' has an interesting variation at one point. Knuckles, juiced up on Chaos Energy, was given the chance to bring back everyone on the Floating Island through his power. To do so, he keeps bouncing back in time and stopping a certain event. Not only does that have bad consequences for him, but what he doesn't know is that he keeps futzing up the actual Sonic events, creating timelines such as a pure [=SatAM=] world, one based off of the 1995 OVA and a timeline where Robotnik never initiated his coup. At the end, Knuckles decides to stop that and just bring everyone back from the prison the Dark Legion launched them into.
* In the 1980s Marvel ''ComicBook/TheTransformers'' comic, one can alter the past to suit the present. However, there is also the possibility that one travels to a different universe that is simply the same as your own. So thus, any attempt to travel back in time to, say, [[spoiler: build a giant cannon to destroy the dark god who created you when he turns his attention to Earth in order to free yourself from his control as Galvatron tried to]], can potentially end in failure as it is not your own universe. [[spoiler: As it turned out, it WAS Galvatron's own universe.]]
* Creator/JohnByrne's run on ''Franchise/WonderWoman'' has a classic example of the rules changing within a story. When Diana's mother becomes the new Wonder Woman, [[Franchise/TheFlash Jay Garrick]] recognises her as the mysterious woman who was involved in ''one'' of his adventures in UsefulNotes/TheGoldenAgeOfComicBooks, and who he never really met. When he tells Hippolyta this, she travels to the past in order to maintain the timeline by ensuring everything happens the way Jay remembers. Once she gets there, however, she decides to stick around and become the Golden Age Wonder Woman and a member of the Comicbook/JusticeSocietyOfAmerica. History is therefore completely altered after all, but no-one seems to mind.
* ''ComicBook/ZipiYZape'': All the story about the time-travel machine built in a barrel revolves around this trope. In the first chapter, the twins use it to transform a wall lizard into its evolutionary ancestor (which turns out to be a crocodile). In all the other chapters, the twins use it themselves; it no longer makes anything appear in the present time, but depending on the chapter, it either just takes them to the past, or somehow transforms them in their ancestor (and, somehow, with all the knowledge and remembrances that those ancestors have). In one chapter, when their mother makes an omelette with an egg found in the past, the twins remark that its strange look is due to the fact that the egg had over two hundred years, even though the time travel should have prevented the egg from aging. Finally, in the last chapter, the twins get trapped in the future when their machine gets broken; strangely, in a rare example of an {{inverted|Trope}} SanDimasTime, it's said that house prices were getting higher because of the twins' absence.

[[folder:Fan Works]]
* In DoctorWho fanfic ''{{FanFic/Gemini}},'' this trope is [[InvokedTrope invoked]] so as to [[DefiedTrope defy]] StableTimeLoop: It’s easier for the Daleks to change the past than it is for anybody else, so the military is trying to create super-soldiers that can change the timeline as easily as the Daleks can.
* In ''Fanfic/HarryPotterAndTheMethodsOfRationality'', the time turners are used much more frequently, which leads to this when two or more are involved. Dumbledore and Snape have to resort to charts.
-->'''[=McGonagall=]:''' Tell me your conclusions, but ''please'', don't tell me how you figured it out.
** This is actually an inversion, or something. The writer doesn't appear to be confused about what kind of time travel is possible; rather, he works very hard to make sure that it follows consistent rules. And the characters know about these rules. But trying to work out the logical implications of these rules results in confused characters and confused readers.
* ''Fanfic/KyonBigDamnHero'' has much more TimeTravel going on than [[LightNovel/HaruhiSuzumiya the original]] -- to the point that at any point of story there is at least one open [[StableTimeLoop loop]]. Amusingly, Kyon once [[ShoutOut quoted]] [[Series/DoctorWho the Doctor]] when trying to explain his understanding of TimeTravel.
* In the Franchise/MassEffect's ''[[Fanfic/CrucibleMassEffect Crucible]]'', the multiverses work mainly as "Overwriting the timeline" but later the [=CrucibleVerse=] itself become a hybrid version of both "Overwritting" ''and'' "Branching timelines". Basically, time can be seen as a river with different universes as balls floating in it. Each ball has in front of it what look like millions of almost identical versions of itself in different points spread across the width of the river while behind there's nothing. As the ball floats forward depending on how the river flows ­it'll take the place of one of the many copies and the others in line with it disappear. The potential what ­might have ­been's all disappear when the ball finally arrives. So as the the future hybrids come to present of the [=CrucibleVerse=] and change it, the BadFuture soon disappear to be replaced by a new future.
** But due to [[spoiler: Sam, Aunties and their "employers"]]'s intervention, a new future, different [=CrucibleVerse=] is created by pulling the bad future backwards and, as it can't survive on its own, [[ParallelUniverse branching off from the main timeline like a Siamese twin]]. In new time line, [[spoiler: the souls of those time travellers from the BadFuture]] are put into their younger bodies while alt.Jane [[spoiler: meet her main counterpart to know everything that happened in the now disappeared bad future to change the new twin universe for the better]]. This also cause Life and Death from the main timeline to work double-duty since they partly exist outside of time and space.
* In ''Fanfic/MyImmortal'', the main character Ebony travels back in time to teach a young Voldemort about love. But when she does, the plot really starts to get strange. A few examples are that characters in the past know what will happen in the present, that items will not work in time-periods where its not invented yet and that people can't die outside their native time-period.
* Similarly, ''[[http://archiveofourown.org/works/471497/chapters/815855 Time v3.0]]'', being a ''Doctor Who'' fanfic that does its best to encompass all the chaotic mess that was the Time War, uses this trope up, down, and sideways.
* ''Fanfic/ACrownOfStars'' tries to avert this. [[PhysicalGod Daniel and Rayana]] explain Shinji and Asuka that they ''technically'' can stop Second Impact and other tragedies... but then Shinji and Asuka would be completely different people, ergo their fixes would be meaningless. So both gods use time-travel to undo the ''consequences'' of those tragedies.
* In ''Fanfic/OnceMoreWithFeeling'' Shinji remembers everything what happened in the original timeline, even though a lot of events are significantly different due to his actions.
* In ''Fanfic/TheSecondTry'', Shinji and Asuka set to avert [[TheEndOfTheWorldAsWeKnowIt Third Impact,]] even though it'd mean that [[spoiler:their beloved daughter will never be born.]] In order to avoid this, [[spoiler:[[HumanoidAbomination Kaworu]] sends Aki back in time, but she arrives several months later than her parents]].
* ''Fanfic/ThousandShinji'': [[spoiler:The ''TabletopGame/{{Warhammer 40000}}'' gods]] changed the past so they never existed. Even so, Chaos Marine Khenmu and his brothers-in-arms keep existing, and [[spoiler:the fragments of the gods]] still existed and remembered the original timeline.
* "Fanfic/BrotherOnBrotherDaughterOnMother" attempts to make some sense out of the trope as it applies to ''Franchise/StarTrek'' (with the obligatory ShoutOut to the TropeNamer) with a variant of the many worlds theory wherein time is actually a ''rope'' made of strands of probabilistic outcomes that can tangle up. The purpose of the TimePolice is to prevent that rope from "fraying" due to major temporal incursions; smaller incidents are usually papered over by the inertia of time itself.

[[folder:Films -- Live-Action]]
* The time travel in ''Film/AboutTime'' appears to have at least two different modes, but the explanation is very scanty. Tim can go back to a previous occasion and change what he did, but then he can choose to either live from that point onwards, or snap forward to where he jumped from and see what the changes have been. The event described in SecretKeeper seems to suggest [[spoiler: he can also undo these changes.]]
* The whole messy issue of TimeTravel is {{lampshade|Hanging}}d in ''Film/AustinPowersTheSpyWhoShaggedMe'' when, after Austin starts to get bewildered by all the possible paradoxes his traveling into TheSixties involves([[MindScrew "Oh no, I've gone cross-eyed."]]), Basil jumps in with "I suggest you don't worry about that sort of thing and just enjoy yourself", and then turns pointedly [[BreakingTheFourthWall toward the camera]] and remarks "[[MST3KMantra and that goes for you all as well]]". Much self-contradictory timey-wimeyness ensues since, as Mike Myers puts it in his DVD comments, "our theory of TimeTravel is that TimeTravel works [[RuleOfFunny however we need it to work]] for each particular scene's joke."
** Although, ironically, the conversation that confuses Austin doesn't actually contain any inherent paradoxes; the Doctor Evil he was chasing was the contemporary version who had also gone back in time. Past Doctor Evil and Past Austin were both frozen cryogenically during the time period in question so there would be no crossover.
* ''Franchise/BackToTheFuture'' has different things happening to the hero as the past is changed. Read the timeline for the trilogy at [[http://backtothefuture.wikia.com/wiki/Back_to_the_Future_timeline this page]] if you have any questions about how it works. There isn't a single concern here that isn't covered there one way or another. To summarize, you ''can'' create alternate timelines, and any time it ''seems'' YouAlreadyChangedThePast (like Chuck Berry hearing the song he would later write) it's really just causing the same event in a different way (in the original timeline Chuck Berry ''did'' come up with the song entirely by himself).
* ''Film/Ben10RaceAgainstTime'' includes a bit of this. [[BigBad Eon]] seeks to use the Hands Of Armageddon to bring his DyingRace to Earth to repopulate, but traveling through time so much has weakened him to the point where he's unable to use the Hands. His plan is to use the Omnitrix to turn Ben into himself (a second Eon), so that ''he'' can activate the device and end the reign of humans on Earth. The movie is pretty vague about how it works, but at first glance, it seems as though Eon may actually ''be'' Ben, corrupted by himself in his own past. On top of that, when Eon succeeds in implanting himself in the Omnitrix, he declares that "two cannot exist at once", disappearing into a different point in the time stream.
* ''Film/BillAndTedsExcellentAdventure'' establishes that "[[SanDimasTime the clock is always running in San Dimas]]" -- that is, that however long Bill and Ted are in another time, that much time will have passed when they return to their "home time". This is held up for the first film and most of the second... [[spoiler:and then utterly discarded for the ending of ''Bogus Journey'', where they zap away for 18 months and return seconds after they left.]] Of course, the first film kludges it a bit as well -- when initially going back to their own time, they actually end up at the same point they left, and have to be told by Rufus that they need to dial 1 digit higher for the next day. Even more odd, Rufus never tells the two of them his name. They hear it from their future selves, who presumably heard it from ''their'' future selves who...
* ''Film/TheButterflyEffect'' has the events of roughly half of Evan's blackouts caused by his older self [[MentalTimeTravel going back to them]], while the other half were normal initially, but could be changed by his older self. One blackout even has examples of both. Also, it is established early on that Evan is the only who has any memory of the old timelines, but at one point another character notices a change in the timeline for no apparent reason.
* ''Film/{{Detention}}'' has one of these as a result of several things: a mother and daughter undergoing a FreakyFridayFlip that sees the daughter transplanted into her mother's body circa 1992, another kid from the year 1992 undergoing a nineteen-year time warp to the present day (2011), and a [[AsianAndNerdy nerdy Asian kid]] in the present day transforming the school's bear mascot into a time machine for a science project. Ultimately, it will result in the destruction of the world... actually, just the destruction of Grizzly Lake High School, because hey, it's not like the main characters know of a world beyond high school.
* ''Film/DejaVu'' starts out well enough, but implies that the detective has already gone back in time and failed. In the original timeline, the love interest dies, and the hero's blood is all over her apartment. So apparently, in the original timeline, he went back and failed. But then in the new timeline, he gets his wounds saving the love interest. He doesn't bleed all over the love interest's place until after he saves her. So how did there end up being blood in the original timeline, but the love interests dies? What's more, [[spoiler:the ending finishes without a StableTimeLoop of any kind, so either the changes made will reset or they've created one alternate timeline where everything is hunky dory and one where everyone's dead.]]
* ''Film/{{Frequency}}'' is one big Timey-Wimey Ball. You've got the son talking to the dad on the same ham radio, and even the whole "changes happen in sync with each other" deal. The first time John changes history and saves his father, he suddenly has memories of both timelines, which is promptly dropped for the rest of the film as from then on he only has memories of how things originally happened.
* ''Film/HotTubTimeMachine'' is really inconsistent with its time travel mechanics. Four friends travel back to one day in 1986 and hijack their younger bodies, so everyone sees them as their younger selves. Except one of the friends - Jacob - wasn't born yet and looks the same in the past as he did in the present, and can also interact with the past, but whenever something happens that might possibly stop his conception he flickers out temporarily. Initially the friends, fearing the ButterflyOfDoom, try to enact a StableTimeLoop by making sure the big events they remember from that night still happen, but then they change their minds and try to make sure the night goes better the second time around. Some of the big events they remember still happen no matter what they do, but no in the way they remember them. Other events they really do alter. Meanwhile they directly or indirectly cause a couple of historical changes. [[spoiler: In the end Lou decides to stay behind and use his knowledge of the future to greatly improve his and everyone's lives. When the other three friends get back they all have much better lives but do not remember them]].
* ''Film/TheLakeHouse'' was a horrible mixture of TimeTravel ideologies. In some ways the timeline is constant -- the guy she kissed at the party turns out to be the guy she's communicating with in the past. Yet in other ways the timeline is variable -- she tells him how she misses the trees, so he plants one at the place she's going to live at -- which she magically doesn't notice having grown until after she sent him that letter. And then there's the grandfather paradox involving the (lack of a) car accident at the end/beginning of the film, causing her to go/not go to the lake house and end up communicating/not communicating with the guy in the first place. And there's also the dog in the past timeline who responded to the name given to it in the future timeline.
* ''Film/{{Looper}}'':
** If you injure the present version of someone, the time-travelling-from-the-future version of the person will immediately show the scars.
** The trope is lampshaded on several occasions by the protagonists; criminals who don't really understand how the various time travel paradoxes work, only that trying to sort it out in their heads just gives you a headache.
** Subverted in the extended version of the diner scene which is included as a DVD extra: after telling Young!Joe that he's not going to try to explain the effects of changing the past, Old!Joe then proceeds to explain them, using a line of salt -- ''and it actually sorta makes sense.''
* ''Film/LostInSpace'' contains a plot where John and Don walk into the future by an energy field just to find future Will and Dr. Smith creating that energy field as a result to build a machine to travel into the past, because the entire family was wiped out as a result of John and Don disappearing by walking into the future. When present Will and Dr. Smith enter the bubble, nothing happens to their future selves. Hell, Future Dr. Smith killed his past self without a second thought.
* Time travel in ''Film/MenInBlack3'' varies between TemporalParadox (the plot starts off with history being altered so Kay died in the 60s), YouAlreadyChangedThePast ([[spoiler:Jay's father turned out to be have died in the process of [[SetRightWhatOnceWasWrong Setting Right What Once Was Wrong]]]]), and MentalTimeTravel ([[spoiler:Jay defeats the BigBad by rewinding time to avoid the attacks he can now see coming]]) depending on the needs of the plot.
* ''Film/{{Primer}}'' uses an [[http://en.wikipedia.org/wiki/File:Time_Travel_Method-2.svg interesting]] time travel method that begins to make sense.
* ''Film/ProjectAlmanac'' begins because David finds a video of his current day self at his seventh birthday party, which leads to him discovering and rebuilding the time machine stored in his father's basement, suggesting a StableTimeLoop. Immediately after doing this, however, the cast wantonly screws with their own timeline to make things more favorable for themselves, clearly demonstrating that time can also be changed at will. What's especially crazy is that [[spoiler:the situation the video depicts is David retgonning himself by destroying the time machine, which he succeeds in doing, meaning the very situation that led them to the time machine originates from a timeline in which said machine does not exist]].
* The film version of ''Film/ASoundOfThunder'' (if not [[Literature/ASoundOfThunder the book]]) uses hilariously inconsistent rules of time travel (and those rules don't make much sense ''before'' they start breaking them). It's a crucial plot point that the characters keep returning to the exact same point in time, but never run into previous versions of themselves (no explanation for that is given)... until the time they do (no explanation for that either). Plants smash through the walls of a building because the past was changed in such a way as to cause plants to grow larger and more aggressively (no explanation is given as to why someone decided to build the building in the spot where, in the new timeline, a giant tree has been growing for ages -- not to mention why the tree that's always been there smashes through the floor while people watch instead of just appearing as it if had always been there). At one point, the characters are unable to travel back to the point in time they want to reach because there's a time disturbance between the present and their destination in the past; the solution? Travel back to an ''even earlier'' point and then go forward (if you guessed that no explanation is given as to why the time disturbance is somehow not blocking that too, you've been paying attention). There were explanations - that the changes come in waves, changing things in fits and starts, not all as a whole. As for having to travel further back, that's easy to explain. Think of it as trying to get into a house, but the front door has something pressed against it stopping you from opening it. What do you do? Go in through the back door and then walk through the house to the front door to remove the blockage. Simples!
* ''Film/StarTrek'': WordOfGod has it that instead of erasing the later series, it just split off a new timeline, so that the later series still happened in the original timeline (dubbed "the Prime" timeline in ''Fanon'') but has not in the new timeline. This gets weird as there are many instances of characters from the Prime timeline traveling back to before the split, which means that if a character from the alternate timeline were to travel back to say, [[Series/StarTrekTheOriginalSeries The orbital Atomic Accident]], [[Series/StarTrekDeepSpaceNine The Bell Riots]], or [[Film/StarTrekFirstContact The first Warp Test]] they would find time travelers from the Prime timeline, which from their point of view doesn't exist. Quite a MindScrew... or AssPull, depending on the variance of your mileage. Prior to the film, ''Franchise/StarTrek'' was pretty consistent that time travel changes affect the existing timeline, they don't spawn new timelines (though the existence of parallel but different realities ''were'' established, they just weren't caused by time-travel).
* ''Film/StarTrekGenerations'', contains a nexus which can at once be described as a portal through time and simultaneously interpreted as a veritable heaven which may, in fact, act as merely a database containing the sentient thoughts of all who have encountered it. Kirk's visit to his past doesn't affect the timeline (although one may say this is due to him not actually doing anything to affect it). Picard, on the other hand, experiences an alternate present. While all this could seem viable as time travel, Guinan stops by to mention that Picard can experience the past or the future, the limits of his experiences within the nexus seemingly being restricted to his own imagination. This should leave a very FridgeLogic-taste in anyone's mouth when they realize that Picard and Kirk traveling back to stop Soren may not actually be time-travel but merely a pocket of Picard's own imagination within the nexus. Thus everything that happens past this point in time (i.e. ''First Contact'', ''Insurrection'' and ''Nemesis'') are not actually part of the prime timeline as Picard is actually gone and the Enterprise is destroyed with its crew dead. Note that the new timeline Star Trek could still be viable as there's no mention of Picard or Enterprise D and Generations has no effect on Spock's existence. Basically, if you accept the nexus as a means of time travel then the time line splits. If you argue it as merely Nexus-Picard's mind, then it doesn't.
* Each ''Franchise/{{Terminator}}'' movie uses a different theory of TimeTravel, though it's at least consistent ''within'' each movie.
** Though one persistent law of TimeTravel is that things can only TimeTravel is they are ''made of meat'' (so people, but not the organic fibers of clothing), ''wrapped in meat'' (i.e., Cyborg Terminators), ''can do a reasonably good imitation of meat'' (i.e., "Liquid Metal" Terminators) or sneak in when nobody's looking (Cromartie's head, which was still covered in meat). Which is to say, the mechanism here appears to be exactly analogous to airport security. The jury still is out on what would happen if you tried to bring a Ham and Fusion Grenade Sandwich with you.
** This actually gets answered in the comic book continuity. A group of skinned-up Terminators gets sent back, but bring along an extremely fat human they captured because he's ''literally'' a meat bag. [[WallOfWeapons Full of guns]]. Whom the others have to kill to open.
** The theory they use is that only living tissue can travel back in time. A deleted scene from the 2nd film indicates that the T1000 traveled back in a sack of living flesh and cut its way free before killing the cop. One inconsistency is a scene originally in the script for the first film indicates that Kyle Reese's partner, who travels back with him, gets fused into a fire escape and is instantly killed. Though as this is removed from the film it doesn't much affect the time portal energy cutting through things in the 2nd film.
** ''Film/TerminatorGenisys'' goes whole hog on the Timey-Wimey Ball, as Kyle goes to 1984, and finds that the past has already changed thanks to [=SkyNet=] sending Terminators to try to kill Sarah when she was even younger. And that was caused by a ButterflyOfDoom ''in the future'' - [[spoiler: namely, Sknet attacking John while Kyle was going back through time]]. ''Entertainment Weekly'' [[http://www.ew.com/article/2015/06/30/terminator-genisys-franchise-timeline-explained tried to explain how things went]] (the writer even lampshades how complicated things get: "If I follow this correctly—and I admit that my nose is bleeding while I type this...").
* In TheFilmOfTheBook ''Film/TheTimeMachine2002'', the Time Traveler discovers that he cannot change any part of the past that would interfere with him creating the Time Machine, since it would create a TemporalParadox. He can interfere with other matters, [[spoiler:such as when he goes even further into the future only to see the Morlocks victorious over the Eloi, and afterward returns to the year 802701 to successfully defeat the Morlocks]].
* James P Hogan had a solution in ''Thrice Upon a Time''. The prospective time traveler induces a grandfather paradox. The universe doesn't abhor it or disallow it or anything, but simply plays out the umpteen zillion iterations of the events in question. A leads to B leads to Not-A leads to Not-B leads to A leads to B... It should go on forever, but on each run-through, quantum randomness causes things to be very, very slightly different (an atom decays or not, a pair of colliding air particle zig instead of zag) totally regardless of anything the time traveler does. Normally they won't make any difference whatsoever, but after a few million or trillion iterations, the randomness happens to align in such a way that it breaks the paradox (i.e., kills his wife in a new way) and lets the timeline continue past it. What we the audience see is merely the "final cut" version of history, the one that didn't get stuck in an endless loop.
* ''Film/TimeChasers'', which 99 percent of its viewers know from ''Series/MysteryScienceTheater3000''. It tells - or rather, tries to tell - the story a man who invents a time-traveling airplane who has to repeatedly go back and stop his former boss from stealing and exploiting his invention for his own personal gain.

* ''Literature/ElevenTwentyTwoSixtyThree'' gets...''vague'' with how time travel works. At first at seems like traveling to the past always creates a fresh new timeline, or "string," where none of your other trips happened, and if you screw something up, you can always make a new string where you didn't. However, it turns out that the strings can become tangled if there are too many of them, and making changes to history is like plucking the strings, causing them to "harmonize" with each other. If you get too many strings harmonizing, time itself will [[TimeCrash shatter]] from the vibrations. Jake nearly causes this to happen by [[spoiler: saving JFK's life]], but somehow he's able to save the world by making ''another'' string where that doesn't happen. All of this is explained by a hobo who's been driven insane by a very nasty version of RippleEffectProofMemory (imagine remembering hundreds of different futures all at once, all in equal clarity) so there's a lot the reader never finds out.
* ''Literature/{{Animorphs}}'' made use of TimeTravel occasionally, and each time it apparently worked differently. Different techniques of TimeTravel were involved, at least one of which was by use of a [[TimeMachine thingy]] created by the closest thing to a {{God}} in the series, and another (a BadFuture-esque thing) was just flat-out never explained. The bad future was apparently [[spoiler:a dream caused by an advanced being for some reason. Maybe]].
* Eoin Colfer's ''Literature/ArtemisFowl and the Time Paradox'' [[StableTimeLoop does not actually feature any paradoxes]]. The prequel on the other hand... [[spoiler:Specifically, an island was magically removed from normal time for 10,000 years, but the magic is breaking up and time starts running alternately forward and backward at varying speeds. Holly dies, but Artemis fires a shot backwards in time thus killing the [[OurDemonsAreDifferent demon]] who killed her and bringing her back to life. Furthermore, Artemis goes back in time and causes a mosaic of himself to be created hundreds of years in the past, a fact which is only noticed in the present day after he gets back.]] Artemis questions the first paradox, but eventually gives up trying to figure it out.
** In ''Last Guardian'' Opal defies StableTimeLoop by having her past self from ''Time Paradox'' killed, and manages to survive. What Opal's timeline looks like now is anyone's guess.
* ''Literature/TheBookOfAllHours'' duology by Hal Duncan doesn't even try to claim to be otherwise. It's such a mishmash of pocket universes, alternate universes, and paradox that causality can't even be seen with a telescope on a good day. Essentially: think of the universe as a huge piece of vellum on which reality has been written. Then crumple it up. Most characters make such a habit of going not just back and forth in time but ''sideways'' that one [[spoiler:goes back to the day where he, as a child, met his elder self, and that elder self committed suicide... only now, as the elder self, shoots his younger self instead. Nothing happens to the elder]].
* In Connie Willis's stories, the time machine sends you not to your target time-and-place but to the nearest point such that your actions will not change history. (This is consistent with James Hogan's theory mentioned above, though the mechanism is not explicitly stated.) In ''Doomsday Book'' (which shared the Hugo Award in 1993), a history student aiming for England 1328 lands instead in 1348, where she can't affect history because everyone she meets will shortly be dead of the Plague.
* Creator/TerryPratchett's ''Literature/{{Discworld}}'' novels:
** The History Monks are originally presented in ''Discworld/SmallGods'' as ensuring everything happens [[BecauseDestinySaysSo the way it's supposed to]] (although, even then, the monk Lu-Tze decides to ScrewDestiny).
** In ''Discworld/ThiefOfTime'', it's revealed that, following various alterations to the Disc's temporal dimensions, the "true history" barely exists, and their main job is to prevent the Timey-Wimey Ball from imploding.
** In ''Discworld/NightWatch'', when Vimes travels thirty years into the past to become [[MyOwnGrampa his own mentor]], even the monks aren't sure what's happening.
--->'''Lu-Tze:''' For a perfectly logical chain of reasons, Vimes ended back in time even ''looking'' rather like Keel! Eyepatch ''and'' scar! Is that [[TheoryOfNarrativeCausality Narrative Causality]], or [[StableTimeLoop Historical Imperative]], or Just Plain Weird?
** If you try to place the times and events of some books, you will find they take place a couple years before a different book, and at the same time, hundreds of years before the IMMEDIATE SEQUEL of that different book.
** [[WordOfGod Sir Terry]] himself at one point explained that "There are ''no'' inconsistencies in the Discworld books; occasionally, however, there are alternate pasts."
* Creator/JackChalker's ''Literature/DowntimingTheNightside'': People leaping through time can affect changes. If the change is small enough, nothing much happens to the timeline, but significant changes can happen. Karl Marx is killed 3 different times, at 3 different points of his life. At the end of his life, not too significant. After he publishes ''Das Kapital'', not too bad either. '''Before''' he publishes it on the other hand... And this is just the tip of the timey-wimey iceberg.
* In ''[[Literature/JohnnyMaxwellTrilogy Johnny and the Bomb]]'', Pratchett explains that most time travellers forget the original timeline when they return to the new one because of the human tendency to [[WeirdnessCensor accept what's around them as normal]]; but if you really try (or are reminded of it by some useful clue) you can remember how things used to be.
* David Gerrold's ''The Man Who Folded Himself'' features a time-travel belt, which has the traveller completely paranoid about the possibility of a TemporalParadox destroying him. It turns out that {{Temporal Paradox}}es are impossible; TimeTravel rewrites history except for the guy who travelled through time. Various MindScrew moments: [[spoiler:the protagonist has orgies with himself of different ages, writes himself out of history, has a family with himself as a female, eventually has that written out of history (but his son still exists) and culminates in finally giving himself (as the son, so he's his own father) the time travel device. On the last, the idea of where it came from is explored a couple of times and eventually it's hit upon that it's impossible to know where it came from, the creators must have been written out of history. Oh, and he kills {{Jesus}} at an early age. It's okay, he goes back and stops himself after finding out how much it screws with history]].
* Creator/PoulAnderson:
** ''Literature/TimePatrol'' stories are [[ShownTheirWork historically well-researched]] and confusing as '''hell.''' Among other things, the future is "uptime" and the past is "downtime," which makes it sound counterintuitively like time is a river that flows uphill. (This is consistent with convention in geology and archeology, where an earlier period is "lower" because its evidence is in deeper strata.)
** Ditto in the ''1632'' series, the Grantville inhabitants from 2000 are "uptimers," the seventeenth century natives are "downtimers."
** The same terminology is used in [[Creator/IsaacAsimov The End of Eternity]], where use words like "downwhen", "upwhen", "anywhen" and "everywhen".
* ''[[Literature/{{Dragons}} The Last Dragon Chronicles]]'': Oh God. There are too many examples to list, though things start getting particularly crazy from ''Dark Fire'' onward. Taken to extremes in ''The Fire Ascending''.
* Creator/DeanKoontz averted some time travel issues in ''Lightning'' by virtue of having ''the Nazis'' invent time travel, the limitation being that it can only send you ''forward'' (and then you snap back to your point of origin when you make the return trip). While this has its own problems, it at least eliminates the ability to murder your mother before she gave birth to you. You cannot change your own past, but you can change the past of anyone born after you so long as the changes you try to make are not contradictory, and you can bring objects back. Played straight in that if a contradiction is demanded, the portal will refuse the forward transfer (this gets [[spoiler:the heroine killed]] in one timeline). "Destiny struggles to reassert the pattern that was meant to be." Sometimes happily, and sometimes not so happily, it succeeds.
* The ''Never Again'' series starts out simple enough. It seems to follow the many-worlds interpretation of quantum mechanics so that time travelers can do anything they want, but will create a new timeline that never intersects with the old. Then comes the third book, where that is thrown out the window, and the author's attempts to explain what is happening (with a lot of {{Technobabble}} about "intersecting universes" and the like) [[VoodooShark just raises further questions]].
* The character of Phanthro in ''Literature/{{Relativity}}'' is a time-traveller from the distant future. He's constantly altering history (for the fun of it). When he's asked how he can alter the past without wiping his own time period out of existence, he just says, "Time doesn't work that way." No further explanation is ever given.
* Creator/RobertAHeinlein:
** Heinlein wrote a short story called ''Literature/ByHisBootstraps'', in which the protagonist exploits a time machine to move himself forward in time. Simple enough. The MindScrew comes in when [[spoiler: he does this by his future self sending back his intermediate self to persuade his past self to enter the machine's portal. When the past self becomes the intermediate self, he attempts to double cross the future self, but that double cross naturally results in him becoming the future self]]. Follow all that?
** For a real, double whammy version of mind screw, read ''Literature/AllYouZombies'' [[spoiler: which chronicles a young man (later revealed to be post-real-sex change) taken back in time and tricked into impregnating his younger, female self (before s/he underwent said sex change); then he turns out to be the offspring of that union (time-relocated yet again), with the paradoxical result that he is both his own mother and father. As the story unfolds, all the major characters -- the young single mother, her seducer, the alcoholic writer, the bartender who recruits him into the time-travel corps, ''and even the baby'' -- are revealed to be the same person, at different stages of her/his life]]. How's your mind doing now?
* Creator/HarryHarrison's ''Literature/TheStainlessSteelRat Saves the World'' features two overlapping timelines (one of which only has a temporary existence) ''and'' a loop. The lead character travels back in time to stop the Special Corps being removed from history, and manages to disrupt the enemy's plan. He then follows them further back in time, landing in an alternate history where Napoleon conquered Britain. He messes up the controls on the enemy time machine, and (after being rescued shortly before the alternate history disappears) follows them forward (but still long before his own time). He finds the villains (after a ''long'' time for them -- so long they've forgotten everything except that he's the Enemy), but is unable to stop them; they travel back in time, and he's only saved by a time machine -- allowing him to return to his own time -- which he then sends back with the instructions for what he just did. [[spoiler:Finally, he's told not to worry that he didn't stop the villains; they've just travelled to the first place he met them, where they will then travel back and create an alternate history where Napoleon conquered Britain, before...]]
* ''Franchise/StarTrek'': The novel ''Q-Squared'' introduces several alternate realities, including one based on the BadFuture in ''Yesterday's Enterprise''. However, in this case, when the Ent-D finds the Ent-C, all the crew aboard it are already dead. Afraid of Klingons getting their hands on a Federation warship (even an old one), they scuttle it and move on. Oh, and by the end of the novel, that reality is even worse off, since [[spoiler:its Picard and Riker are dead]].
* In ''A Tale of Time City'' by Creator/DianaWynneJones, the titular city exists outside of the flow of history on the rest of the world. From this vantage point, the citizens see that history works like weather patterns -- it shifts back and forth with minute details thanks to the butterfly effect and time loops. Basically, a more detailed explanation of the Timey-Wimey Ball, where shifts in the time travel theories are explained away as the changing "weather patterns" of time. For instance, on one day in Time City the inhabitants may observe that UsefulNotes/WorldWarII begins in 1939, but on another day they may notice that it has changed to 1938. Perhaps time in the book is two-dimensional, with Time City time orthogonal to time everywhere else. [[spoiler:Except it turns out that the history of Time City can shift back and forth too...]]
* In Creator/JasperFforde's ''Literature/ThursdayNext'' novels, not only do the rules of TimeTravel make no sense whatsoever, the main character (whose father is a time-traveller) realises this, and often {{lampshade|Hanging}}s it. In one book, the rules actually seem to change over the course of a conversation with her dad, but she realizes there's no point in even asking.
** In ''[[Literature/ThursdayNext First Among Sequels]]'', there is a subplot revolving around the fact that the time-travellers have mapped almost the entire future and found that TimeTravel has not yet been invented. By the end of the book, [[spoiler:Thursday and co. have managed to ensure that TimeTravel is ''never'' invented, and thus, could never have been used earlier in the series]]. This means that several events from the previous four books including the plays of Creator/WilliamShakespeare [[spoiler:and the ''beginning of all life on earth'']] logically could not have happened. Since many of these events were the results of {{Stable Time Loop}}s anyway, this is a case of Ascended TimeParadox. Or MindScrew turned UpToEleven. Either way, it's probably best just to apply the MST3KMantra and enjoy the series.
** A significant part of the plot of ''The Woman Who Died a Lot'' is that the non-existence of time travel in a world where many people know they ''used'' to work for the [[TimePolice ChronoGuard]] has actually made the Timey-Wimey Ball ''worse''.
* In ''Literature/WeCantRewind'', the narrator makes several attempts to make sense of how his world's peculiar form of time travel works for the readers, and then gives up, explaining that he'll probably [[MindScrew lose his mind]] if he keeps this up for much longer. [[spoiler: He mentions that the temporal theorists of Merciar, from which he's writing this account, are doing no better at settling their controversies over how exactly inter-dimensional time travel works, and that most of Merciar's citizens have already given up trying to make sense of it in order to preserve their sanity and advised everyone else to do the same.]]
* ''VideoGame/WorldOfWarcraft'': The novel trilogy ''War of the Ancients''. Despite some dramatic changes (such as saving an entire race that originally went extinct), it's apparently okay to mess with time as long as the end result is roughly the same. Of course, it also helps explaining why said race appears rather plentiful in ''VideoGame/WorldOfWarcraft'' after having been said to be extinct in an earlier novel...

[[folder:Live-Action TV]]
* ''Series/TwelveMonkeys'': Cole is only chosen for the time-travel mission because there is a recording of Cassandra recovered in 2043 where she mentions him by name, implying some kind of StableTimeLoop is involved (Jones herself says that Cole's destiny is "preordained"). Yet, the entire premise of the series ([[spoiler: unlike the original film]]) is that history is mutable and that the past can be re-written (which is clearly demonstrated when Cole scratches Cassandra's watch, causing a scratch to simultaneously appear on its future counterpart).
* In ''Franchise/{{Arrowverse}}'' time travel has NewRulesAsThePlotDemands pretty much whenever it appears.
** The events of the first season of ''Series/TheFlash2014'' were kickstarted by [[spoiler: Prof. Eobard Thawne]] a.k.a. the Reverse Flash going back in time and killing Nora Allen. He also spends most of the season trying to get back to the future and it's heavily implied that he wants to go back to the same future he left despite going back a few centuries and causing ''massive'' changes.
** Later in the first season Flash performs MentalTimeTravel going back a day despite it being already established that Reverse Flash physically traveled back in time.
** Then season finale came and Barry was supposed to perform physical time travel and prevent his mother from dying by [[ArtisticLicensePhysics running at mach 2 and getting hit by hydrogen particle]]. At the same time Reverse Flash planned to use Barry's travel to get back to the future in some machine he somehow didn't need the first time and definitely not needed by Barry. Long story short [[spoiler: Eobard's ancestor Eddie got killed which erased Eobard from existence, since he'd never be born but it somehow didn't affect anything that he did throughout the season]]. Oh, and as a result Black hole appeared over Central city threatening to destroy the earth.
** Then Reverse Flash returned in season 2 [[spoiler: despite never having been born]]. This was explained by him being protected by some "time bubble" or whatever during his "earlier" time travels. When he gets locked in the pipeline and stopped from going back to the future(from which he would have time traveled again to cause Season 1 to happen) metahuman Vibe is somehow getting erased from existence supposedly because he got powers from Reverse Flash causing explosion of particle accelerator. For some reason only Vibe is affected despite ''every'' metahuman getting his/her powers this way. Flash has to get Reverse Flash back to the future to save Vibe and yet this time it's achieved merely by running fast enough without using the hydrogen particle.
** Several episodes later Flash goes back in time [[spoiler: to talk with Prof. Thawne [[MindScrew before he's prevented from ever being born]]]]. This time he encounters so called Time Wraith which hunts those who travel through time "and don't know what they're doing" ([[FridgeLogic Never mind that this is the first time when he]]''[[FridgeLogic does]]''[[FridgeLogic know what he's doing.]] He has a plan and more or less does exactly what he intended to, even if he had to play a bit of XanatosSpeedChess in the meantime), which have never been so much as ''mentioned'' before.
** Then Series/LegendsOfTomorrow came and things got even messier. Not only Rip Hunter mentions "fixed points in time" which cannot be changed for some reason, but also it is said that changing future is harder than changing past, never mind that "future" in question is actually his past, and that future is completely arbitrary concept in timetravel in the first place. It also mentioned nasty after-effects for health of time travelers which neither Flash nor Reverse-Flash ever experienced.
** Then all logic is thrown out of the whole thing at the end of Season 2 of Flash. Barry goes back in time again to prevent his mother's death and succeeds, in effect just undoing all the changes Reverse Flash caused in the first place. The 3rd season opens with the Flashpoint timeline, a timeline where of course Barry's parents are still alive, but the particle accelerator explosion happened early somehow anyway even though Thawne is the one that made that happen, there are metahumans running around as a result, Wally is The Flash instead of Barry, Barry is gradually losing his powers because in this timeline he never got them for some reason, Joe is a hopeless drunk barely hanging onto his job, while Cisco is filthy rich and Catlin is a Pediatrician. It gets even MORE confusing when Barry subsequently reverses his change, which instead of ending up right back in the timeline as he left it resulted in a timeline where Thawne somehow never became trapped in the past thus should have resulted in the events of the first 2 seasons never happening but again they do anyway, Cisco's bother died in a car crash, Catlin now is developing ice powers, Joe and Iris are on the outs, Barry has a partner at work that never was there before, and there's a supervillain running around giving people who had powers back in Flashpoint powers again for some reason and yet another speedster supervillain behind that.
* ''Series/BlackHoleHigh'': "Fate": When Vaughn, having traveled back in time to meet his mother, steals her hairclip as a memento, [[ForWantOfANail all of history is rewritten]] so that his parents never meet, his father becomes a familyless loser instead of creating the wormhole, and Professor Z doesn't get a scholarship from his company to go to college. Which is all well and good. What no one attempts to explain is why, in this new history, Josie never attended Blake Holsey High (Though later events suggest that her presence there may have been engineered to keep her close to the wormhole). To complicate matters further, it eventually turns out that both Vaughn's mother and Josie's father are {{time travel}}ers, so without Pearson's wormhole (the basis for TimeTravel), Josie shouldn't exist either.
* In Season 8 of ''Series/BuffyTheVampireSlayer'', Future Dark Willow exploits the time travel confusion for all it's worth to manipulate people to her advantage.
* ''Series/{{Charmed}}'' has some rather interesting ideas of how time travel works:
** In one episode, Chris is taken 20 years into the future as a prisoner by a bunch of evil dudes. Before he leaves, he manages to slip in a comment about the "creaky floorboard". The witches take the hint and brew a potion for him to use as a weapon, which they hide under said floorboard. The camera goes back and forth, showing what is happening in the future (Chris facing the bad guys) and the present (the girls hurrying to finish the potion). It's strongly implied that, had they not gotten the potion ready in time (i.e. before Chris in the future is shown looking under the floorboard), Chris would have found nothing. In actual fact though, the girls could have relaxed and spent hours making the potion, it would still have been there 20 years into the future, provided it was never removed from under the floorboard at a later time. Speaking of which, the writers may just have assumed the potion would be gone after the episode, rather than continually being under that floorboard for the next 20 years.
** In another episode, a demon steals little 3-year-old Wyatt's magic powers. Next thing, 20-year-old Wyatt and his brother come time-travelling from the future, saying "We were fighting demons when Wyatt suddenly lost his powers, so we thought we'd come to the point in time where the change occurred and see what happened". This makes no sense in any form of time travel. If 3-year-old Wyatt lost his powers, then 4-year-old and 5-year-old Wyatt wouldn't have had any powers either, all the way up to 20-year-old Wyatt. It would make no sense for him to loose his powers only suddenly at the age of twenty. Not to mention, once they fixed the problem in the present, 20-year-old Wyatt should have never lost his powers in his time at all.
** In another, Chris (having time traveled back to the show's present from the future) is corrupted by demonic influence. They make an antidote for it and Piper, who is pregnant with Chris at the time, drinks the potion. Naturally, this cures the adult Chris after she drinks it rather than preventing him from being corrupted in the first place.
* ''Series/{{Continuum}}'' has a ''literal'' Timey-Wimey ball, since there are eight pieces that magnetically grab onto each other and when they do so in the presence of sufficient power, it activates and zaps anyone within a certain radius to a new destination time.
* ''Series/DarkShadows'':
** Barnabas Collins travels back in time to save Collinwood from the ghost of Quentin. When he returns, Amy and David still remember being tormented by Quentin's ghost, despite the fact that [[spoiler:with the change in history, Quentin never died and is still alive]].
** Despite the times [[spoiler:Barnabas is released from his coffin when he travels back to 1897, and then to 1840]], he still has a history with the Collins family in the present era.
** The fact that [[spoiler:Quentin, Tad, and Desmond Collins survived in 1840, thanks to Barnabas and Julia, changing the line of inheritance]], does not seem to have any impact on the Collins family in the present day.
* The {{Trope Namer|s}}, ''Series/DoctorWho'': As a roughly consistent general rule, {{Stable Time Loop}}s work, but [[GrandfatherParadox doing something that will prevent you from going back in the first place]] has varying degrees of bad consequences. The specifics, however, are complicated enough to warrant [[TimeyWimeyBall/DoctorWho their own subpage]].
* ''Series/TheGhostsOfMotleyHall'' a series told from the point of view of the ghosts from various eras who haunt a derelict stately home in England discover one Christmas that, for no reason ever explained, the house has slipped through time to the Victorian era. The ghost of Sir George meets and talks to a young boy who is excited about his presents. Sir George realizes the boy is himself, and only then recalls a vague memory of having met an elderly man on Christmas Eve, who he had assumed to be some distant relative whom he never saw again.
* ''Series/TheGirlFromTomorrow'' has a very large one: Tulista travels back through time and retrieves Silverthorn. Taking him out of the timeline should screw with the future, but doesn't, thanks to one very DelayedRippleEffect. Silverthorn then takes Alana back to 1990, and their presence in the timeline again fails to interfere with the future properly. It's only after Alana takes them both back to the year 3000 that people begin to notice the DelayedRippleEffect, despite the fact that if anything, it should have interfered with two time periods. They then attempt to resolve this by returning Silverthorn and Jenny to their respective time periods, only to have the capsule somehow U-turn and return to 2500, meaning there are (briefly) duplicates of Alana and Lorien. This is further compounded when Silverthorn builds a PortalToThePast to get some nuclear bombs. [[spoiler:This is only resolved when Petey resets the Portal to send Silverthorn and Draco to 70,000,000 BC.]] Given what Petey says at the end of the series and the events during "Tomorrow's End", it looks [[spoiler: like the entire series is actually a StableTimeLoop]]
* ''Series/{{Heroes}}'' can't decide if they are going for Static Time Travelling or a Dynamic Time Travelling. And that's the least problematic thing.
** Strangely, it seems the farther into the future they see, the more pliable time becomes. For example, if Hiro tries to fix something close to the present, for example, saving Charlie's life, or capturing Usutsu, it's impossible. Can't change it no matter how hard they try. However, the apocalyptic future they inevitably go to in every single season so far, they always find a way to avert that. Well, usually, that seems to be changing for season three, and even before that, some things were constant across all the alternate futures. Peter's scar, and Hiro being badass with a sword.
** Listen carefully; in the Heroes-verse, time has '''[[http://en.wikipedia.org/wiki/Torsion_(mechanics) torsion!]]''' This means that one can SetRightWhatOnceWentWrong only with "leverage"; only the passage of sufficient time permits time to be altered, thus preventing {{seers}} and TimeTravel from being a DeusExMachina!
** The Charlie issue was kind of resolved in a "she's already dying" way rather than "time travel won't let me save her" way; this is more or less repeated with his father in the next season (only "it's his time" this time, instead of the already dying thing). As for the random jumps through time... he spends the rest of the season learning to control his ability; it turns out he just needed to get back the self-confidence which he had lost since he realized he couldn't save Charlie. The time jumps are a bit convenient, and that Hiro's explanation makes no sense doesn't help. Not to mention that nothing else they've done with time travel has made any sense. They don't even try to be consistent, it seems. Very comic booky... which is probably the point. Still makes for bad headaches, point or no.
** However, The Heroes novel '''Saving Charlie''' took the opposite tactic, implying that Time/God wouldn't let Hiro save Charlie because YouCantFightFate. Over the course of the story, Hiro lost control of his powers several times in the past while he was trying to romance Charlie and wound up "jumping" to key locations relating to his quest to save Claire Bennet. Eventually, Charlie figures out what is going on, tells Hiro he must face his destiny even if it doesn't involve her and the two lose their virginity together the evening before Charlie goes into work, meets Hiro for the first time and then gets killed by Sylar.
** THEN HE SAVED CHARLIE. No, really. Seasons later, Hiro goes back in time, and gets none other than Sylar (the ''season one'' Sylar who'd ''never'' toyed with the idea of a HeelFaceTurn) to repair Charlie's aneurysm telekinetically ''and'' leave her brains on the inside in exchange for non-TimeCrash-inducing information about his own future. However, she's kidnapped by the BigBad of ''that'' season, and Hiro doesn't see her again until she's an old woman who's lived a happy life that Hiro wasn't going to undo so he could have her. Still, it was pretty awesome to see Hiro turn "YouCantFightFate" into "[[ScrewDestiny Up yours, fate]]!"
** According to [[Wiki/{{Wikipedia}} The Other Wiki]], Hiro can change history as long as he doesn't eliminate his own cause for traveling in time. However, while this rule is sometimes played straight (he can't simply teleport Sylar away, as that would prevent him from meeting Charlie in the first place and he couldn't save her) but other times... not so much (his attempts to save the suicidal employee would eliminate his reason for time travel but it never works out that way. Of course, history doesn't actually wind up changing in that case, so it may not be a contradiction after all).
* The Israeli drama ''The Island'''s basic premise relies on this and (after the first season) fighting the BigBad, who keeps trying to MakeWrongWhatOnceWentRight.
* ''Series/KamenRiderDenO'' spikes the Timey-Wimey Ball like no other:
** When an [[MonsterOfTheWeek Imagin]] wreaks havoc in the past, it's translated into the present oddly. For example, if you were standing next to a bridge support, and an Imagin went to last year and broke it, you would see it vanish into thin air ''now'' (as opposed to, say, remembering that time a year ago when they had to fix the bridge 'cause a monster trashed it). But since it was trashed in the past, it had to have been rebuilt at some point, right? Apparently, when an Imagin breaks something, the fix's [[NoOntologicalInertia Ontological Inertia]] fails [[SanDimasTime shortly after the time the Imagin went back]]. Now ''that's'' the Timey-Wimey Ball at its wibbly-wobbliest.
** When the Imagin is killed, the Timey-Wimey Ball then uses the original memories of people in the future to repair the damage to the past. However, anything or anyone who is not remembered is not restored. So now no-one remembers the bridge getting repaired because as far as [[{{Muggles}} the great unwashed masses]] know, ''it was never broken in the first place''.
** In the crossover movie ''[[Series/KamenRiderOOO OOO]], Den-O, All Riders: Let's Go Kamen Riders'', an elaborate TemporalParadox was revealed when we learned Naoki is [[spoiler: Mitsuru's father]]. They didn't even try to explain it. This is a paradox because Naoki was [[spoiler: stranded in the past after time had already been changed. The version of 1973 that led to the 2010 ''we'' know did ''not'' have Naoki in it. Therefore, Mitsuru]] ''should not exist'' in the 2010 we know.
** The original ''Series/KamenRider'' has two friends of Goro's by the names of... [[spoiler: Naoki and Mitsuru]]. We meet them in the latter third of the series. Whether ''Let's Go Kamen Riders'' is trying to say that they [[spoiler: are the same ones and we didn't know they were time travellers]] is hard to tell, but if that's what it means, it's certainly interesting. However, this adds another level to the timey-wimey: a 1973 with ''Let's Go Kamen Riders'' having happened led to the ''Franchise/KamenRider'' universe proceeding in the manner we saw in the older shows, even though the whole movie is that the Den-Liner gang's trip leads to a BadFuture which [[spoiler: got a happy ending in the present, but can't ever be erased]].
* ''Series/QuantumLeap'':
** When a Mad Scientist[=/=]Children's TV host proposes that everyone's lives are strings and if you could tie the ends together you should be able to travel along that string, Sam agrees that he is basically right, but that it is important that you ball up that string first so that all the days of your life touch. Which makes sense.
** As revealed in the finale, all time travel is monitored by {{God}} to create the best possible timeline and presumably keeps Leapers and good people from being erased by paradox and such.
* ''Series/RedDwarf'':
** Just about any time travel episode, but most especially the Season 6 cliffhanger in which the Dwarfers' [[FutureMeScaresMe scary future selves]] blow up Starbug, apparently killing everyone on board. Season 7 opens with Lister explaining direct to camera that, because they'd been killed, their future selves never existed to come back, therefore they hadn't been killed, and this is also why Starbug is suddenly bigger. The intelligent video camera suffers a [[strike:nervous]] {{explosive|Instrumentation}} breakdown trying to understand this.
** Ironically, Rimmer's plan in the cliffhanger episode, which was to destroy the Time Drive so that their future selves couldn't come back to kill them, would have made far more sense as an explanation.
** And later in that same episode, The Boys From the Dwarf violate the same laws that allowed them to survive after they take UsefulNotes/JohnFKennedy back in time to assassinate his past self!
** In "Future Echoes", Rimmer tries to explain Timey-Wimey to Lister:
-->'''Lister:''' Hey, it hasn't happened, has it? It has "will have going to have happened" happened, but it hasn't actually ''happened'' happened yet, [[FunetikAksent hactually.]]\\
'''Rimmer:''' Poppycock! [[TimeTravelTenseTrouble It will be happened; it shall be going to be happening; it will be was an event that could will have been taken place in the future.]] Simple as that. Your bucket's been kicked, baby.
** The first two times time travel came up a StableTimeLoop was established as far as anyone could tell.
* Many descriptions of ''Series/SapphireAndSteel'' imply it's a TimePolice show. Instead, it uses time travel -- and the rules thereto -- like a CopShow uses criminal procedure: arbitrarily.
* ''Series/SevenDays''. It is a rather harsh ground here, since the time machine is alien technology that was badly fixed by humans and due to possibly some screw up (or just plot convenience) it has all kinds of weird side effects. Anyway, when it works like it is supposed to do, it sends you back seven days and your old self and the time machine vanish, either erasing the "bad" timeline or creating an alternate. It is consistent in that. People notice the machine and him vanishing, the episodes are just mostly centered on Parker and until he makes his call they don't know what happened.
** There was an episode where an accident during time travel splits Parker into a good and an [[EvilTwin evil version]]. The good version is killed, so the evil version is sent back in time ''again'', creating another ''good'' version.
** It's difficult to count the number of times the machine has ''not'' worked right. For just a few examples: it brought a person back from the dead (nearly unraveling all of reality), put Parker into the body of Pope John Paul II, created a MirrorUniverse (almost literally, since all writing is in mirrored English), etc. It's a wonder the aliens don't show up to tell the humans to stop messing around with technology they don't understand before they destroy the universe. Then again, they probably don't know and have never bothered to look for their missing prison transport (or that other ship that crashed in Siberia).
* The ''Series/StargateSG1'' episode "1969" dealt with a StableTimeLoop. Following that, however, all the Stargate series have just treated time travel as only affecting things after the initial entry point. Time is changed in both "2010" and "Moebius" without creating a stable loop. Same with "Unending". The DVD movie ''Continuum'' is a bit more complex, since it added a new element to the mix, but ultimately results in the same thing.
* ''Series/StargateAtlantis'' had two episodes in the vein of "2010" and "Moebius", following pretty much the exact same conventions in both.
* ''Series/StargateUniverse'' also sticks to the formula, first with the episode "Time". A Kino is found, which has a recording of horrible death. This recording shows a way to avert it, but they fail to do so and send a ''second'' Kino back. That one, along with the first, does the job. Then comes "Twin Destinies". [[spoiler:In this one, a wormhole connected to Earth from inside a star somehow catapults the ''entire ship'' back in time. Telford (In the time shifted ship) goes through the gate and makes it back to Earth, while the rest of the crew (except Rush) go through when the gate is unstable and get transported to a local stargate hundreds of years in the past while leaving behind Rush, who stays on the ship. The current timeline crew stripped the time-displaced copy for parts, while the extra Rush and the original Telford on ''Destiny'' died. Meanwhile the version of the crew sent into the past establishes the civilization of Novus, leading to the present day crew eventually meeting their own descendents in the following two parter.]]
* ''Series/StarTrekDeepSpaceNine'':
** The series has the relation between Benjamin Sisko and The Prophets. While it appears to be a StableTimeLoop, there just enough wrong with it that it fits here. In the first episode, Sisko meets The Prophets, who live outside of time, and have great difficulty even conceiving of a 'linear' existence. They and Sisko have a nice chat, and Sisko tells them that the Bajorans revere them as gods, it seems that The Prophets weren't really aware of this. It gets tricky from here... [[spoiler:As the Prophets seem to 'get' their position, they then (not that the flow of time should mean anything here...) start doing all the things that they are revered as gods for. Okay, one loop, fairly simple OntologicalParadox. Later on, viewers find out that Sisko was born from a relationship his father had with a woman possessed by a Prophet with the explicit purpose of conceiving Sisko. So, Sisko visiting the Prophets made it possible for him to be born in the first place, so that he could visit the Prophets and tell them that they were gods. Keep in mind that if Sisko didn't tell them they were gods, they wouldn't need Sisko, they would have just kept on being non-linear, not to mention the enormous effect the resulting lack of religion would have on Bajor. Now what really twists the boat is that The Prophets are supposed to exist outside time, yet they clearly change after Sisko's first meeting. So they possess both timelessness (from being able to interact with anytime freely) and their own timeline (Which is clearly affected by Siskos visit)]] These paradoxes and timey-wimey balls are not really explored in the series (though more 'common' forms of time travel are) and the series can be enjoyed without worrying about the timeline of timeless entities. Still, there's rather a lack of coherency.
** The whole thing gets kind of {{lampshade|Hanging}}d, when two versions of O'Brien try to figure out the paradoxes and give it up, simultaneously saying, "I ''hate'' temporal mechanics!" The episode in question, "Visionary", is quite Timey-Wimey in itself, as O'Brien keeps jumping five hours into the future and back, with varying changes once the station reaches that point he jumped to. [[spoiler: He even avoids death twice, first by avoiding a booby-trapped surveillance device that killed his future self, then by having Dr. Bashir perform a specific scan on him after finding out the results of his own autopsy. In the final jump, though, Past!O'Brien ends up dying from radiation poisoning, sending Future!O'Brien back 3 1/2 hours to stop the Romulan attack on the station. The resulting O'Brien has issues with his place in the universe for a while afterward.]]
** ''Series/StarTrekDeepSpaceNine'''s Sisko and his companions are visited by the Department of Temporal Investigations in ''Trials and Tribble-ations''. The agents mention that they have an extensive file on captain James T. Kirk. They also hate {{Predestination Paradox}}es and jokes.
** This episode also involves a ''literal'' Timey-Wimey Ball, the "Orb of Time"
** Another episode had the Prophets bring a famous Bajoran poet forward in time. After they sent him back, all the copies of his famous unfinished poem suddenly showed it as finished. The characters understand that part, but they never figure out how the Prophets made it so that it still ''hadn't'' been complete until after his visit. So there's a timeline where he disappeared into the future, and then after he went back there's a timeline where he went back, but somehow the second doesn't overwrite the first it just picks up where the first left off.
* ''Series/StarTrekEnterprise'': The whole Xindi arc is a big example. So the Sphere Builders tell the Xindi to go nuke Earth, because they know (through their semi-time-travel) that in the 26th century, Earth will come kick their ass. So the Xindi go do a preliminary Earth nuking, which causes the Humans to come over and kick their ass, now. The Sphere Builders ''misled'' the Xindi into believing that humanity ''will destroy'' the new Xindi homeworld, because the Sphere Builders knew that, in the 26th Century, the Federation (which by then will include the Xindi) will decisively defeat the Sphere Builders at Procyon V.
* ''Series/StarTrekVoyager''
** In the 29th century, TheFederation has become a sort of TimePolice, making sure no one messes with history. The fact that the previous (chronologically) series have never had a problem with timecops showing up is not addressed. They were even admonished that they ought to have been held to account before. Not to mention, if they did, [[MindScrew the audience would never know about it]]...[[note]]Mind you, if 29th century TheFederation were to start messing with events that happened in their past, that would itself create a time paradox, and thus their own rules prohibit them from policing any temporal incursions that occurred prior to their becoming the TimePolice.[[/note]]
** The episode contained the morally questionable practice of arresting and trying a man for a crime he ''had yet to commit''. The rather profound implications of this are casually {{handwave}}d with an assurance that he'll be combined with his future selves somehow before the trial, never mind that said future selves are already part of a TemporalParadox since it would presumably be impossible for him to carry out the crime once he'd been arrested for it. This might not be so troubling if it weren't clear that his future selves were suffering from some kind of severe psychological breakdown, the present self would not decide to commit the crime for many years and thus could not be said to have intent, and being removed from command at this early point would have prevented said psychological breakdown from occurring in the first place. Given equal apparent opportunity to prevent someone from becoming a criminal before it was too late, or punishing him for merely being capable, under the right circumstances, of going through with it, which would you choose? Apparently TheFederation, at least according to Voyager's writers, prefers the latter. ''And'' the guy's future self was only mentally unstable ''because'' said TimePolice had ''already'' "somehow combined" him with yet another version from an alternate timeline, who had been stranded for decades as a homeless guy on 20th century Earth. One would think they'd get the hint that "combining" people from different timelines is a bad idea...
** ''Series/StarTrekVoyager'' also had one of the most illogical time travel plots. They're passing a planet and detect a massive explosion. They investigate the planet and find no life. Janeway and Paris are transported back to before the explosion. It turns out that Voyager's attempts to reclaim them caused the explosion. Janeway stops their next attempt by firing her phaser into the time-portal technobabble thingy, which pushes the ResetButton and they pass the planet without incident. The entire episode ignores that they never intended to go to the planet in the first place, so the whole thing never should have gotten started, since there never would have been an explosion to cause them to investigate.
** Also a major question mark inherent in the finale episode "Endgame". [[InsaneAdmiral Admiral Janeway]] from 2404 decides to go back and change the past because three of her favorite crew members did not get happy endings due to ''Voyager's'' decades-long journey home. To achieve this she needs help from her old crew (and one of their daughters). The problem of everybody having the last few decades of their lives erased and replaced with an uncertain alternate timeline engineered by Janeway is kind of glossed over, leaving the question of whether she actually changed history or simply created a new timeline.
* ''Series/StarTrekTheNextGeneration'':
** No list of Star Trek [[BuffySpeak timey-whatever-things]]... is complete without ''Yesterday's Enterprise''. The fact that it brought back Tasha and had [[RuleofCool Klingons fighting the Ent-C]] aside, it made ''absolutely no sense''.
** A quote from Jonathan Frakes re: ''Yesterday's Enterprise'': "To this day I do not understand ''Yesterday's Enterprise''. I do not know what the fuck happened in that episode. I'm still trying to understand it ... but I liked the look." This would become pretty darn HilariousInHindsight, given his ''Trek'' cinematic directorial debut featured both time travel and a revamped color scheme for the ''Enterprise''.
** This one isn't all that hard as far as paradoxes go. During the Battle of Narendra III, the Enterprise-C made a HeroicSacrifice against the Romulans attacking the Klingon outpost. This is exactly the kind of honorable, selfless action that would impress a {{Proud Warrior Race|Guy}} like the Klingons and eventually led to a peace treaty between them and the Federation. However, during the battle, a massive explosion caused a NegativeSpaceWedgie to form, sending the Enterprise-C to the present. But without the Enterprise-C's presence at the battle, the peace treaty would have never formed, either because their sacrifice made the necessary improvements or their disappearance convinced the Klingons that the Federation were {{Dirty Coward}}s and things got worse. So once the Enterprise-C arrives in the present, the present almost immediately becomes a BadFuture where the Federation and Klingon Empire have been at war for decades. As a Klingon, Worf was probably dead as the Enterprise-C wasn't there to defend his colony and he certainly wasn't rescued by Sergey Rozhenko. Tasha Yar is presumably alive because the Enterprise-D never went to the planet she died on, because it is a warship not an exploration ship. The Enterprise-D helps repair the -C enough to send it back through so it can be destroyed as it should have. But Tasha Yar discovers from Guinean (who has some alteration-proof sense of how the timeline is ''supposed'' to be) that she died a [[RedShirt pointless death]] in the "normal" timeline. So she volunteers to go back with the understaffed -C. The Enterprise-C goes back to the Battle of Narendra III and is destroyed. It's revealed later that the Romulans captured several survivors, including Tasha from the war-timeline. So all in all, a bit ''complicated'', but not all that hard to understand.
*** Its much simpler if one looks at from the perspective of the Enterprise-C: in the middle of a battle, when they get sucked into a BadFuture, one which hinged on their disappearance mid-battle. The future folks help repair their ship, then send them back in time to avert the bad timeline in favor of one they all hope will be better.
* ''Series/{{Supernatural}}'':
** "In The Beginning," established that while time travelers can make small changes, they will ultimately lead to the same result because destiny cannot be changed. This is ultimately proven true when Dean's attempt to protect his family from the Yellow-Eyed Demon ends up causing his mother to make the deal with him that eventually kills her.
*** There is a bit of confusion after Dean convinces his father, John, to buy the Impala Dean himself will eventually inherit instead of the VW Bug John had initially intended to buy to impress girlfriend Mary, Dean's eventual mother. Would John have bought the VW Bug if Dean had not interrupted with his suggestion?
** "My Heart Will Go On" blatantly contradicts this by having an angel go back in time and stop the Titanic from ever sinking, preventing anyone on board from dying and leading to hundreds of their descendents who originally never existed appearing in the present. However, the angel who un-sinks the Titanic also states that ever since the Apocalypse was averted, the old rules no longer apply (presumably because the CelestialBureaucracy is in disarray and can't afford to be watching over every minute detail in order to ensure that it all leads up to its supposed "destiny" anymore.)
** "Frontierland" circles back to no major changes, but it's a little unclear whether Sam and Dean's actions are a StableTimeLoop or YouAlreadyChangedThePast.
*** Much like in "In the Beginning", "The Vessel" presents a confusing question as to whether history stayed the same in spite of Dean's presence, or if Dean's presence inspired the events that become history as he knows it. [[spoiler: The boat is sunk by the use of the Hand of God to sink the German sub, but the crew didn't know about the sub or the Hand of God until Dean made them aware of them.]]
* While each ''Franchise/{{Terminator}}'' movie managed to be internally consistent, ''Series/TerminatorTheSarahConnorChronicles'' combined the continuities of the first two movies and then added some of its own time travel plotlines. Predictably, it's getting a little weird.
** The episode "Complications" is particularly troublesome. It introduces a new stable time loop and strongly implies that Derek and Jesse don't come from the same version of the future.
** Later in the series, there's so much timeline alteration going on the human time travelers start using the ever-shifting date of Judgment Day to determine which timeline they came from.
** There's also the terminator that was sent to the wrong year and ended up having to build a building. Things get complicated when you try and work out how such an early intrusion into the timestream plays out with all the time-travel shenanigans already going on. Being a new model terminator at the earliest point in time raises many questions. Did that one with new orders cause the current events? Would it still arrive in the past if that chain of events were excised?
* ''Series/{{Timeslip}}'', a 1970s British series, presented a form of time travel where the past, not "really" being able to "happen again" is "fixed" -- by which they mean that you can interact with the people there, but not alter events, and can be hurt, but not "seriously". In the first serial, a time traveler is ''shot dead'', and collapses, unconscious, leaving blood, but ''no wound''. She wakes up, but still feels the pain of having been shot. You get the first minute of a muddled explanation about it being a sort of shared hallucination before it's dismissed as too complicated to explain.
* ''Series/TimeTrax'' can't seems to decide if [[TimePolice Darien]] and the fugitives are in their own past or a time-shifted parallel universe. Most episodes appear to take the second option, insisting that their own time remains unchanged no matter what happens in the "past". On the other hand, in some episodes, Darien has SELMA leave coded messages in the classifieds for his boss in the 22nd century, which would only be possible in the first version. No one seems concerned about any temporal paradoxes, though, and Darien's goal is not to prevent any changes but to catch escaped criminals. One episode is notable for having both versions: Darien insists that, due to everything that has already been altered by the time travelers, an aspiring country singer may no longer become the star she was in his own history. At the same time, he accidentally becomes the inspiration for his favorite song.

[[folder:Tabletop Games]]
* ''TabletopGame/{{Warhammer 40000}}'':
** This is a fundamental quality of [[HyperspaceIsAScaryPlace Warp travel]] given that the flow of time relative to realspace changes randomly during transit. Navigation for [[TheEmpire The Imperium of Mankind]] requires the use of psychic Navigators to essentially ''feel'' their way to their destination, avoiding the worst of the [[SpaceIsAnOcean warp storms and riding favourable currents]] to reach their destination. However, given the abovementioned mutability of time along the way, ''when'' you arrive is anyone's guess. The crew could be in transit for weeks or months at a time to arrive at their destination at the same time as when they left, centuries late, or even ''before they set out'', if you even get there at all. A graphical history for a given ship would more closely resemble a circuit diagram than a timeline if plotted out.
** One specific example had an Ork leader accidentally end up at his starting location just before the fleet left, and then promptly attacked and killed his past self to get a spare of his favorite gun (the Waaagh! disbanded in the ensuing confusion).
** There is also a long-running war between Eldar Farseers (who can manipulate current events to change the future) and actual time travelers from the Necron dynasties and Imperial Inquisition (who may or may not have accidentally erased themselves from the timeline).
** One Imperial ship responded to a distress signal, but was ambushed in the Warp. Just before its destruction it managed to send out a distress signal...
* ''TabletopGame/FengShui'' uses this trope quite effectively: The heroes can jump between [[SanDimasTime 4 points in history]] by using the Netherworld. Transferring control of enough Feng Shui sites changes the future completely, except for anyone who's [[RippleEffectProofMemory visited the Netherworld]].

[[folder:Video Games]]
* Completely {{averted|Trope}} in the indie RTS ''VideoGame/{{Achron}}''. The time travel is completely consistent, despite the game handing the players tools to: change the rate time flows around them, give orders to units in the past, ''send'' units into the past using time travel, and create [[GrandfatherParadox time paradoxes]]... in competitive multiplayer. Bonus points for the system still managing to be fairly easy to learn.
* ''VideoGame/ApolloJusticeAceAttorney'' manages the difficult trick of pulling this off in a game that ''doesn't feature time travel.'' [[spoiler: In the last episode, Phoenix's investigation as shown would not be possible unless he could actually travel through time, rather than being able to select different times just being a tool for the convenience of the Jury. He uses evidence he gathers in the present in the past, as well as evidence he gathers later in the same portion of the timeline in earlier incidents.]] Justified in that the Investigation you see is a simulated version being [[spoiler:played out by the Jurists.]]
* ''VideoGame/BackToTheFuture: The Game'' confuses the series' time travel mechanics even further, [[spoiler: when Marty and Doc inadvertently create a timeline where Emmett Brown never creates the time machine in the first place (and in fact never becomes "Doc" Brown). While Marty is unaffected by the changes in the timeline (so long as it doesn't result in his erasure from existence, as usual), Doc actually disappears from the [=DeLorean=] once they land in 1985. The [=DeLorean=] doesn't start to disappear until Marty managed to get the 1931 timeline mostly straightened out, but only after another Doc Brown travelled back from 1986 to pick up Marty, and it took days for the thing to finally vanish]].
* Deconstructed in ''VideoGame/{{Bastion}}''. [[spoiler:The narrator gets several serious cases of deja vu retelling the story of The Kid to his audience, and one of the game's endings directly lead into the beginning of NewGamePlus.]]
* To say that this trope pops up in ''VideoGame/BioShockInfinite'' is like saying there's some water in the Atlantic Ocean. So you're hired to retrieve a girl from a floating city run by a racist madman who believes himself to be the American Jesus. Seems simple enough. Then you find out the girl can rend spacetime, [[spoiler: go on trips to multiple time lines, find out the girl is the daughter you sold away in one possible world, and that the bad guy is a possible you]].
* While ''VideoGame/ChronoTrigger'' was generally consistent about how its time travel worked, there were a few odd instances.
** Somehow Marle [[TemporalParadox paradoxed]] herself out of existence, despite time travelers not being directly affected by any other changes they'd made during the game. For instance, you can save Lucca's mom, but Lucca still remembers when she was crippled instead of having all her memories changed. Or when the future Robo came from was ''erased from existence'' without affecting him.
*** For Lucca, it's uncertain if she remembers her mother being paraplegic. After saving her and returning to the present, you can visit her and see she walking, but nobody (not even Lucca herself) comments on this.
** The Timey-Wimey Ball also applies to game mechanics: One can open a chest in the future, return to the past and open the chest ''again'' to get two items from the same chest.
** This also means that it is possible to beat the [[BonusDungeon optional dungeon]] at the end of the game 3 times. However, if you start by beating the earliest version of it the newer versions will also be empty.
** According to the staff members, they never quite got a consistent set of rules down for time travel until they had already written themselves into a corner, so they just went with what they had.
** ''VideoGame/ChronoCross'' tries to patch things up by using [[HandWave parallel realities]] as the ultimate outcome of fiddling about with temporal mechanics, and then showing the physical effect of a catastrophic temporal paradox via the TimeCrash (wherein a time experiment pulled a city borne from the "good" future back to the past, and its opposite number from ''another'' alternate reality was ripped from its native timeline as cosmic counterbalance; the "time refugees" created the archipelago the game takes place in, and ultimately things happened leading to an alternate reality where the "bad" future is still set to occur.)
* The ''VideoGame/CommandAndConquerRedAlertSeries'' - seriously, the series by now has something in the range of 2 separate timelines from the [[VideoGame/CommandAndConquerRedAlert first game]], two from [[VideoGame/CommandAndConquerRedAlert2 the second]], two from that game's expansion, and then three from [[VideoGame/CommandAndConquerRedAlert3 the third game]], with a further three paths from THAT game's expansion. Even more brain-busting, ''Red Alert'' led to ''[[VideoGame/CommandAndConquerTiberianDawn Tiberian Dawn]]'' by way of Allies winning both ''Red Alert 1'' and ''2'' - ''Red Alert 3'' is made by way as a divergence at the end of ''Red Alert 2''. Add to that the events of ''Yuri's Revenge'' which is its own separate divergence and has the nice consequence of there being two "commanders" (the player) in different places at the same point in the timeline, although the divergent timelines are merged at the end.
* ''VideoGame/DarkSouls'': The Player Character is told from the beginning that time in Lordran is inconsistent; everyone has their own "world" (i.e. timeline) wherein their own pasts and futures proceed in the standard way, but each of these worlds is technically separate from every other. Occasionally, two or more worlds can overlap temporarily and their inhabitants interact. The catalysts vary - people can leave messages for one another, including "Summoning Signs" that allow other travelers to request their aid, while other times these overlaps just occur naturally. Alternatively, certain "Orb" items can be used by players to invade other worlds to kill the hosts.
* ''VideoGame/DayOfTheTentacle'', is extremely wibbly-wobbly timey-wimey. The game runs on SanDimasTime to allow the characters to flush small, inanimate objects to each other through time via their time machines. When the time stream is altered, any changes are visible to the characters and happen with a "magic" effect and sound, and at the end of the game, [[spoiler: the characters travel back in time to yesterday to turn off the machine that caused the BigBad to become evil,]] thus causing a huge paradox and defeating the point of them even disembarking on their adventure in the first place. But [[RuleOfFunny that's okay.]] Doctor Edison's ''original plan'' (not taking into account the diamond breaking and the trio ending up in different eras) was for them to simply go back in time and turn off the aforementioned machine.
* ''VideoGame/DragonQuest'':
** ''VideoGame/DragonQuestV'' has a literal Timey-Wimey Ball. As a child, your character finds a golden orb which doesn't seem too important. A bit later, you meet a stranger who asks you if he can have a look at it. At one point, the leader of an evil cult destroys the orb for no apparent reason at the time. After a timeskip and many hours of gameplay, [[spoiler:your character, now an adult, finds out that the golden orb was really the power source of a floating castle. You then receive a fake golden orb, go back to the time of your childhood through a magic painting and secretly exchange the orbs with your younger self and return to the present with the real one, meaning that the cult leader only destroyed the fake]].
** ''VideoGame/DragonQuestVII'' takes it UpToEleven by centering the entire game around traveling to different times and places in order to restore the world... Good luck with keeping the different time lines straight.
* The activation of the god-golem Numidium in the conclusion of ''VideoGame/TheElderScrollsIIDaggerfall'' allowed for several mutually-exclusive [[MultipleEndings endings]]. The story-writers decided the simplest answer to this situation was for ''all'' of them to be true; the lore-writers followed suit. Cue the Dragonbreak, a moment in history where the Numidium's activation was so powerful it ''broke time''. Time followed every possible path the player could follow, each time ending with Numidium's destruction... and then time snapped back together and every event became part of the new reality.
** This has resulted in interesting paradoxes, including the existence of both the Worm God and Worm King, when they are both Mannimarco and should only be one or the other.
** Generally, Dragon Breaks are closely related to the lore's concept of "Hero" (all PlayerCharacters in the series are considered Heroes), an individual that is ImmuneToFate, which allows the world's fate to continue despite the myriad ways the Hero can affect the game world (often in contradictory ways in different playthroughs).
* ''VideoGame/EscapeFromMonkeyIsland'':
** One puzzle involves a time-travel maze where, at one point, you encounter your future self (and, later on, your past self, in exactly the same situation only controlling the other Guybrush). Taking an incorrect course of action (usually saying something wrong as the future self) creates a "paradox" that throws you back to the start of the maze. The puzzle goes a long way towards demonstrating the problems with a StableTimeLoop.
** There's also the three items you get from your future self, and have to give to your past self. Where do they come from? Where do they go?
** "I guess you ''are'' more likely to shoot yourself." Cue the SwirlyEnergyThingy.
* Despite only reading about the past rather than visiting it, ''VideoGame/EternalDarkness'' uses a rather... [[MindScrew unconventional]] form of this in the ending of the third play-through. Near the start of the first one, you picked one of three artifacts which would end up being the BigBad. In the second play-through, that artifact was gone and you picked from the remainder; the ending was basically the same as if you had picked THAT artifact first, but the voice-over states that "something seems to remain". The third one was the same, leaving a single option; the third ending shows that all three events happened ''simultaneously'', and were in fact the only way for Mantorok - the only even quasi-good member of a pantheon of four [[EldritchAbomination godlike beings that exist outside of time and space]] - to destroy his hideously evil counterparts. This opens up the NewGamePlus and allows for [[CatharsisFactor very satisfying cheats]], but the ending in this final "joined together" timeline states that Mantorok itself is still [[AndIMustScream sealed]], [[FateWorseThanDeath rotting]], [[SequelHook scheming]]...
* ''VideoGame/FinalFantasyXIII2'' has a case of this once you get into the multiple time-streams. One specific example is that a solution to being trapped in an insane building by a computer trying to kill you is to scream at Hope, who is in the original timeline in the distant past and will see the video and not create the insane computer.
* ''VideoGame/FireEmblemAwakening'' has some minor, weird cases of this. Midway through the game, you can start recruiting [[spoiler: the main cast's [[KidFromTheFuture future children]]]], who all time-traveled to the point of the main quest. However, one of them ended up three years earlier than the rest of them for completely unexplained reasons, ''technically'' making him the oldest of the bunch. Plus, Morgan, [[spoiler: the Avatar's exclusive child]], is speculated to have come from [[AlternateUniverse a different timeline]] than the rest, which would ''have'' to be the case with some of the possible pairings ([[spoiler:particularly if the Avatar marries a 2nd-gen character]]). To add to the confusion, various dialogues and [=DLCs=] (particularly "The Future Past") imply all of the above-mentioned time-travelers would be more accurately described as {{Dimensional Traveler}}s.
* ''VideoGame/LegacyOfKain.'' Time-travel, paradoxes, {{Decoy Getaway}}s, and so much more! It would take an entire page on its own to list everything... but you can always see for yourself at the [[http://en.wikipedia.org/wiki/ other wiki]].
* ''Franchise/TheLegendOfZelda'':
** The ending of ''VideoGame/TheLegendOfZeldaOcarinaOfTime'' [[http://cdn.gamerant.com/wp-content/uploads/Official-Legend-of-Zelda-Timeline-.jpg created three timelines]] (not, as previously guessed, two): Link is defeated, the timeline when Link is sent back to his childhood and Ganon never takes over, and when Ganon takes over but is then defeated by Link as an adult.
** The Spirit Temple in the ''[[VideoGame/TheLegendOfZeldaOcarinaOfTime OoT]]'' [[UpdatedReRelease Master Quest]] has a switch only accessible in the future that drops a chest only accessible in the past.
** Then there's the Song Of Storms. Link learns to play it on his ocarina from the Windmill Guy, who's ticked because "some Ocarina kid" came 7 years ago and played it, messing up the windmill. Guessed who the Ocarina kid is? And how ''he'' learned the song? That's right, from Windmill Guy, [[StableTimeLoop 7 years in the future]]. Of course, by itself a mere [[TemporalParadox ontological paradox]] isn't enough to claim this trope - it is after all a very common hazard of {{Stable Time Loop}}s - but when you combine it with the timeline split...
** This is repeated in ''VideoGame/TheLegendOfZeldaOracleOfAges'', during a ''ChainOfDeals'' no less. The one link involves getting an antique vase from one Goron in the present, who claims it's a cherished family heirloom passed down through generations. Your next link is to give it to his ancestor 400 years in the past, who promises to cherish it and pass it on to his children. [[MST3KMantra ...Just let that one go]].
** ''VideoGame/TheLegendOfZeldaMajorasMask'' is even worse about this. Link is stuck in a GroundhogDayLoop that lasts for three days. Whenever the loop starts over, his actions in the previous loop are erased. There are no time travel duplicates, which erases the possibility of another Link running around doing things you've previously done. Instead, they simply don't occur unless you go and do them again. Despite this, once you defeat the final boss, all the cycles you've completed are somehow merged together without explanation and everyone is saved, rather than just the people you helped in the final cycle. Even if you speedrun this doesn't make any sense since the game cannot be fully completed in a single cycle (one sidequest in particular has to be done at least twice in two different cycles with slight variations for HundredPercentCompletion). This was probably just done so that the game could have a happy ending, but it seems to break the game's own rules about how TimeTravel works. Maybe [[AWizardDidIt the Goddess of Time did it]].
*** When you travel back in time, Link loses all his consumables (rupees, arrows, potions etc.) but keeps all the gear he has acquired and can even regain certain things if he's lost them (like if Takkuri steals your sword). This doesn't make much sense no matter how you slice it, i.e. if Link is physically traveling back in time then he should take everything with him, but if he's performing some sort of MentalTimeTravel then he should take nothing with him.
** ''[[VideoGame/TheLegendOfZeldaOracleGames Oracle Of Ages]]'' has {{Stable Time Loop}}s ''and'' {{Temporal Paradox}}es, to say nothing of things like the Black Tower, which grows in the present while being built in the past.
--->''In four games, the precise nature of time has never remained constant. ''Ocarina of Time'' contains at least two very different mechanics, which theorists often find irreconcilable (and downright strange). ''Ages'' mechanics only begin to make sense when one sacrifices logic to storyline completely, and ''Majora's Mask's'' Goddess of Time takes the whole thing to hell by drawing questions of omnipotence into the debate.''
--->--'''The Internet''', Trying to solve the mess that is the Zelda Timeline.
*** Even the map is not consistent: most of the time, there is a ripple effect/timeline alteration, but some instances are only plausible with a StableTimeLoop, such as a dungeon that gets opened with a special object in the past and that, in the present, becomes another dungeon, visited ''earlier'' in the game.
** ''VideoGame/TheLegendOfZeldaSkywardSword'' continues the tradition with Timeshift Stones. When hit, they revert the area around them to several hundred years in the past. Oddly, however, any change you make in the present near one of these stones will still be there in the past. And then, near the end of the game, [[spoiler: Link uses the Triforce to kill GreaterScopeVillain Demise in the present. However, Ghirahim kidnaps Zelda and uses her to free Demise several centuries in the past. Link follows him back and seals the past Demise within the Master Sword, which he leaves in the past Sealed Temple. None of this is shown to have had any effect on the timeline when Link, Groose and Zelda return to the present in the ending. The funny thing is this could have worked as a StableTimeLoop had they trapped Demise in the Sealed Temple again instead of in the Master Sword]].
** Even weirder is that the first time you visit the Sealed Temple, you can see [[spoiler: the crystal Zelda eventually seals herself inside]] which is created later in the game, but in the past. [[spoiler: The Master Sword]], however, doesn't appear until the end of the game, even though that also happens in the past. Also, near the end of the game you gain the ability to travel between the past and present at will. You can do this without consequence, even though [[spoiler: Demise has been freed in the past and would presumably have wrecked havoc on Hyrule and Skyloft without Link to stop him. He does say he would give Link time to prepare before their final battle, but you'd think after ''several hundred years'' he'd have gotten tired of waiting]].
** This seems to be par of the course for the series as a whole. Even time travel elements that "work" often contradict those in other games, or even the same game... many of which in turn [[MindScrew contradict each other]]. It seems that the effects of time travel in the Zeldaverse are [[NewRulesAsThePlotDemands pretty much determined by how convenient they are to the plot...]]
* ''VideoGame/MapleStory'' actually uses this term during the Silent Crusade (considering it's unclear how time travel works in-universe or whether it can actually cause changes, makes it fit):
--> ''"I found some other timey-wimey dimensional place! It was neat! Oh, also the Goddess of Time was there!"''
* ''VideoGame/MarioAndLuigiPartnersInTime''. This was {{lampshade|Hanging}}d at one point, where doing something in the past gives E. Gadd an idea in the present, and he notes how paradoxical it is.
* In ''VideoGame/MetalGearSolid3SnakeEater'', set about 40 years before ''VideoGame/MetalGearSolid'', killing Ocelot, EVA or Big Boss creates a TemporalParadox and causes a GameOver. But no paradox is caused by killing Raikov, even though he shows up later in ''VideoGame/MetalGearSolidPortableOps''.
* Time travel is central to the premise of ''VideoGame/MillenniaAlteredDestinies''. The PlayerCharacter is a human recruited by a mysterious alien race known only as the Hoods to alter the history of the Echelon Galaxy to prevent the hostile Microid race from conquering it. With the XTM ship, the player is able to perform space/time jumps around Echelon and make certain changes to ensure the successful rise of four alien races, so they end up resisting the Microids and provide you with the replacement for the parts for the intergalactic drive to return home. The XTM has RippleEffectProofMemory, so the changes don't affect you, except for the historical database specifically designed to avert this (so you can see what's been changed). One of your enemies are the Hoods themselves, who have previously attempted to make changes to the galaxy's past. Your greatest enemy is your EvilCounterpart, an alternate version of you recruited by the Microids to ensure their dominance. Like you, he has his own XTM, is immune to timeline changes, and can travel to any planet in any time period, ruining your hard work. It's the only part of the game that runs on SanDimasTime. Additionally, if you arrive to the time period he screws up, you can chase him off before he can do the damage, but the timeline will not necessarily be restored to what it was (even though it should). Also, the game is not very consistent as to your communications with your agents on the four races' homeworlds. Sometimes, the agent will react to your second call as a follow-up, while other times, he will react as if it's the first time you're calling him in this time period, allowing you to make a different choice from before. The game originally had a NonstandardGameOver happen if you manage to screw up the timeline so much that you can't undo the changes (via an extremely powerful time ripple that destroys your XTM), but then they realized that this can never happen in a game about time travel and removed the option.
* In ''Minty Fresh Adventure'', Colgate can encounter Derpy, who's trying to deliver a letter to her, and the Doctor, who wants Colgate to ''not'' read said letter. The letter is Minuette's application for the position as a dentistry receptionist, from six months into the future, thus suggesting that Colgate will succeed in her quest to become a dentist. There are four endings depending which encounters you do; if you meet both, the Doctor will happily chide Derpy for nearly destroying all space and time just to give Colgate a little motivation.
* There's ''Videogame/NoTimeToExplain'' how time travel works before your future self gets grabbed by a monster and you have to go chasing after them.
* ''VideoGame/{{Okami}}'' manages this. First of all, you travel back in time to defeat [[spoiler: Orochi with the help of Shiranui, your past self at full power, your grandfather, or yourself later in the game depending on your view of the Space Time Continuum. Next, Shiranui comes forward in time to help you beat the first part of the boss fight, only to get mortally injured in the present, then going back in time to die. Then, Chibiterasu, a son of Ammy, goes back in time to help his mom beat Orochi from nine months ago, thawing out his grandfather/mother at full power then going back in time 100 years in the past and... Yeah]].
* The ''Franchise/PrinceOfPersia'' Sands trilogy is one massive example of timey-wimey craziness.
** At the end of ''[[VideoGame/PrinceOfPersiaTheSandsOfTime The Sands of Time]]'', the Prince [[spoiler: entirely reverses the events that just took place, making it so the events of the first game don't happen]]. This seems to have created a paradox by the start of the second game.
** In ''[[VideoGame/PrinceOfPersiaWarriorWithin Warrior Within]]'' the Prince is being chased by the Dahaka in the present, a timeline guardian who is trying to ensure that the timeline proceeds as it was meant to. He is not chased in the past. The Prince inadvertently creates a StableTimeLoop when he [[spoiler: kills Kaileena and creates the Sands of Time, the very thing that he was traveling back in time to prevent]], discovering that he has [[YouAlreadyChangedThePast already changed the past]], just as he was fated to do! At this point, he then is chased in the past as well, as he still needs to be killed for unleashing the sands. Then, he discovers a way to co-exist with himself in the same timeline, which he uses until [[spoiler: his normal self in the past timeline is killed, allowing him to remove the Mask of the Wraith.]] He then returns to the past to attempt to actually change his fate.
** At the end of the second game, in the GoldenEnding, [[spoiler: he has killed the Dahaka and successfully prevented the Sands of Time from ever being created]], causing a true disruption of the timeline.
** In ''[[VideoGame/PrinceOfPersiaTheTwoThrones The Two Thrones]]'', the Prince discovers that his paradoxical actions in Warrior Within mean that the Vizier was never killed and war has been unleashed on his homeland. The Vizier [[spoiler: captures and kills Kaileena, once again unleashing the Sands of Time and effectively repeating the events of the first game in a different setting]]. The Prince eventually [[spoiler: kills the Vizier seals away the Sands again]] and seems to have learned from all his futile time-travel, as he leaves the end of the game be with no further meddling, happy with the one actual change in his life that he actually got to stick, [[spoiler:Farah's survival]].
* ''VideoGame/RadiantHistoria'' is all about using this trope, TrickedOutTime, and most other TimeTravelTropes in a quest to ensure the GoldenEnding. The most confusing aspect is that while there are two separate timelines, making changes in one somehow influences the other, leading to things like helping someone recover from severe depression in one timeline so he won't try to kill you in the other one.
* Episode 204 of ''Franchise/SamAndMax'', "Chariot of the Dogs", focuses on Time Travel. This is Sam and Max; any time travel plot WILL bring in to play every time travel concept as fast as it can for the parody.
** Several stable time loops are created, including one that is required for getting Sam and Max to the time machine in the first place and another that comes into play in episode 205. However, as if completely ignoring the idea of stable time loops, much of the puzzle solving revolves around completely altering the time stream just so that you can fix a problem created by Max's personality the moment you start time travelling.
** One section even has Sam and Max accidentally letting themselves from the first season take their time machine, effectively rewriting everything the player had done in the past year, AFTER a needed macguffin to advance the plot was taken out of the time stream.
* ''VideoGame/SecondSight'' plays with the trope. When John Vattic finds his way to the records room to find Jayne dead, he seems to flash back to the point when she is supposed to have died to save her, eliminating the reason he flashed back at all. This happens a few times in the game, to the point of MindScrew. [[spoiler:However, what's really happening is that the "past" the player is experiencing is, in fact, the present, and the "present" is a premonition caused by the protagonist's latent psychic powers emerging.]] It's pulled off extremely well.
* ''VideoGame/ShadowHearts: Covenant'': A Timey-Wimey Ball in the good ending sends the main character back to the beginning of the first game with the implication that both of the first game's endings are canon. It also [[spoiler: sent Karin back in time to meet Yuri's father and become Yuri's mother]].
* ''Franchise/SonicTheHedgehog'':
** ''VideoGame/SonicTheHedgehog2006''. Shadow's story depends on a YouAlreadyChangedThePast StableTimeLoop (Mephiles breaking out of the Scepter of Darkness in the present is the direct cause of Shadow traveling to the past and [[SealedEvilInACan sealing Mephiles in the first place]]). MeanwhileInTheFuture, Sonic directly contradicts this by traveling from the BadFuture to the present and successfully SetRightWhatOnceWentWrong (by preventing the death that was a direct cause of the Bad Future). And due to his interactions with both Shadow and Sonic, Silver's story uses ''both'' sets of time-travel rules, depending on the scene. Even if there hadn't been a ResetButtonEnding, the {{temporal paradox}}es probably would have caused the whole plot to erase itself anyway.
** Even that's not correct anymore, because ''VideoGame/SonicGenerations'' centers around the Time Eater, a creature that can take places out of time. One of the places he takes, is Crisis City, the BadFuture version of 06's world. Even though, 06 never technically happened and shouldn't feasibly exist for the Time Eater to be able to access the events that happened in it, it somehow does, meaning that '06 does exist, but doesn't exist, simultaneously. Also, you play Crisis City where '''06'' fits in the timeline, not adjusting for the fact that Crisis City technically comes from a future that presumably took place well after the events of ''Unleashed'' and ''Colors''. Fair enough, since Sonic first visited Crisis City in that order, but it still adds another layer of Timey-Wimey to everything.
* ''VideoGame/TacticsOgre'', despite its Chariot and Wheel of Fortune Tarots, averts this entirely. Although [[spoiler: the World Tarot lets you relive the other chapter paths, thus opening up the possibility for a Timey-Wimey Ball, the final events in Coda suggest that this is not time travel, but merely Denam's imagination.]]
* In ''VideoGame/TalesOfMajeyal'' this is how unlocking the [[TimeMaster Chronomancer]] classes works. When exploring the Daikara mountain range you can enter a Temporal Rift optional dungeon, which consists of alternate versions of other areas populated by weird extra-temporal monsters. Defeating the bosses unlocks the Temporal Warden class for future games. When you enter the Daikara when playing as a Temporal Warden you are attacked and killed by your future self. The GrandfatherParadox then kills your future self, un-kills you, creates the Temporal Rift, and unlocks the Paradox Mage class.
* ''VideoGame/TimeHollow'' suffers from this trope at times. At one point, you [[spoiler: rescue a mother and son from dying in a bus crash.]] Immediately afterwards, time refuses to change. So you try again. And again, nothing happens. [[spoiler: Turns out the mother deliberately RE-changed events to cause her and her son's death.]] This is handwaved with an explanation that objects and people pulled or otherwise sent through a time warp become 'detached' in time. It may make your head hurt a bit more when you are able to talk to [[spoiler: the mother, older, in the timeline in which you saved her,]] even though that timeline, from your perspective, DOES NOT EXIST [[spoiler: because she keeps changing the past to prevent it]].
* The ObviousBeta action-adventure game ''The Time Machine'' runs into a more literal version of this. Time is like a flat plane in the setting, and by travelling to the future, Wales causes his time and the future to become tied together by the time machine itself, pulling time together into a whirlpool of sorts that starts destroying time as he knows it. [[MST3KMantra Which makes absolutely no physical sense]], but serves to explain why returning to his previous time(and thus putting himself and the Time Machine back in the time where they belong) prevents any further damage to the time plane.
* ''VideoGame/TimeSplittersFuturePerfect'' relied on {{Stable Time Loop}}s for plot progression; for example, early on in the game Cortez receives a key after holding a conversation with himself through a grate in the ceiling ... then later, holds a conversation with himself through a grate in the floor and drops himself the key. And then in the game's conclusion, [[spoiler:Cortez changes the past, stopping the Time Splitters from ever being created, complete with his Present being changed from a ruined battlefield to a beautiful landscape, with no real effect on him, or anyone else from his time]]. This utter disregard for consistency is all worth it for the scene where Cortez is stuck in a vault with security systems trying to kill him, which the player plays through several times, thanks to the Stable Time Loops, and even gives himself the password, seemingly picking it out of thin air.
* ''VideoGame/UltimaI'' has you stop the evil and immortal wizard Mondain by travelling abck in time and defeating him before he became immortal. Doing so should remove the centuries of tyranny and oppression from history, as well as cause a grandfather paradox (why would you go back to defeat Mondain if he was already defeated long ago?), yet everyone remembers everything.
* ''VideoGame/WorldOfWarcraft'' got a big scoop of this when the Caverns of Time were introduced.
** Ingame, this is the home of the Bronze Dragonflight, Guardians of Time, which need the players' help against the Infinite Dragonflight which are trying to mess up the timeline. But really, it's just an excuse to let players reexperience some of the key moments in Warcraft history, although in a different way (instead of Thrall escaping captivity with the help of a human girl causing distractions, the players need to bail him out by force). If you screw up, the Bronze Dragons just hit the ResetButton until you get it right. [[Series/DoctorWho The Doctor]] may have used the TARDIS for sightseeing, but the Bronze Dragonflight runs a travel agency.
** And in patch 4.3, players get to travel back again, via the Caverns of Time, to the events in the ''War of the Ancients'', to retrieve a [[MacGuffin magical artifact]]. However, the events of another novel are centered around said artifact, meaning they logically would be {{Ret Con}}ned. Given that the events of that novel are what indirectly led to the rise of Deathwing, who is the main reason for recovering the artifact in the first place ... confusing doesn't even begin to describe it.
** The existence of Murozond is one big example. At some unspecified point in the future, Nozdormu, Dragon Aspect of Time, will go insane and become Murozond, who creates the Infinite Dragonflight and wrecks havoc on the timeline with the goal of bringing about a BadFuture. ''Nozdormu himself is aware of this.'' He is also aware that this will lead to his death and that Murozond will ultimately fail to change anything, having both been granted a vision of his death by the Titans and personally witnessing it happen to his future self in the End Time. Murozond's dialogue in End Time implies he is indeed the same Nozdormu we interact with in the present day, and not an AlternateTimeline version of him, as he berates his younger self for "not know[ing]" his reasoning back then. Yet somehow, he still seems certain enough he will succeed to try and change the timeline anyway. But then Nozdormu loses his Aspect Powers in the Dragon Soul raid, which takes place after we're sent to the End Time but before Nozdormu becomes Murozond. Murozond does not seem to be weakened by this in End Time. Despite all this, Nozdormu is certain he will eventually become Murozond and there is nothing that can be done to stop it... Even though all he'd need to do to prevent it is not attempt to change something he already knows he'll fail to change if he tries.
*** Murozond was taken down by a 5-man group with some assistance from his past self. Malygos and Deathwing, meanwhile, required 25-man raid groups plus extensive backup. It's safe to say that Murozond ''was'' weakened by the whole depowering thing. Additionally, Nozdormu was told by the Titans that he must ''not'' change the circumstances of his death under any circumstances, so simply not doing anything that could turn him into Murozond is unacceptable.
** Warlords of Draenor, the expansion pack announced at BlizzCon 2013, takes place in a Draenor heavily affected by the Timey-Wimey Ball. Garrosh escapes from prison, flees into the past of Draenor, stops the Orcs from drinking Mannoroth's blood, and introduces modern technology, creating a new "Iron Horde", changing the destiny of every major player on Draenor (and even the world itself). The only change to modern Azeroth, however, is that the Dark Portal changes from Green to Red, linking to the new Draenor, not Outland. How Azeroth is completely unaffected is thus far, unexplained (though one can assume Twisting Nether Timey-Wimey stuff.)
*** WordOfGod is that Garrosh traveled to a different timeline altogether.
* ''VideoGame/LifeIsStrange'' is pretty good about their internal rules. Max can rewind a short time (At most a few minutes) while she remembers what happened before, this is the 'first' time for everyone else. (this allows her to use 'future' conversations in the 'present.' This is also how she can change decisions in one area, but as soon as she leaves, she can't. It's too far to rewind.) However once you move beyond those rules, it starts getting confusing. [[spoiler: Starting with how she freezes time once without explanation and never done again. Time Travel through photographs is completely unexplained. As is the fact that she is 'replacing' her double from that timeline. ([[RippleEffectProofMemory though she keeps the memories of 'her' timeline]]) and she somehow had a vision of the tornado at the end of the game before she got her powers. And one of the two endings heavily implies she wasn't supposed to have the powers in the first place. In fact, several characters theorize that her powers CAUSED the tornado. Despite how she saw the Tornado BEFORE she got the powers, and her powers activated by accident trying to save someone's life. The ending is divisive.]]
* In ''Videogame/{{Destiny}}'', time travel ''happens'' but the exact nature of it is... iffy. The [[DeusEstMachina Vex superintelligence]] seems to greatly enjoy the benefits of time travel, being able to casually traverse various timelines, pulling units, materials, and even energy from different points in spacetime, to the point that their basic weapons yank points of energy from other random parts of time and space. They even have the ability to retroactively control spacetime and decide if something exists.... or if it [[RetGone ever existed in the first place]] in certain locations. Other pieces of Vex technology include machines that allow users to actually travel through time, seeing the future or viewing alternate timelines. On the other hand, [[BigGood the Traveler]] and [[PlayerCharacter the Guardians]] seem to be distinct in their ability to [[NoSell ignore]] changes in timelines and reality-alteration, to the point that the Guardians are able to outright [[ScrewDestiny deny temporal changes within the Vex Vault of Glass using their Light]].
* God help anyone trying to understand the way time travel works in ''VideoGame/The3rdBirthday'' - though it's likely that most of the problems were caused by the game's TroubledProduction and [[ObviousBeta far from final script draft]]. Sometimes, changing the past causes complicated butterfly effects that leave to other characters being alive. Other times, it causes people to become paradoxed out of existence, ''Film/BackToTheFuture''-style. Other times it causes people to become temporal ghosts unable to interact with normal events. Whether other characters can remember previous timelines seems essentially random.

[[folder:Web Animation]]
* ''Machinima/RedVsBlue'' starts out with a StableTimeLoop when Church keeps going back in time and ends up causing almost every problem that happened to the Blue Team. Then in season five, Wyoming uses his time travel ability [[spoiler:(which Church was originally using without knowing it)]] to try and win the battle. Tucker has RippleEffectProofMemory thanks to his sword and they end up doing things, and then undoing them. For example, [[spoiler:Caboose is killed by the tank, and Tex gets knocked out/killed by Wyoming. In the "final draft" of the timeline, Tucker yells at Caboose to stay away, and warns Tex that Wyoming knows that she's there]]. Then it turns back into StableTimeLoop when Caboose's mental image of Sister, who is a guy, gets pulled into the real world. S/he ends up materializing next to a dead Wyoming, whose suit malfunctions, sending him all the way back to Sidewinder. Turns out, ''he'' was the mysterious "Yellow Church" that fans speculated about for years.
** Since the "Yellow Church" claimed his plan to solve the Sidewinder crisis "seemed like such a good idea at the time", it could be safe to speculate Sister/Yellow Church is there due to a further loop leading back to Sidewinder.
** The series later attempts to explain all this earlier time-travel nonsense during the "Recollections" trilogy of seasons by [[spoiler: explaining that the Red and Blue soldiers are actually simulation troopers meant to test Freelancer troops against a myriad of mad situations and everything they were subjected to in Blood Gulch was in fact a controlled situation they weren't meant to understand]].
** Actually Word of God from Burnie Burns has confirmed that [[spoiler: Church going back in time repeatedly never really happened, and was merely Gamma and Omega trying to cause Alpha to fracture into more A.I. fragments. Nobody moved through time in season 3. Yes this is a major retcon, but as of Season 8 it is considered the canonical explanation]].

[[folder:Web Comics]]
* Used to great effect in ''Webcomic/The10Doctors''. It's even mentioned by name as to how all ten Doctors can be in one place at the same time.
-->'''Third Doctor:''' You see... time is... well... it's...\\
'''Second Doctor:''' Well, it's... It's not linear... It is more sort of...\\
'''Tenth Doctor:''' It's... squishy-squashy...\\
'''Seventh Doctor:''' Wibbly wobbly.\\
'''Sixth Doctor:''' Semi-fluid!\\
'''Fifth Doctor:''' Gelatinous.\\
'''Ninth Doctor:''' Mushy-gooey.\\
'''Drax:''' Higgledy piggledy.\\
'''Fourth Doctor:''' Hi-ho the dairy-o!\\
'''Romana II:''' Green grow the rushes-o!\\
'''First Doctor:''' Alright, you lot!
* In ''Webcomic/BobAndGeorge'' most of the characters can never find out what kind of rule Time Travel goes by, and one person once said it can be changed ''by the setting on the time machine''. However, it appears that they follow StableTimeLoop rules, as no time period is ever affected by what happens in another. Indeed, the only way time travel is different than going to a different dimension is that people ''think'' it may change history.
** Dr. Light's lab is clearly shown being pre-destroyed by a time ripple tearing through it and enforcing events from the new past. So yes, the past can be changed if you use the time machine right.
** [[spoiler:The ending however, suggest a stable time-loop, as it ends with a suggestion from a time-travelling ghost of Zero telling Wily to not activate him so he won't kill everyone. Then they all fake their death and move to Acapulco to prevent a temporal paradox.]]
** There is a very good reason why "I hate Time Travel," is one of the more common {{Catch Phrase}}s of the comic.
** At another point, Protoman adds a fresh level of murk due to a) lacking RippleEffectProofMemory and b) being paranoid enough to ''know'' he lacks RippleEffectProofMemory, by remarking that a time-travel story is exactly how he remembered the events in question...well, it's how he remembers it ''now''.
* ''Webcomic/BreakpointCity'' can't decide quite how time travel works.
* ''Webcomic/DresdenCodak'': Dresden fucking Codak. This is what happens when DadaComics undergo CerebusSyndrome; [[MindScrew leave your sanity at the door]]. The basic mechanics of the wimey-ball are pretty clearly laid out [[http://dresdencodak.com/2007/09/04/an-exotic-matter/ at the bottom of this page,]] though as always some inconsistencies appear if you think about it too much (somehow, the artificial wormhole doesn't split the timeline, but the natural one does).
* ''Webcomic/{{Earthsong}}'' has a bit of timey-wimey-ball action, since character are pulled together to one time, and then returned back to the moment they left after an indeterminate amount of time.
* Discussed in ''Webcomic/ElGoonishShive'': Grace [[http://www.egscomics.com/egsnp.php?id=254 expresses confusion]] about how in ''Film/BackToTheFuture'' Marty is affected by the DelayedRippleEffect and while at the same time possessing RippleEffectProofMemory. Justin tells her that the sequels don't make sense of this inconsistency and further that time travel is not allowed to make sense.
* The sequel fic ''[[Webcomic/RichsComixBlog Forever Janette]]'' intentionally invokes the Timey-Wimey Ball by subverting the show's use of SanDimasTime -- by letting the Fifth Doctor meet the Master from the Seventh Doctor's time. It doesn't say how this is possible, other than a passing mention that the two Time Lords are "off-phase" from a common Gallifreyan synchronicity.
* Time travel in ''Webcomic/IrregularWebcomic'' at first ''appears'' to work in a StableTimeLoop fashion, but then it's revealed that [[spoiler: It's possible to "break" a StableTimeLoop, an action capable of ''destroying the entire universe.'' [[OhCrap Several time loops have already been broken]]]]. And now [[spoiler: Every universe, save the "espionage" theme universe, has been destroyed. They got better]]. [[RunningGag And now]] apparently the timeline is too broken to go back pre-1933 (specifically the date of the Reichstag Fire). Complete with a link to this very article.
* ''Webcomic/LookingForGroup'' has a big fat temporal loop in the Kethenecia arc in Book 3, but really the arc underlies the whole story so far. It's still uncertain if the protagonists can actually change the timeline should they chose to, since so far they did their best to fulfill the prophecies.
* Trying to track the [[RetGone timeline changes]] in ''Webcomic/{{Misfile}}'' may lead to you repeating this trope name [[MadnessMantra over and over and over again]].
* ''Webcomic/MinionsAtWork:'' [[http://www.theminionsatwork.com/comic/a-paradox-is-not-a-pair-remastered-sorta/ Pretend it never happened]].
* ''Webcomic/{{Narbonic}}''
** The webcomic features an extended time-travel subplot which establishes that it is difficult, but not impossible, to change your own history. Physical time-travel takes all the energy that exists in the Universe [[spoiler: or, as it turns out, in some other universe that's just out of luck]], but it's possible to transfer your consciousness back or forward in time into your own body, and you can undergo changes as a result of altered behavior. For instance, Dave never smoked. At several points, the question of paradoxes comes up, and it is immediately dismissed by pointing out that thinking about it could cause it to happen, so it's better not to.
** The same storyline provides an example of inconsistent time travel effects within a single sub-plot. Dave didn't cease to have ever smoked until after the time travel; however, [[spoiler:Caliban's demotion]], though also caused by the time travel, was established backstory before the time travel occurred.
* [[http://www.mspaintadventures.com/?s=6&p=003151 This page]] of the Midnight Crew intermission in ''Webcomic/{{Homestuck}}'' typifies the response. Though most of the time travel shenanigans seem ''fairly'' self-consistent, it's still hella complex.
** In the main continuity of the series, it gets worse when [[spoiler: Future!Dave]] starts incorporating TimeTravel shenanigans. And even ''[[TimeMaster he]]'' doesn't understand all the mechanisms behind it, his advice to the other characters (and the audience) is just basically [[BellisariosMaxim "Don't overthink it."]]
--->'''Dave:''' see the thing with time travel is\\
'''Dave:''' you cant overthink it\\
'''Dave:''' you just got to roll with it and see what happens\\
'''Dave:''' and above all try not to do anything retarded\\
'''[[http://www.mspaintadventures.com/?s=6&p=003504 John:]]''' i'm just the timey-wimey messenger here.
** However, MagicAIsMagicA applies heavily and every form of time travel is internally consistent. The problem arises when there are at least ''four'' different forms of time travel, and possibly even more, all of which abide different rules
*** Heroes of Time have two options. Either A) They change destiny and cause a branch timeline, or B) YouAlreadyChangedThePast. They naturally have some intuition about what changes cause what. Time magic practiced by the Felt is more loose, and can be used for pretty much any form of TimeTravel. And then there's the weird stuff, like the Furthest Ring distorting space and time, potentially causing someone to meet their past selves by traveling in a straight line and Skaian portals.
** The Doctor's [[Recap/DoctorWhoS29E10Blink Trope-Naming]] soundbite is used in [[http://homestuck.bandcamp.com/track/arisen-anew Arisen Anew]] from the Alternia Bound album.
** All the rules get thrown out the window when John touches a strange artifact that makes him unstuck from reality. He has the power to make [[OrwellianRetcon real and permanent changes in the alpha timeline]].
* ''WebComic/ManlyGuysDoingManlyThings'' heavily lampshades this trope. The main requirement to avoid the variety of paradoxes is "Don't think about time travel".
--> '''[[TheWatson Jones]]''' : Nnnnnooo [[http://thepunchlineismachismo.com/archives/comic/i-have-no-idea-how-long-this-arc-will-last I still think that's not how time travel works]]...\\
'''[[AwesomeMcCoolname Commander Badass]]''' : Look, anyone who watches as much Doctor Who as you do gotta know that technology more 're less runs on bullshit.
* The characters of ''Webcomic/{{Melonpool}}'' handled time travel pretty responsibly the first two times. After they disable a mechanism that forbade them from being able to interact with things they had already done, including their past selves who ''were the time travelers'', the whole affair became a convoluted mess and every new revelation had to be resolved by [[DepartmentOfRedundancyDepartment going back in time to stop themselves from changing what happened by going back in time to stop themselves from changing what happened]]. The moral of the story is: don't mess with time travel or your [[TimeCrash universe will implode]].
* This is probably gonna be the only way to understand the whole time traveling bit in ''Webcomic/{{Sonichu}}''. To wit, AuthorAvatar Chris is launched into the future where he is able to help those in the future [[CureYourGays make the vaccine for homosexuality]] (even if that's not how it works) before being able to convince his future wife Lovely Weather he is his future self (despite the fact that he'd be ten or so years older) and do the nasty. He comes back, gives Magi-Chan Sonichu a Sonichu Ball and tells him to go back and get some of the vaccine to bring back to the past so they can cure everyone years earlier. And while he does talk to the past version of Lovely Weather, there's the case of the vaccine - if he brought the vaccine back from the past to cure everyone, why would there be a need for it in the future and oh, going cross-eyed.
* There don't seem to be any concrete rules to ''Webcomic/SluggyFreelance'' TimeTravel. Possibly [[JustifiedTrope justified]] by the presence of beings like Father Time, Uncle Time, and the Fate Spiders who have an interest in making sure time runs smoothly and/or in a [[RuleOfFun fun]] way.
** The fact that the original fate spider gives up, quits his job and then only comes back after his successor has screwed everything up even more says a lot, at this point they seem to pretty much just watch and be amazed that all of creation hasn't gone up in flames already.
** In a later strip, Old-Riff says that TimeTravel follows the branching timeline rules, and therefore you can't change the past, you're just abandoning the BadFuture in favor of a different universe. But really, the way it works, this revelation doesn't actually contradict anything, since from the characters' perspective, they would have no way of knowing.
* ''Webcomic/TheStarshipDestiny'':
** The robot Gizmo goes back in time to kill Hitler, reasoning that he can then go back again and stop himself. Instead, his first iteration convinces him to join in, since he can just go back again, and stop himself. Predictably, they end up having ''dozens'' of Gizmos brutalizing Hitler before he's had enough and stops his first self... and gives him a video recording of the event.
** In another chapter, Gizmo went insane from a virus while saving the ship. The other crew members fix this by taking his head off (it contains his processors and memory drives), going back in time to just before he went insane, and switching heads, thus bringing his sane head back to the present while the insane one faces the virus (presumably, he can't go even insaner).
* Done [[SoBadItsGood hilariously badly]] in the abandoned indie RPG ''Webcomic/ZybourneClock'':
--> [[MemeticMutation Imagine four balls on the edge of a cliff.]] Say a direct copy of the ball nearest the cliff is sent to the back of the line of balls and takes the place of the first ball. The formerly first ball becomes the second, the second becomes the third, and the fourth falls off the cliff. Time works the same way.
* ''Webcomic/AwfulHospital'': The alien zones don't always use "time" as we humans understand it, but something called "layers." Chronology can sometimes jump around on its own, via layers, without Fern needing to enter a time machine:
--> '''Staph''': As you read this letter, our kingdom will have undergone many generations of development... at least from our perception. Don't fret! In your own perception sphere, we are very much alive, and I'm certain you will have an opportunity to drop in and say 'hello.' Does that make sense? Sorry, we still don't really have a handle on how you experience the layers.

[[folder:Web Original]]
* The ''Franchise/{{Terminator}}'' variety is spoofed in the ''WebVideo/AtopTheFourthWall'', where time travel doesn't work on pants.
* ''WebVideo/MindMyGap'' is a plot made of this. It seem at one point that up to four chronologically separate events with the same characters involved are happening at exactly the same time
* ''Literature/{{Phaeton}}'' has time travel mechanics, but also has laws, and etiquette, all to prevent this from happening. Still there are people who don't follow the "Six Minute Flux" mechanic and cause this.
* According to Huey in ''WebAnimation/{{Ducktalez}} 5'', the time-travelling Deweys all come from alternate timelines that are created when one of them tries to change history. Huey offers a situation, but that fails. Also, Dewey tries to ask for the Doctor's help, but that fails.
* ''AudioPlay/DoctorWhoovesAdventures'', being a ''Series/DoctorWho'' fanfiction, have a tendency. ''[[BadFuture Traveler]]'' in particular.

[[folder:Western Animation]]
* In the ''WesternAnimation/AdventuresOfSonicTheHedgehog'' multi-parter Scratch and Grounder made it so a couple of Sonic's ancestors didn't meet, making Sonic disappear. But for some reason Tails is still there and able to fix this.
* In the double-episode "Two Futures" of ''WesternAnimation/CaptainPlanetAndThePlaneteers'', Wheeler uses a time pool to go back and prevent himself from receiving the fire ring. This results in a [[CrapsackWorld crapsack future]] because the Planeteers never became a team and saved the environment (though why they [[FridgeLogic didn't just find another guy to accept it]] is never explained). He then goes back and prevents himself from preventing himself from getting the ring. Then they both escape into the time pool again and merge for some reason. To make sure the viewers knew things were restored to normal, a scene from the utopian future is shown at the very end.
* Time travel in ''WesternAnimation/TheFairlyOddParents'' is... confusing. The first time TimeTravel is used as a plot device, and in most subsequent appearances, history is very malleable and can easily be changed... with serious consequences.
** However, the episode "The Secret Origin of Denzel Crocker" appears to utilize a straight StableTimeLoop... however [[spoiler: Timmy's time traveling, in addition to causing Crocker to lose his fairies as a kid, also gave him a much more sophisticated fairy-tracker which he didn't originally have as an adult]], meaning that [[spoiler: Crocker must have lost his fairies]] a slightly different way the "first time around".
** In a much later episode when Timmy wishes he were never born, ''a la'' ''Film/ItsAWonderfulLife'', Jorgen reveals that Crocker's childhood would never have been ruined had Timmy never existed, which means that there ''was'' no "first time around" [[note]]if there were, one would expect that Timmy negating his own existence would have undone all his changes to the past and history would be restored to the way it originally proceeded, sans Timmy of course[[/note]]. In other words, the writers wanted to use both {{Stable Time Loop}}s and {{Temporal Paradox}}es at the same time, resulting in a confusing mess. Cosmo did a lot to get little Crocker obsessed with fairies, but he only got the opportunity due to Timmy.
* ''WesternAnimation/{{Futurama}}'':
** Time travel results in the creation of {{Stable Time Loop}}s... except when it doesn't. In "[[Recap/FuturamaS3E19RoswellThatEndsWell Roswell That Ends Well]]", YouAlreadyChangedThePast is in effect, and everything makes sense. Then "[[Recap/FuturamaS4E10TheWhyOfFry The Why of Fry]]" contradicts this, and Fry succeeds in altering his own past (he doesn't prevent himself from getting cryogenically frozen, as he originally intended, but he does convince the Nibblonians to give him a better getaway scooter). Then, ''Bender's Big Score'' throws sense out the window: Bender's rampant time travel is revealed as the cause of [[ContinuityNod some events from previous episodes]] (such as the fossilization of Seymour, and the first destruction of Old New York by flying saucers), while completely altering some other events (the [[DownerEnding final scene of "Jurassic Bark"]] gets retconned). Both stable time loops (like the tattoo on Fry's butt) and utter nonsense (like Hermes Conrad stealing his own body from the past) work equally well. Rather appropriately, Bender's time travel is carried out by a ''literal'' Timey-Wimey Ball.
** Then there's Professor Farnsworth's time machine in "[[Recap/FuturamaS6E7TheLatePhillipJFry The Late Philip J. Fry]]", which could only go forward in time. When Farnsworth, Fry and Bender returned to a new, identical universe (making the Big Bounce theory true) It's impossible to know if the killing of the fish or Hitler did anything to Universe Two because they didn't get to stop in the 31st century to find out. They had to go around again to finally make a stop at Universe 3. This leads to all sorts of crazy implications as to what happened to the time traveling crew in the 2nd universe...do they kill their Universe 4 selves?
** On the [=DVD=] commentary for "Roswell," the writers say that they initially intended to avoid doing any time travel stories, because it's basically impossible to make them make sense, but eventually they couldn't resist.
* ''WesternAnimation/ThePenguinsOfMadagascar'' has Kowalski try to stop two paradoxes that he created at the same time. While it's eventually resolved with a stable time loop, the second/third Kowalski couldn't have existed without having it's own paradox. It's... confusing. And the paradoxes effect time is only a few hours.
* The plot of a ''WesternAnimation/PinkyAndTheBrain'' episode, in which the mice try to obtain a "World Domination Kit" from the future. It doesn't even ''try'' to make sense, but suffice to say it ended with the lab full of hundreds of Pinkys and Brains, and the ending tune changed to "They're Pinkys, they're Pinkys and the Brain Brain Brain Brain Brain Brain Brain [[OverlyLongGag Brain Brain Brain]]."
* ''WesternAnimation/RandyCunninghamNinthGradeNinja'': When the past was altered so the Sorcerer's imprisonment never happened, it got the Sorcerer free but didn't change the world in any way that reflected the damages he would have caused during eight centuries of altered history. No explanations were given.
* One of the first episodes of ''WesternAnimation/{{Sealab 2021}}'' shows Stormy and Quinn trying to steal cable for Captain Murphy and inadvertently cause a rift that sends them back in time to just before they left Sealab (about 15 minutes). They try to prevent themselves from causing the rift, but past Captain Murphy is convinced they are evil dopplegangers not time travelers, so he has them locked in the brig. When their past-selves cause the rift (again), they experience the same events but somehow the original pair is ''also'' in the brig when they get there. So now there's 3 Stormys and 3 Quinns running around. Since the time difference is only 15 minutes, each successive Stormy and Quinn react in the same way, and since each pair is unable to stop the next pair, the number of Stormies and Quinns keeps growing until the brig is filled with them and they have to start referring to each other by which iteration of the loop they came from (i.e. Quinn 1, Quin 2, "the 7s", etc). Eventually time itself is getting so screwed up that weird alternate versions of them start showing up too (like Quin as [[Franchise/StarWars Jabba and Stormy as his pet]]). The Quinns band together to try and think of a solution, while the Stormys play dodgeball. Ultimately, one of the Stormys reveals that they've been using their communicator watch(es) the whole time (but only with already locked up Stormys). One of the Quinns borrows it to call the version who is out stealing cable and ''finally'' ends the loop by averting the next explosion. Then, [[StatusQuoIsGod instead of using the combined brain power of dozens of genius Quinns to solve major world problems]], Captain Murphy has all the duplicates [[GladiatorGames fight to death in the gym for his amusement.]]
* ''WesternAnimation/SonicSatam'' screws up it's time travel rules quite confusingly. Sonic and Sally try to travel back in time to before Robotnik's coup in order to stop him, but soon discover that this is impossible and they can't change the past, merely [[StableTimeLoop act out or ensure predetermined events]] (Sonic causes Robotnik's arm to be robotized, saves his younger self from getting captured, etc.). However at the last moment Sally attempts to change the fate of her nanny by telling her future information and it works, even though it logically shouldn't have. Even more confusingly, RippleEffectProofMemory is in effect, so Sonic and Sally don't remember interacting with someone they now logically should. [[LampshadeHanging Sonic is appropriately confused]].
* ''WesternAnimation/SouthPark''
** In one episode, Cartman freezes himself and is thawed out 500 years in the future. He then makes repeated calls to Kyle via a phone that reaches back through time, which makes changes to his time. He and everyone else 500 years from now only know the world the way it is after the changes. However, when he makes one more change at the end that ''hugely'' impacts history, he only remembers what the world was like ''before'' the change, while from everyone else's point of view it's always been that way.
** In the episode "Goobacks" immigrants from the future come back through a time portal to get jobs in the present. When the townspeople try to improve the future so the immigrants will stay in their time period, the immigrants begin to fade away. A reporter notes that scientists say the time border follows ''Franchise/{{Terminator}}'' rules meaning it's one way only and you can't go back as opposed to ''Franchise/BackToTheFuture'' rules, where back and forth is possible, and ''Film/{{Timerider|TheAdventureOfLyleSwann}}'' rules, which are just plain silly.
* [[http://www.colbertnation.com/the-colbert-report-videos/81893/february-07-2007/tek-jansen---from-the-future This]] episode of ''Tek Jansen'', a series of shorts originally created for Creator/StephenColbert's show, illustrates how bad (or ''[[SoBadItsGood awesome]]'') this trope can get.
** A short summary for all the non-Americans who can't see the video: [[spoiler:The Prince and his three attendants, one of whom is named Schlorb, crash land on a planet. Tek Jansen arrives (and to clarify arrives means appear out of nowhere with a time machine) from the future to protect them. Then a second Tek Jansen arrives from further in the future and shoots the first Tek Jansen. Tek explains that in five minutes the first Tek would have eaten a couple of berserker berries, gone insane, and attacked them. He then eats the berries and goes insane. A third Tek Jansen arrives from sometime and shoots the second Tek. He says that Schlorb explained everything to him, but does not remember when. A fourth Tek arrives from the future and sends the third Tek into the past because Schlorb has an important message for him. A fifth Tek accidentally arrives naked with some lady on top of a console. The fourth Tek leaves (and to clarify leaves means disappear with the time machine) with them. A sixth Tek walks on screen with two clean shirts and does not recognize the Prince or his attendants. A seventh Tek arrives and shoots the sixth Tek because one of the shirts had too much starch in it. The seventh Tek is then eaten by a slime monster. An eighth Tek arrives in some sort of armor and asks if he was eaten by the slime monster yet. The kids say yes and Tek leaves frustrated. [[OverlyLongGag A ninth Tek arrives and says that he is pretty sure that he needs to take Schlorb into the past, and proceeds to do so. A battered tenth Tek arrives and warns the kids to stay out of caves, then leaves. An eleventh Tek arrives and says he knows of a great cave that they can camp out in. A twelfth Tek arrives, shoot the eleventh Tek, hands the group an egg beater, tells them to hand it to the next Tek that appears, and leaves. The Prince points out that this is pretty fucked up. A thirteenth Tek arrives fighting a giant egg. Tek grabs the egg beater and leaves, still fighting the egg. A fourteenth Tek arrives and explains that all this time travel has opened a chrono-rift in the space-time continuum. He is going to go fix it, but he wants the kids to do exactly what the next Tek tells them to. He leaves. But then a large group of Teks arrive all pointing in different direction. They proceed to fight each other, and the episode ends on a cliffhanger]]. This all happens in two minutes]]. You got all that?
* ''WesternAnimation/TransformersArmada'':
** After [[spoiler: Thrust shoots Starscream with the [[{{BFG}} Requiem Blaster]],]] we see a shot of Rad as an eight year old waking up in his parents' car and asking tiredly where the Mini-Cons are (implying his "present" mind was momentarily in his past body). Then cut to all the kids - possibly in an alternate future - being told by a slowly dying Hot Shot that the Transformers have all been eaten by Unicron because they didn't know that [[spoiler: the Mini-Cons were servants of Unicron]] and were led to their doom. After this, cut to the kids now being at the moment of the Mini-Cons' creation millions of years ago [[spoiler: inside Unicron. Rad then touches High Wire's hand and frees him (and by association all the other Mini-Cons) from Unicron's control by reminding them of their past[=/=]future happiness together.]] The Mini-Cons then know to go to Earth after they leave Cybertron to meet Rad and the other humans. Cut back to the humans returning mere moments before [[spoiler: Thrust shoots Starscream, whereupon High Wire and his teammates [[CombiningMecha combine into Perceptor]] and knocks the gun away, causing Thrust to miss Starscream completely]]. And none of this is EVER EXPLAINED.
** The Mini-cons who prevented [[spoiler: Starscream from being blasted]] ''weren't'' taken along with the kids' inexplicable time-jump, and there is no reason for them to have done anything differently in the present. It can't even be due to the kids' actions in the past -- the Mini-cons would ''never have gone to Earth to kick off the events of the series'' if not for the kids, so it's not a case of the "old" High Wire [[spoiler: wanting Starscream to die but the "new" one saving him]].
* There's a gigantic lampshade in ''WesternAnimation/TrippingTheRift''. The crew saves the day by turning back time Superham-style: by flying the ship around a star counterclockwise really fast. While they're setting up, they discuss the inconsistency of the rules of time travel and the problems with changing the past.
* In ''WesternAnimation/XMen'', Bishop [[RippleEffectProofMemory keeps his memories of the previous chain of events when he returns into the future]]. Later the two parter "One Man's Worth" has the death of Charles Xavier before he founded X-Men resulting into a war-torn present. Wolverine and Storm from this changed reality travel into the past to help to save him. After the successful mission accomplishment they return into the future (present time) and for some reason lose all their memories about the Xavier-less reality.
* ''WesternAnimation/StaticShock'' has a one-shot time-traveling metahuman who briefly teams up with Static and Gear, only to decide her powers are too dangerous, go back in time to before the Big Bang, and steal her past self's bicycle so she couldn't get caught up in it. Would be a classic paradox were it not for the fact that Static and Gear ''still remember the previous version of what happened''. [[LampshadeHanging Upon pointing this out, Gear comments that if you try too hard to figure it out, your head will explode.]]