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{{trope}}
[[File:
{{quote|''"History abhors a paradox."''
A contradiction of causality within the timeline brought about by [[Time Travel]]. Theorized to be [[Time Crash|dangerous to the fabric of reality]], and known to be [[Your Head Asplode|dangerous to the brains]] of anyone who tries to get their head around them. [[
▲{{quote|''"History abhors a paradox."''|'''''[[Legacy of Kain|Legacy Of Kain: Soul Reaver]]'''''}}
Punishments for violating this rule may vary. You might instantly [[Ret
▲A contradiction of causality within the timeline brought about by [[Time Travel]]. Theorized to be [[Time Crash|dangerous to the fabric of reality]], and known to be [[Your Head Asplode|dangerous to the brains]] of anyone who tries to get their head around them. [[Bellisarios Maxim|So don't]]. It's usually what [[The Professor]] worries about during a [[Time Travel]] story.
▲Punishments for violating this rule may vary. You might instantly [[Ret Gone|vanish from history]] or cause your time-travelling self to be [[Puff of Logic|erased]]; you might be immune but find the world around you different; you might [[Divide By Zero|destroy reality itself]]; heck, you might even [[Butterfly of Doom|accidentally unleash]] [[Clock Roaches|killer flying time monkeys]].
This is all fictional, of course. In reality, a confirmed paradox would disallow time travel to work ''at all''. You see, a logical paradox is not a ''thing''. It is a sign in a human-created model that either you have attempted something impossible or that you have incomplete understanding of how something works. Here's the thing: all our notions of causality are based on the fact that time only moves in the one direction and a paradox exploits this cause and effect relationship. Once you throw [[Time Travel]] into the equation and have time to move in a different way, it's really anyone's guess what will happen. Not that this prevents authors from abusing the concept as a sort of universe-wide [[Logic Bomb]].
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'''Ontological Paradox'''
The kind of paradox that occurs in a [[Stable Time Loop]] if you're not ''very careful'' about what you're doing, involving events that are their own causes. While not a paradox in the strictest sense - events remain self-consistent - it does violate normal expectations in surprising ways.<ref>Quantum physics comes into play, see discussion</ref>
* '''The Object Loop:''' When an object from the future is sent into the past, takes [[The Slow Path]] back to the future, and then gets sent back into the past again, in the same way, for the same purpose. For example you travel to the past and sell a pair of [[Star Trek IV:
** You might ask how the object escapes erosion or other damage too? Since its origin point is also its end point the object cannot (relative to itself) loop endlessly as it would experience infinite decay (relative to itself) and thus would not exist to be sent to the past. Preventing the loop in the first place. Thus to exist the object must (improbably) escape all forms of damage/erosion/entropy between its arrival and departure. Which is technically not impossible but only deepens the weirdness of such an object existing.
*** In one variation, information rather than a physical object comes out of nowhere (e.g. an engineer from the future giving [[Star Trek IV:
* '''The Reverse Grandfather Paradox:''' When time travel is involved, cause and effect tend to get muddled. Say you remember being involved in an accident as a child, and would have died if not for the intervention of a mysterious stranger who showed up, saved your life and then vanished without a trace. Then you become a time traveler and find yourself at the scene of the accident, and there's a little kid who needs saving. That's right: ''you'' happen to be the mysterious rescuer. Instead of accidentally making your time travel unnecessary or impossible by meddling with the past, your meddling somehow made it possible ''in the first place''. But then the question becomes how you "originally" (technically meaningless in this context) survived to time-travel and save
Normally, as written, the temporal paradox never turns out to be as dangerous as [[The Professor]] imagined it would be, or it turns out the characters were [[Stable Time Loop|"supposed to do it"]] [[You Already Changed the Past|in the original timeline]]. The latter ontological paradox is also known as a predestination paradox, and the resultant philosophical questions are rarely thought about in the series.
If two time periods are featured, the effects of a paradox will usually be visible in the future only "after" the cause has happened in the past (see [[Meanwhile in
Interestingly, series rarely [[Timey
The most common effect of a paradox, on TV at least, is to trigger the [[Reset Button]] and unmake the entire episode's consequences.
Theoretically, a paradox that consists of two mutually-exclusive events can have one of two results: either the fabric of reality rips itself apart trying to determine which reality is the 'correct' one,
(Of course, Multiverse Theory also holds that time-travel is ''hypothetically''
Compare [[Timey
----
== Grandfather paradox examples ==
=== Anime and Manga ===
* Toriyama follows the multiverse approach in ''[[Dragonball Z]]'': Future Trunks travels back in time to change the past, although he knows that this will not affect his own past or future (since each timeline exists as a separate dimension, changes made in one time line will not affect the others). Because Cell was also traveling around, but then Trunks prevents Cell's trip, fans have theorized that there are at least five time lines: the time line chronicled by the anime and manga (Line 1), the time line Trunks-who-participates-in-the-Cell-Games (this is Future Trunks, mentioned above) originates from (Line 2), and the time line Cell-who-killed-Trunks-to-steal-the-time-machine-and-terrorized-the-main-series-time-line originates from (Line 3), plus two theoretical/implied time lines. The first implied time line is the one visited by the Trunks native to Line 3, the Trunks killed by Cell so that he could go back to Line 1. This time line would proceed identically as Line 1 up to the point of Cell's discovery; after that, all fans have been able to guess is that the androids were somehow defeated. The commonly-accepted (suggested by the Daizenshuu guidebooks) theory is that Bulma built the deactivation switch (just like she did in Line 1) but Kuririn didn't destroy it, and Trunks took it back to Line 3 to use on the androids there. (Of course, it was the very discovery of Cell that lead Trunks and Kuririn back to Dr. Gero's lab in order to get the blueprints Bulma used to build the switch... so maybe Piccolo defeated them...?) The ''other'' theoretical time line is one Cell ''would'' have visited, if the Trunks native to Line 2 didn't kill him, using the strength gained from his training in Line 1. This line would proceed identically to Line 1 up until Cell's discovery, as well, so the Trunks visiting this time line probably won't be strong enough to defeat Cell, if he comes from a time line where Cell is waiting to kill him if he kills the androids and...
* ''[[Haruhi Suzumiya]]'': Every instance of time travel in the stories (and there are many) invariably generates paradoxes like these. Characters go back in time to save themselves, information comes out of nowhere, etc., etc. Of course, no explanation is ever given in the books.
=== Comic Books ===
* The [[Marvel Universe]] has a simple solution for this in the novel trilogy ''Time's Arrow''. There are a
** Except when it is that way. You don't think that any two comic writers actually agree on how this stuff works, do you? That said, the ''[[Earth X]]'' series (including Universe X and Paradise X) suggests a couple of different versions of this. In the end, it is fundamentally, philosophically important that the idea that {{spoiler|alternate universes branch off only as a result of time travel}} is true.
*** This is generally accepted; however, it has been shown that Dr. Doom has invented technology that allows this rule to be broken in PAD's X-Factor run.
** This is the reason time traveling villain Kang the Conqueror keeps [[
* Grant Morrison's legendarily complex and metafictional series "The Invisibles" hinges itself on contradiction, and details several brainbending temporal paradoxes. It would perhaps be remiss to go into any of them here in any great detail. Basically, if you like that sort of thing, go read "The Invisibles."
=== Film ===
* Pretty much every film in the [[Planet of the Apes]] franchise.
* In the ''[[Back to The Future]]'' movies, Doc Brown is very concerned with paradoxes. Paradoxen. Paradoci? [PARADOCES]
** However, the effects of time travel are ''different'' in the various movies. For instance: in the first movie, Marty's accidental stopping his parents getting together was starting to delete him from existence; in the second movie, Biff interferes with his past, and the changed present has Biff saying he sent Marty to a school in Switzerland, yet this never affects the time-travelling Marty.
** [[Fanon]] has [[Justified Trope|justified]] this in various ways; for example, saying the time traveller is only affected by his own changes to the timeline, or by saying that he will be unaffected as long as there's somewhere in the timeline for him to "slot in" - changes to his situation in the new timeline are shrugged off, as long as he exists ''somewhere''.
** The documentaries on the DVD set mention how the justification was that there's some entity that regulates time itself. The partial deletion over time of Marty, why both Jennifers fainted when they met each other, and why even with relatively major changes to the timeline, Marty's family, home, and association with Doc Brown and Jennifer remain largely the same. They wanted to explore this aspect, but couldn't find a way to incorporate it into the films without it being obtrusive. [[The Other Wiki]] has more information [
* ''The Lake House'' is a story about a mailbox that delivers letters from Kate to Alex ''two years ago'' and vice versa. {{spoiler|Alex dies in a car accident on Valentines Day. Two years later, when Kate realizes that, she sends a message to Alex two years ago telling him not to be there, and he survives.}} It should be noted that the Korean movie this movie is based on dealt with the paradox differently: {{spoiler|The female character sends the warning back in time, but the male character remains dead. Meanwhile, the insertion of the warning splits off an alternate universe where the male character survives, and the movie ends with the male character meeting the female character, just as the female character is moving into the house, before she's even gotten the first letter. It's okay, though. The guy has quite a story to tell her. Since the movie ends there, by the way, it's unknown whether the female character would have ever started the letter-exchanging if the guy hadn't...ugh, it's all sort of vague, really.}}
* The horror film ''[[Triangle]]'' has loads upon loads. How it works, nobody knows, as even [[Phelous]] can tell you.
* ''[[Frequency]]'' depicts basically the same situation as ''The Lake House''--[[Applied Phlebotinum|due to abnormal sunspot activity]], a police officer and his long-deceased father are able to communicate across a 30-year gulf of time over the same CB radio set. {{spoiler|The son first saves his father from dying in a firefighting mishap, only to discover that he died of lung cancer a few years later anyway. But he then manages to convince him to quit smoking.}}
* ''[[Donnie Darko]]'': After sleepwalking away from the place where he was supposed to die, the eponymous character is caught in an unstable time loop that he must close. {{spoiler|When he moves himself and the jet engine that should have killed him back into the past, he closes the loop by dying in the way that he should have from the beginning, negating everything in the time loop.}} This causes everything that was changed by his time travel to exist outside of the normal timeline without affecting it. [[Gainax Ending|Maybe.]]
** {{spoiler|Except that the jet engine that "should have" killed him was dragged back in time in the first place - the investigation turned up the fact that, at the point when it was sitting in what used to be Donnie's bedroom, the engine was in fact still attached to the jetliner. So, if ''he'' moved the engine back in time when he went to die and close the loop, then it ''couldn't'' have gone back in time and killed him without his surviving it}}, which makes the [[Mind Screw|whole thing]] a massive paradox anyway.
*** Even worse (better?) is that {{spoiler|He didn't have to die. He just had to bring the jet engine back in time to justify it being there in the first place. You can hear Frank trying to warn Donnie by honking his car horn before the jet engine falls on Donnie.}}
* The whole plot of the movie ''Butterfly Effect'' revolves around the main character's ability to travel back in time and change parts of his life. Every change causes {{spoiler|his brain to physically rewire itself with the new memories, though, and this causes intense pain for him.}}
* ''[[Meet the Robinsons]]''. Let's see. If Goob made the catch and won, getting himself adopted and never becoming {{spoiler|the Bowler Hat Guy}}, Lewis would never have learned that Goob became that person, and never bothered to prevent it. Yeah.
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=== Literature ===
* Lazarus Long, protagonist of Robert Heinlein's ''[[Time Enough for Love]]'' creates a time machine and argues that it would not be possible for him to change the past, because in doing so he would also change the
* [[David Weber]]'s ''[[The Apocalypse Troll]]'' has the characters discussing the theories about time
* The ''Time Scout'' novels avoid Temporal Paradox by the timeline including built-in safeguards; safeguards which are dangerous to time travelers. The most prominent are first, that you can't change ''anything'' that's important to the
* In ''[[The Dark Tower
** To say nothing about what happens to Jake in the first part of [[The Dark Tower
* The ''[[
* Time travel is forbidden in [[The Dresden Files]] because it might end up destroying the fabric of reality. Characters capable of seeing the future can't be specific about their visions for the same reason.
** The Gatekeeper, specifically, has a vision of something major in the Dresdenverse, and alerts Harry to it, in the most vague, roundabout way. Bob later explains he did this to avoid the entire universe going kaput. He also mentions that no one has ever caused a temporal paradox before, and you can tell by the way the universe keeps existing.
* Some argue that [
* In ''The Anubis Gates'' by Tim Powers, main character Brendon Doyle, a modern expert on the poet William Ashbless, ends up back in the 1800's during Ashbless' lifetime. When {{spoiler|Doyle ends up BECOMING Ashbless thanks to a [[Freaky Friday Flip|body-snatching werewolf]] (don't ask), he publishes the poems from memory}}
* Distilled to its purest form in [[Fredric Brown]]'s short story ''[http://www.gutenberg.org/files/29948/29948-h/29948-h.htm Experiment]''.
* [[Gregory Benford]]'s ''Timescape'' describes a unique, quantum-mechanical approach to Grandfather Paradoxes. If a time-travelling signal were to prevent its own transmission, the signal and everything involved in triggering it would be in an ''indeterminate'' state where it neither does, nor doesn't,
* The ''[[Hitch Hikers Guide to The Galaxy]]'' universe is full of this, particularly in the third book. A correction-fluid manufacturer tries to get an endorsement from a tragic poet and ends up preventing the tragedy that inspired him. A landmark cathedral is torn down to make way for a refinery, but in order to open on time they had to start construction so far back in time that said cathedral was never built.
** Worst of all are aorist rods, which provided power to the present by depleting the power reserves of the past ... when it was discovered ''those [[Hypocritical Humor|bastards]] in the future were doing the exact same thing,'' the rods and all knowledge of their manufacture was destroyed to stop what was already happening now from occuring in the future.
=== Live Action TV ===
* In ''[[Quantum Leap]]'', it appears that Sam is affected by the changes he makes to history only after he leaps, and this has some bearing on his occasional manifestation of [[Suddenly Always Knew That|previously unmentioned skills]] (and previously unmentioned/nonexistent family members). Al, on the other hand, seems to be affected instantly, but only when probability of a new event becomes sufficiently high. (In one episode, Sam assures Al's untimely death. When the probability reaches 100%, Al is replaced by another character, but he reappears when Sam reduces the probability.)
* One has to give credit to ''[[
** "[[Doctor Who
*** The earlier example was retconned in the later one with a [[Hand Wave]] by the Doctor saying that when the Time Lords were still alive they prevented this sort of thing from happening.
** The series does tend to imply that the "Laws of Time" are more of a legal code than physical law: in "[[Doctor Who
*** Although there's the recurring concept of fixed events as opposed to unfixed ones - events that must happen in a specific way, as opposed to ones that could happen any way. The Doctor, of course, has the inherent ability to tell them apart. And, of course, no one else does. Usually.
** Also, in the old series Gallifrey had the [[Deus Ex Machina|Eye of Harmony]], a modified black hole that acted as an unlimited power source, universe-wide navigational beacon, and the mother of all temporal stabilizers. Thus even if they screwed up, the Time Lords had access to enough energy to maintain the desired timeline by brute force if necessary (as seen in The Five Doctors). In the new series, the Eye of Harmony has been destroyed, so The Doctor has less to work with.
** Another interesting use of the temporal paradox concept comes in "[[Doctor Who
** Also, "[[Doctor Who
*** To make things more interesting, [[Doctor Who
** It gets much weirder in the [[Doctor Who Expanded Universe]], which features [[Faction Paradox]], a villain group whose [[Planet of Hats|hat]] is temporal paradoxes. In fact, part of their [[Cult|initiation ritual]] involves traveling back in time and [[Self
*** At one point, they infected the Third/Fourth Doctor with [[The Virus|Faction biodata]] during a regeneration that wasn't supposed to happen (when he was shot on Dust, instead of [[Doctor Who
*** And that's ''before'' you enter the [[Eldritch Location|Eleven-Day Empire]], a place ''literally'' made of nonexistant time. Or the [[Humanoid Abomination|Grandfather]] [[Grandfather Paradox|Paradox]], the [[Anthropomorphic Personification]] of [[Future Me Scares Me|all potential evil and despair]] in the Universe. Or the part where Gallifrey's history is repeteadly raped into oblivion.
** You really have to give credit to [[Doctor Who
*** And ''then'' the Doctor brings the past version of
*** Attempts to follow this seriously may lead to [[Your Head Asplode|your head asploding.]]
** But then the Grand Moff (who wrote Blink, Christmas Carol, and other [[Timey
** Lampshaded in "[[Doctor Who
* In ''[[The Big Bang Theory]]'', in one episode, Sheldon, Leonard, Raj, and Walowitz buy the original time machine prop. Events in the episode lead to Sheldon and Leonard trying to decide if Leonard could have gone back in time to stop himself from buying the time machine, leading Sheldon to say, basically, "No."
* ''[[Lost]]'': Subverted when Sayid attempted to {{spoiler|kill Ben}}, which simply caused him to grow up into the man he already was.
** Played straight with the Compass, which is a textbook example of the abovementioned Object Paradox: looping endlessly between 1954 and 2007.
* ''[[
** This also falls into the ontological paradox category when you [[Fridge Logic|think about it for a bit]]. If the Minbari had chosen a different fighter from among the thousands at the Battle of the Line to capture, the [[Imported Alien Phlebotinum|triluminary]] would not have activated, and rather than sparing humanity they would have wiped them out. Which would mean that {{spoiler|Sinclair would never have gone back in time, which would mean they never would have gotten the triluminary (or defeated the Shadows, probably}}), which would...yeah.
*** Actually, a similar instance can be seen in the [[Haruhi Suzumiya]] anime and light novel series. In the "Endless Eight" story arc the central characters, {{spoiler|unbeknownst to themselves, relive the same eight days and nights 15,498 times before they are able to finally break the temporal loop}}. There is also an episode of [[Star Trek:
** Furthermore, if Valen, who founded modern Minbari society and taught them their [[Planet of Hats|globally-accepted philosophy]], actually learned everything he knows about Minbari society and philosophy from modern Minbari themselves, that creates an Information Loop: he is teaching them things he only knows because they taught him first.
* In the 3rd series of [[Misfits]] future Simon paid £10,000 to past Seth for the immunity to Alisha's power. He got the money from...Seth in the future. Who gave it to Simon in the future, who gave it to Seth in the past, etc.
=== Tabletop Games ===
* In the RPG ''[[
* The german RPG ''[[The Dark Eye]]'' takes a similar approach in declaring the time a dynamic, "healing" weave. An example to solve the grandfather paradox is to have the person get stranded in time, get a life, meet a woman, marry and have kids and thus becoming his own grandfather.
=== Video Games ===
* In ''[[Achron]]'' paradoxes are a deterministic and fully logical gameplay element. So pretty much a Aversion on the illogical/indefinite portion of the trope.
* The ''[[Metal Gear Solid]]'' games are well known for situations occuring in which the player can create a paradox of sorts, by killing someone in a prequel who is known to be alive in chronologically later games. Of particular note is Revolver Ocelot, in the third game, whose death during certain scenes results in an instant [[Nonstandard Game Over]]. It's especially surreal when your CO ''from the future'' starts chewing you out for causing a Time Paradox. The fact that EVA (who is never mentioned in any other game in the series AFAIK) is protected by a similar [[Nonstandard Game Over]] adds an additional layer of surreality.
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**** And, in a more immediate matter, she {{spoiler|1=is also capable of piloting the WiG, while Naked Snake is not. If she's killed, Snake cannot escape after completing Operation Snake Eater.}} As such, she has to make it through to the end of the game.
** The "CO from the future" part is actually a joke that is, for lack of a better way of saying it, lost in translation. In the original Japanese language track, the voice actor who plays this character is ''also'' the voice actor who does the Japanese dub of ''Doc Brown'' in [[Back to The Future]].
* In the ''[[Space Quest]]'' series of games, Roger Wilco is saved from certain death in ''Space Quest IV'' by a mysterious man who is later revealed to be his grown-up son from the future. Roger meets the future mother of Roger Jr. (though she doesn't know it yet) in ''Space Quest V'' and if she's killed during the course of the story, Roger Jr. and therefore Roger Sr. as well [[Ret
** However, in one way to kill off Beatrice {{spoiler|picking her up while she's frozen and having her break into bite-sized pieces}}, you get a slightly different [[Have a Nice Death]] message.
* ''Infinity'' series:
** At one point, ''[[
** In several Bad Ends of ''[[
* Time-travelling in miniature ''[[Mind Screw|into your own brain]]'' can have equally unpleasant results in ''[[The
* In ''[[
** Not only that, but at the end of the game, a sword you acquired in the future is sent back to the past. The character who takes it promises to "seal it away", the concept of "ontological paradox" is apparently entirely foreign to the protagonists.
* In ''[[Persona 3]]'', the
* The main villains of ''Tales of the World: Narikiri Dungeon 3'' are {{spoiler|the main characters}} from the future, and they are messing up the timeline to unseal the "Demon King Jababa" and defeat him before he can destroy their village. The thing is, the game implies that he got out and destroyed the village ''because they released him''.
* [[World of Warcraft]] has a quest that plays with this. While doing a survey for the Bronze Dragonflight (keepers of time), the player is assisted by his future self. Later on, he needs to do the same thing again to protect his past self.
* ''[[
** It does strongly note that the Beta Suit cannot ever benefit from the Reverse Time effects, nor can you benefit other people. For example, you cannot use Reverse Time to repeatedly kill/revive someone, your ammo/grenades will never return to you, your health won't restore from bullets never hitting you, and in one case, you cannot prevent someone from being pulverized by stepping into the path of a wind tunnel. You can, however, do some suitably amazing and crazy shit, such as reversing time and shooting from two seperate locations simultaneously; once in real time, then reverse time, move to the new location, and open fire once real time kicks in again. The Beta Suit's "mission", however, is to recover the Origin Drive from Krone's Alpha Suit.
* The [[Infocom]] [[Interactive Fiction]] game ''Trinity'' combines this with a [[Stable Time Loop]]: {{spoiler|Moments before London is destroyed by a nuclear attack, you go back in time to sabotage the original Trinity test and prevent atomic weapons from ever being used.... Unfortunately, as your [[Spirit Advisor]] explains, that would change history so that you were never born, thus creating a paradox. The universe, fortunately, resolves the paradox by making a small explosion every time one of the atomic weapons that should not exist is detonated (i.e., destroying a city instead of destroying most of New Mexico as it should) and sends you back to London before the bomb is dropped to do it all over again....}}
* ''[[
* The Ubisoft [[Prince of Persia]] trilogy is entirely based around this concept.
** In the first game the Prince's father find the Hourglass of Time whilst invading another land's fortress, and the Prince is tricked into releasing the sand within by the evil vizier. This turns pretty everyone except the Prince, the vizier and the princess from this other land (Farah) into sand monsters, leading the Prince on a quest to undo it all. He teams up with Farah, but {{spoiler|she dies during the adventure until he manages to get to the hourglass and insert the dagger, reversing everything up to the point where they originally invaded the fortress. Waking up in camp with the dagger he visits Farah and tells he everything, though she doesn't remember now naturally, since it never happened. The vizier enters, the Prince kills him, then gives the dagger to Farah and leaves, asking her to call him "Kakalukia", a word with significance to her that she told him during the adventure together. }}
** Cue the second game, 7 years later. {{spoiler|The Prince is informed by some old dude that he should have died during the first game, but cocked it up through messing round with the time continuum and is now hunted by the Dahaka, a guardian of the sands, which seeks to kill him and restore the balance. To stop this, the Prince decides to travel to the Island of Time to stop the sands ever being created by travelling back through time to kill the Empress of Time. He rescues a woman, Kaileena, and sets about trying to get to the Empress whilst dodging the Dahaka and a strange wraith-like figure seemingly out to get him. Whilst travelling to the Throne room he is confronted by both, but escapes when the Dahaka kills the wraith and buggers off. Kaileena reveals herself to be the Empress, the Prince kills her and travels back to the present, only to be confronted by the Dahaka again, since the sands turned out to have been created by the act of killing the Empress. He almost gives up hope when he discovers the mask of the Sand Wraith, which allows him to co-exist with himself in the same time-line. He then goes back in time, revealing himself to be the strange wraith-like figure, who wasn't trying to kill the prince but in fact save him. When confronting his past self with the Dahaka outside the throne room he dodges the Dahaka, allowing it to kill his old self, which reverts him back to the Prince. Confused yet? He then proceeds to confront the Empress again, but this time throw her through a portal into the present, planning to kill her here, thus still creating the sands, but not in a time frame that would allow them to be found by his father. Then the Dahaka shows up again, now trying to kill the Empress, but together they manage to defeat it and set sail for Babylon, the Prince's home. }}
** Which takes us to the third game. {{spoiler|Arriving at Babylon they find the place ransacked because by retconning his past the vizier of course never died, got hold of the dagger, and proceeded to attack it, looking for the Sands of Time. Kaileena is captured, but when the Prince tries to rescue her the vizier stabs himself with the dagger, turning into a sand god or something, killing Kaileena and infecting the Prince with the sands. Princey manages to swipe the dagger though, escape, and sets about to kill the vizier again. Along the way he bumps into Farah, who had been captured way back when the vizier got the dagger, and discovers that the sands have manifested within him as the Dark prince; a seperate personality that tries to convince him to look out only for himself. He catches up with the vizier, is soundly beaten and thrown into a well, finds his father, who is dead again, and has a crisis moment where the Dark Prince tries to take over. He resists, fights the vizier again, kills him with the dagger, Kaileena appears and cleanses him of the sands, and all seems well. Then the Dark prince pulls him into his own mind, tries to screw it all up but he resists, gets rid of him too and gets the girl. Alls well that ends well. Aside from the dead father and ruined city.}}
* The flash game [http://www.kongregate.com/games/Scarybug/chronotron chronotron] revolves around the players ability to travel back to the begining of the stage (so that multiple version of the player exists at the same time). It is quite possible to either kill a past self, or bar their passage to the time machine - resulting in a time paradox "death", complete with a [
* According to [[Word of God]], there's an active paradox known as the [https://web.archive.org/web/20140807203942/http://zelda.wikia.com/wiki/Split_Timeline_Theory Split Timeline Theory] in the [[The Legend of Zelda|Zelda universe]]. Basically, when Link defeats Ganon at the end of [[The Legend of Zelda: Ocarina of Time|Ocarina of Time]] and Ganondorf gets sealed away by the sages, Zelda sends Link back into the past where he warns the king of Hyrule of Ganondorf's intentions [[The Legend of Zelda:
=== Visual Novels ===
* The actual ''objective'' of Servant Archer{{spoiler|/Heroic Spirit Emiya}} in ''[[Fate/stay
** Besides, {{spoiler|it's said that the Heroic Spirits are removed from the time axis and await their summonings in the Seat of Heroic Spirits. So, even in the case that Shirou actually ''did'' want to become a Heroic Spirit, as Archer is no longer bound by the rules of time, Shirou's death would not form a paradox and free him from his destiny. Archer's whole objective in UBW was both attempt this plan anyway in the off-chance that it actually succeeded, and to make sure his past self didn't have to see his ideals betray him like he did.}}
=== Web Comics ===
* Paradox is notably averted in ''[[
** The comic itself likens it to the most common time travel power in video games: [[Save Scumming|"Load Game"]].
* Evil Katarakis of ''[[Starslip Crisis]]'' hasn't thought his brilliant plan all the way through:
{{quote|
** [[Time Cops|Deep Time]] isn't exactly the best off, either: one member spent spare weekends going back in time to kill Hitler, then back again to stop himself from killing Hitler. Another spends forty years on dead-end research, then tells a third agent to stop him from wasting his life on the matter. In yet another case, accidentally blowing up a planet causes an entire Deep Time spaceship to spontaneously fall apart.
*** At one point, people in the present protect themselves against attackers from the future by identifying the future guys' ancestors, and making sure they're on all the ships that the future guys are attacking.
* [[
** Reaction: {{spoiler|I'd better not create a temporal paradox! I'd hate it if everything were destroyed the way I wanted it to be destroyed!}}
* {{spoiler|Chuck Goodrich}} of ''[[
* The high cost to reality is invoked and elegantly resolved in [http://www.penny-arcade.com/comic/2004/05/03/ this Penny Arcade strip.]
* In ''[[American Barbarian]]'', [http://www.ambarb.com/?p=417 Rick refuses to do anything that would prevent their births.]
* In ''[[Homestuck]]'', most of the technology that can teleport an object thorough time and space are designed to prevent these paradoxes; appearifying an object that would cause a paradox instead creates a copy made of paradox ghost slime, which quickly collapses in a puddle of goo. It ''is'' possible to cause a grandfather paradox, but this creates a doomed [[Alternate Timeline]] marked for deletion - even if someone travels back to the main timeline somehow, they're still doomed to die.
** {{spoiler|Except for Davesprite, who seems to have dodged Fate's bullet by merging with a pre-existing entity in the main timeline, i.e. the kernelsprite.}}
* ''[[
=== Western Animation ===
* The ''[[Danny Phantom]]'' [[Made for TV Movie|movie]] ''The Ultimate Enemy'' is one big temporal paradox. In the original timeline, Danny's family and friends are killed, he goes mad with grief and kills himself (people with a [[Split Personality]] can do that and survive), and his [[Super
* Naturally enough, the animated series of ''[[Bill and Teds Excellent Adventure]]'' often courted this trope. One obvious example is the episode in which Bill and Ted neglect to buy Bill's father an antique railroad watch as a birthday present, to replace the one he lost as a child. Ted's initial plan is actually perfectly sound: [[Stable Time Loop|take the original watch from Bill's father when he 'loses' it in the past, then give it to him in the present.]] This plan fails however, so they travel even further back in time to obtain the watch ''before'' Bill's father inherits it. Of course, this should mean that
* In ''[[Invader Zim]]'', an entire episode (Bad Bad Rubber Piggy) has one scene that demonstrates this perfectly: After GIR finds out that Zim intends to send a robot back to the past to destroy Dib, it leads to this classic line of dialogue:
{{quote|
* ''[[
** Ah, everyone know time travelers are [[A Wizard Did It|surrounded by a temporal bubble]] that prevents them from being affected by their own alterations in the timesteam. The real question is: if the Legion of Doom could see through time to spy on the "secret origins" of the heroes, how do they not know the entire Justice League's secret identities?
*** No, the ''real'' question is: Why does the Legion of Doom use [[Time Travel]] for such petty activities as foiling the origins of 3 of their 11 nemeses, or stealing a few ancient trinkets? That's like using a tactical nuclear weapon to open a can of peas.
=== Anime and Manga ===▼
* In ''[[Haruhi Suzumiya|The Disappearance of Haruhi Suzumiya]]'', {{spoiler|while traveling in the past Kyon is stabbed by Ryoko Asakura. As he lies bleeding out on the ground, what appears to be a Kyon from the future comes with a Yuki and a Mikuru also from the future and rescues him. So, basically, Kyon only lived because he lived long enough to go and come back to save himself. He lived because he lived.}} My head hurts...▼
▲== Anime and Manga ==
▲* In [[Haruhi Suzumiya|The Disappearance of Haruhi Suzumiya]], {{spoiler|while traveling in the past Kyon is stabbed by Ryoko Asakura. As he lies bleeding out on the ground, what appears to be a Kyon from the future comes with a Yuki and a Mikuru also from the future and rescues him. So, basically, Kyon only lived because he lived long enough to go and come back to save himself. He lived because he lived.}} My head hurts...
** Don't forget the information paradox with the knowledge of Mikuru's mole. Kyon didn't know Mikuru had the star-shaped mole until future!Mikuru showed it to him. Mikuru herself didn't know until Kyon told her about it. When future!Mikuru realizes this, she is understandably upset, thinking she messed something up.
** Or the "Endless Eight" story arc, which finds the central characters reliving the same eight day cycle 15,498 times (quite unbeknownst to anyone {{spoiler|but Yuki}}). They finally {{spoiler|break the cycle when Kyon suggests a suitable ending to their summer
* ''[[Transformers Armada]]'', in the "Drift" episode. Starscream is blasted with the Requiem Blaster, then Highwire somehow apparently warps the kids back in time, but in an [[Alternate Universe]], where both the Autobots and Decepticons are imprisoned and slowly being digested within Unicron. Before he expires, Hot Shot reveals that the Minicons are actually Unicron's cells, and the Transformers were being used by them. Then the kids travel further back in time to when the Minicons were created. Here they tell them to escape from Cybertron, eventually resulting in them coming to Earth and all subsequent events in the story. Then, back in the present, Perceptor stops Thrust from blasting Starscream. Therefore, the kids had to go back in time to trigger the sequence of events that led them to Cybertron and ultimately the time travel event itself.
* In [[
** What's more is that Freeza {{spoiler|ordered Dodoria to kill Bardock }}{{spoiler|[[You Can't Fight Fate|specifically because]]}} {{spoiler|he feared Bardock may}} {{spoiler|[[Self
=== Comic Books ===▼
▲== Comic Books ==
* [[Booster Gold]] only becomes Booster Gold because as Michael Carter, a janitor in a 25th-century superhero museum, he steals a timesphere belonging to the time master Rip Hunter. It later transpires that {{spoiler|Booster will father Rip Hunter and teach him everything he knows about time travel}}. So if he hadn't stolen the timesphere, the timesphere wouldn't have been there to steal in the first place. Augh.
** To complicate matters, {{spoiler|Rip has to train Booster to be a time master so that Booster can have trained ''him'' to be one when he was a little boy.}}
* In [[Pre Crisis]] [[Superman]] comics, all time travel works this way, which is why Superman's ability to time travel by exceeding the speed of light is not a [[Game Breaker]]; he can travel back to the past, but he can't successfully change anything. [[The Movie]] ignores this.
=== Fan Works ===
* Link saving himself in ''[[The Legend of Zelda
===
* Another [[Sandra Bullock]] film, ''Premonition'', [[Playing
▲* Link saving himself in ''[[The Legend of Zelda (Franchise)/Fanfic Recs|The Legend Of Zelda: The Return]]''.
* Referenced in ''[[
{{quote|
▲* Another [[Sandra Bullock]] film, ''Premonition'', [[Playing With a Trope|mixes this trope]] with [[You Can't Fight Fate]]: {{spoiler|Linda's attempts to prevent her husband's death cause it, but she does get pregnant before he dies, and prevents herself from going crazy and getting committed,}} which she could not have done had she not had the premonitions of the future.
▲* Referenced in ''[[Deja Vu (Film)|Deja Vu]]'' by agent Carlin right before they send a note back in time:
▲{{quote| '''Technician:''' It would have gone faster if you had written it [the note] yourself<br />
'''Carlin:''' Yeah, then I recognize my own hand writing and the universe explodes. }}
* [[The Terminator|Fathering the guy who will send you back in time]] counts, too.
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** Actually, the premeditated part was the fact that Anderton had spent years thinking about how {{spoiler|he was going to kill the man who killed his son.}} This leads the antagonist to set up a situation where {{spoiler|Anderton thinks he's found his son's killer.}}
* ''[[Timecrimes]]'' could have been renamed ''Ontological Paradox: [[The Movie]]''. The protagonist travels backwards in time, and ultimately ends up responsible for the events that caused him to travel back in time.
* In the 2002 remake of ''[[The Time Machine]]'', the uber-Morlock explains, "You built your time machine because of Emma's death. If she had lived it would never have existed, so how could you use your time machine to go back and save her?"
* ''[http://www.imdb.com/title/tt0498567/ Summer Time Machine Blues]'' is a Japanese film that starts with a group of high school students on a hot summer day stumbling upon a time machine and using it to prevent the remote control for their air conditioner from fizzling out due to a spilled coke can. ''[[Hilarity Ensues]]''.
* An Object Loop gets [[Lampshade Hanging|Lampshaded]] in ''[[Star Trek IV:
{{quote|
'''Kirk:''' And they will be again. That's the beauty of it. }}
** [[Fridge Logic|Thinking about that a bit more]] suggests the possibility that said glasses were switched out somewhere between selling them to the pawn shop and giving them to Kirk, so the loop wouldn't be closed. It's not like there were no cataclysmic events like [[World War III]] in between.
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* Willow contains a predestination paradox (if you assume, as the film does, that prophecy really is knowledge of the future): Bavmorda's attempts to destroy Elora are the very thing that causes her own destruction, which she would not have attempted to do EXCEPT for foreknowledge that Elora was going to cause her destruction.
* As ''[[Lost]]'' season 5 deals with a [[Stable Time Loop]], this type of paradox is emerging. Kate, Sawyer, and Juliet save Ben's life, allowing Ben to grow up and turn the wheel, which causes the time travel in the first place. There may be physical examples as well: in the future, Richard gives Locke a compass. Then Locke travels to 1954 and gives it back to Richard. While it's possible Richard now has two compasses (and must later give Locke the "newer" one,) or the compass was never created.
▲== Live Action TV ==
▲* As ''[[Lost]]'' season 5 deals with a [[Stable Time Loop]], this type of paradox is emerging. Kate, Sawyer, and Juliet save Ben's life, allowing Ben to grow up and turn the wheel, which causes the time travel in the first place. There may be physical examples as well: in the future, Richard gives Locke a compass. Then Locke travels to 1954 and gives it back to Richard. While it's possible Richard now has two compasses (and must later give Locke the "newer" one,) or the compass was never created.
** The other major season 5 storyline has a similar problem. Jack's goal is to set off a bomb that will prevent their plane from crashing, meaning they'll never come to the island; completely erasing everything that's happened on the show. This means Jack will never have been there to detonate it. Interestingly, it is suggested that the explosion may end up doing the opposite of what Jack wants and leads to the plane crashing. The blast ends up creating {{spoiler|an alternate timeline where they never went to the island.}}
** Since the {{spoiler|flash-sideways were revealed to be purgatory}}, it is more likely that the blast was responsible for (or at least contributed to) the "incident" that ultimately [[Stable Time Loop|led to the plane crashing on the island.]]
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* In an episode of [[Wizards of Waverly Place]], Harper travels back in time from the future. At the end of the episode, present Harper sees a hat that future Harper is wearing. She asks where she got it, and future Harper gives present Harper the hat. But then you begin to wonder where the hat came from in the first place.
* As of the season 3 finale of [[Fringe]] it is revealed that {{spoiler|the machine left by the first people actually came to be scattered in the past by a future Walter Bishop who sent his machine back through a wormhole leading to the paleolithic era}}. This means that {{spoiler|the machine}} both came from nowhere and is infinitely old.
* Another ''[[
** Then, there's the comic relief special Time Crash: the Tenth Doctor and the Fifth Doctor meet. Ten knows what to do about a certain problem because when he was Five, he had experienced these events and watched his future self do it. When ''one of the Doctors'' points out how that makes no effing sense, they both say "Wibbly-wobbly, timey-wimey" and move on.
* In ''[[
* A ''Reverse Grandfather'' paradox occurs in the [[
=== Literature ===
* Chronos, the Incarnation of Time from Piers Anthony's [[Incarnations of Immortality]] is immune to this, to an extent. He cannot be balked by paradox, he remembers the original and the new timeline, though no one else does. The limit is that he cannot interfere with his own workings ( the "Three Person Limit" ). He can exist once, go back in time and change things, but he cannot go back in time and stop himself from changing things, thus the three person limit.
* The ultimate time paradox story is [[Robert A. Heinlein|Heinlein]]'s ''--[[All You Zombies]]--'', {{spoiler|in which the protagonist turns out to be hisheritthey's own mother, father, son, daughter, grandmother, grandfather, grandson, granddaughter, great-grandmother, great-grandfather, great-grandson, great-granddaughter, great-great-grandmother, great-great-grandfather, and so on, ad infinitum.}}
** [https://web.archive.org/web/20090919144336/http://www.xs4all.nl/~pot/scifi/byhisbootstraps.html Another Heinlein story], ''[[By His Bootstraps]]'', takes things nearly as far. Among other hijinks, the main character gets a book from the future, which he copies into another one (the same one, when it's new?) when it becomes too old and falling apart. A good way to avoid an object-based ontological paradox.
*
* In ''[[
** Not to mention, {{spoiler|Artemis had foggy memories of the past. When he went back in time, he left a note for Mulch to open the trunk Artemis and Holly were locked in. Also, the Mulch and Artemis of the past had their minds wiped, and since Artemis' wipe was a blanket wipe, there were still several remaining facts about fairies. By travelling back in time, Artemis caused himself to discover the fairy race. Whoa.}}
* Played with in the latest ''[[Thursday Next]]'' book, where they find that despite the existence of the [[Time Police|Chronoguard]], no one has actually ''invented'' time travel yet, so they assume that the technology much have been sent from the future and eventually they'll find the spot on the timeline where someone invented it to [[Stable Time Loop|close the gap]]. As one character describes it, it's like they're running the technology "off of borrowed credit." This causes trouble however, when the Chronoguard begins to realize that no one in the timeline ''ever'' invented time travel. The resulting paradox causes the system to unravel and gets rid of any further possibility of [[Time Travel]] in the series (although it seems everyone in the populace has a [[Ripple
** But by the nature of the series, couldn't someone just enter [[
* In ''[[Harry Potter and
* In ''Flatterland'' (a [[Spin Offspring]] sequal to [[Flatland]]), Victoria Line and the Space Hopper end up trapped in a black hole. They're rescued by slightly older versions of themselves with a portable white hole, producing both a reverse grandfather paradox and an object loop.
* {{spoiler|There's a human version of the object loop}} in ''[[
=== Newspaper Comics ===
*
:The timeline of this whole thing is a little paradoxical, but at least the object/information obtained has an origin.
===
▲* Unsuccesfully [[Invoked]] and thereby [[Subverted]] in ''[[Calvin and Hobbes]]'': Calvin tries to travel two hours into the future so that he won't have to write the story they're supposed to be writing for school. But the future Calvin doesn't have it, because he went to the future to get it two hours ago. Then they both travel to one hour ago because they decide that that Calvin should have written it... but he refuses on the grounds that whatever they threaten to do to him, they'll be doing it to themselves. In the end, the two Calvins return to the future empty-handed, only two find that the two Hobbeses have written the story for them. When Calvin starts reading it out loud at school, it turns out to be a story about {{spoiler|his foolish time-travel while the tiger(s) save(s) the day.}}<br /><br />The timeline of this whole thing is a little paradoxical, but at least the object/information obtained has an origin.
* In [[Achron]], pulling one of these off yourself isn't as complicated as it sounds. Usual example: You build a chronoporter (a time teleporter) at a point in time. However, your opponent, who is further in the past than you, destroys your chronoporter. Since chronoporters are expensive and essential to most late-game tactics, you send some units back in time to defend the chronoporter. Instant ontological paradox! The chronoporter only survived because it was defended by units it would chronoport later on. Bear in mind that time travel is fully logical in Achron, so what seems like a paradox makes perfect sense in-game.
** It is also possible to make a unit [[Awesome but Impractical|literally]] become [[My Own Grandpa|its own grandparent/grandchild]].
* In ''[[The Legend of Zelda|The Legend of Zelda: Ocarina of Time]]'' Link learns the Song of Storms from a man who claims that he learned it when a kid played that song seven years ago and messed up his windmill. Link then travels back in time seven years and plays the song, messing up the man's windmill.
** Now the real question is, ''where did the Song of Storms originate?''
** To even further compound the
** [[The Legend of Zelda]]: Oracle of Ages features a few instances, notably during one of Link's interactions with the gorons:
*** In an item trading puzzle, you trade a rock briquette to a goron in exchange for a family heirloom and then trade the same heirloom to an ancestor of the previously mentioned goron so he can hand it down across generations to his descendant who trades it to you so you can trade it to his ancestor who hands it down to him [[Overly Long Gag|who trades it to you]]...
* ''[[Strange Journey]]'' has a rather curious form of this. In the second sector, you find a group of Disir whose time-control powers have been stolen by Yggdrasil. They send you to the future to battle him, but since he's so powerful, he'll just utterly [[Curb Stomp Battle|curb stomp you]] with a hearty [[Evil Laugh]]. Moments later, as you drift into unconsciousness, another guy pops up in the battlefield and starts hitting Yggdrasil. Moments later, you return to Sector Two, and the Disir tell you the battle's now engraved in your destiny. Fast-forward to Sector Five, and you find yourself in a very familiar battlefield, with a sleeping Yggdrasil, and a destiny goddess who reminds you you have to save yourself before Yggdrasil kills you in the past...
* The issue of paradox is averted in ''[[Second Sight]]''. Throughout the game, it appears that John Vattic is coming across information pertaining to peoples deaths, and then projecting himself back through time to avert them. The finale [[The Reveal|reveals]] that {{spoiler|the parts which Vattic thought were the "present" were actually potential futures he was seeing through precognition. So he was ''predicting'' deaths which hadn't actually happened, rather than averting deaths through time travel (which would create the paradox of why he would need to travel back in the first place.}}
* The entire plot of ''[[
** Result: There are [[Stable Time Loop|an infinite number of Sedas who both do and don't Time Travel]].
** And before you even get to that, there's that whole ordeal in Queens. After the boss battle, Rando breaks the Life Sphere, intending to return 100 year to the past with La Saia so they can get married. [[Fridge Logic|Since when is Time Travel defined as a feature of the Life Sphere?]] We're left with the same problem: if Rando and La Saia get married, La Saia never commits suicide because Rando never got the Life Sphere, resulting in La Saia's ship never being sunk, which should completely remove the Shipwreck dungeon from the game, which would mean that the Turtle was never built, meaning that Toan never did anything in Queens. And without a dungeon to go to, there's no place for the Atla to end up, so the town itself was never destroyed.
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* ''[[Dragon Quest V]]'' makes use of the Reverse Grandfather Paradox: you travel back time to meet your child self, who keeps a piece of [[Applied Phlebotinum]] that would prevent the world from total annihilation. You switch that piece with a fake, knowing that the [[Big Bad]] will kidnap your child self and destroy the thingie.
* An example of the Object Loop occurs while recovering the key to Karazahn in ''[[World of Warcraft]]''. The key, as found in the present, was beyond the skills of Khadgar to repair and so was taken back in time to be given to Medivh. Due to the damage suffered by the key, Medivh could not immediately repair it, instead giving the player a spare key. The key he was repairing would be given to Khadgar, to continue its trek into the future to be broken and taken back, ad nauseum.
* In [[Sonic the Hedgehog (2006
** In this same game, Mephiles the Dark decides upon his name when Shadow addresses him by it. Mephiles then goes back 10 years and introduces himself to Shadow, who learns his name. Thus, Mephiles learns his name from Shadow and vice versa.
* The ''Journeyman Project'' series works on information paradoxes. The [[Time Police]] protagonist is only prompted to go back in time when monitoring devices report historical alterations. Thus, once his mission is completed, there was never a reason to go back in the first place. The only major loophole the series provides is the rule that anything travelling back in time while a temporal overwrite is moving forward ([[Timey
* Ubiquitous in ''Infinity'' series:
** ''[[Ever 17]]'': Information Loop in {{spoiler|Blickwinkel telling You'haru the plan to save Takeshi and Koko, and You'haru explaining ''him'' the plan 17 years later.}}
** ''[[Remember 11]]'': Both Information Loop and Object Loop with Yuni's terabyte disk, which travels endlessly between 2011 and 2012 and back. [[Epileptic Trees|Possibly]] Reverse Grandfather Paradox in {{spoiler|"player's" involvement in the story, as "it" corrupts [[Dead Little Sister|Sayaka]], causing Satoru to devise a plan to summon and send it back in time, making "it" corrupt [[Dead Little Sister|Sayaka]]...}}
* At the climax of the Doc Gets Rad chapter of ''[[
▲* At the climax of the Doc Gets Rad chapter of ''[[The Adventures of Dr. McNinja (Webcomic)|The Adventures of Dr. McNinja]]'', villain {{spoiler|Sparklelord}} is sent back in time to the moment when he originally entered from [[Another Dimension]]. This version apparently overwrites the original copy of him, but without any accumulated memories, thus condemning him to repeat the same sequence of events for eternity. So there is an infinite quantity of him entering the loop, but nothing coming out... huh? Presumably, the only reason the universe doesn't implode is that the comic runs on the [[Rule of Cool]].
* Trying to understand a complicated series of events in [[Irregular Webcomic]] seems to lead to this conclusion. Two characters are captured for [[Organ Theft]] purposes. Their future selves come to save them, but end up being captured as well. The original pair having their organs stolen survive by stealing the organs from their future selves, but eventually come across their original organs, and put those in them as well so that when their organs are stolen, only the spares are taken. [http://irregularwebcomic.net/1871.html It's all very complicated]. Of course {{spoiler|The characters end playing a part in destroying the universe by destroying the only time machine in existence instead of using it to become their future selves.}}
* In [http://faultylogic.comicgenesis.com/d/20071006.html this] Faulty Logic comic the main character builds a time machine to steal ideas for comics from his future self, only to have them stolen by his past self several seconds later. In essence, these ideas only exist for several seconds, over and over again.
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** For a more minor example, at one point Jade complains to John that [[Running Gag|her pumpkins keep disappearing]] so John sends her some pumpkin seeds for her birthday. However, these get sent back in time, and it is receiving that present that inspires Jade to start gardening in the first place.
** For another, we have one of John's conversations with Karkat, who is trolling him backwards through time. Karkat claims that John told him that humans hatch as slugs instead of being born, and John tells him that's completely false but thanks him for the pranking idea. Sure enough, in John's next conversation with Karkat, he tells him exactly that and Karkat believes him.
** For ''another'', much later on Karkat opens a memo only to be distracted by himself from ten minutes into the future angrily responding to it. Throughout the course of this conversation present Karkat becomes [[
* [[SSDD]], Doctor Cook claims that he got on the Maytec board of directors using stock market information from a PDA that was accidentally sent back in time. But then he locked up the present day version of the PDA and made sure it was never sent back, he noted that the future version didn't disappear or anything.
** Also the Anarchists were prevented from stealing the ''Wildfire'' time machine and using it to build the ''Inglourious'' fifty years earlier. Unfortunately they still have it, centuries before it wasn't built.
=== Web Original ===
▲== Web Original ==
* Tom Francis' [http://www.pentadact.com/index.php/2007-02-28-machine-of-death-exploded "Exploded"] uses the "information" variant. Two guys invent a machine that predicts how one can die. While one can ''postpone'' one's predicted death, one cannot avert it entirely. The invention makes both men fantastically wealthy, and miserable.
* The Reversed Grandfather Paradox is lampshaded for all it's worth in ''[[Red vs. Blue]]'' when Church is send back in time and attempts to prevent the accident that started the entire time travel problem.
** {{spoiler|Captain Flowers dying from a heart attack in his sleep?}} He died from the heart medicine Church gave him to prevent that.
** The tank's AI named Sheila?
{{quote|
'''Church:''' ''"What? Your name is Sheila!"''
'''Tank:''' ''Name overwritten. You may now call me Sheila."'' }}
** {{spoiler|Sheila killing Church because of the friendly fire setting?}} Guess who changed the default setting.
=== Western Animation ===▼
▲== Western Animation ==
* In the first ''[[Futurama]]'' [[The Movie|movie]], the "paradox-free time travel" isn't quite paradox-free: {{spoiler|there remains an ontological paradox surrounding the origin of the name "Lars," as future-Fry chose that name when he realized that the injuries he sustained when Bender attempted to kill him made him Lars.}} From whence did the name come? No one knows.
** I do. {{spoiler|Fry was trying to say "Ow, my larynx", but the damage to his larynx made it sound like "Lars". The original Lars must have chosen the name at that moment. Paradox, schmarado- Oh, wait. The original Lars wouldn't have existed since without a Lars to send Fry into depression he wouldn't have gone back in ti-}} Oh, no. I've gone cross-eyed.
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** Additionally, the temporal tattoo is an ontological paradox. At the end of the movie, Bender peels it off Lars's ass, takes it back in time, and puts it on the present Fry's ass. Thus, it was never actually created, and just loops through time eternally with no beginning or end.
** Fry's genetic material. Being his own {{spoiler|paternal grandfather}}, the question is where exactly the information carried on his y-chromosome originated.
* The ''[[Star Trek:
* ''[[
** [[Magnificent Bastard|David Xanatos]] [[Xanatos Planned This Index|planned out his fortune]] by time-travel. While in the past, he had a mundane coin and a note sent to his future self. The coin becomes a rare object worth a few thousand and the note contains instructions on how to invest the money.
** The Archmage goes back in time, rescues his past self from falling into a chasm, then schools him on how to acquire the objects that gave him the power to, among other things, go back in time and rescue his past self from falling into a chasm, then school him--
** The Phoenix Gate. It goes through all the events of the series, until Goliath sends it to the distant past to escape Puck's grasp and eventually gets discovered in the first place. The loop is looped.
* In ''[[The Transformers (
* This happens in the ''[[My Little Pony: Friendship Is Magic
** The whole episode is this. Past Twilight is so bewildered and amazed by the concept of time travel that she can't shut up, and future Twilight doesn't manage to tell her what the actual thing she's supposed to be averting is before she gets sucked back to the future: all past Twilight knows is that future Twilight was from the following Tuesday. So she spends the week panicking about it, ends up with all the injuries future Twilight had when she visited, and by Monday night concludes the only way to stop whatever will happen by Tuesday from happening is to stop time. {{spoiler|So she goes to the archives, but as Tuesday morning arrives, nothing happens, but she finds the time spell and goes back in time to warn herself not to worry about the future...}}
▲=== Unclassed, multiple or [[Timey Wimey Ball|confused]] Examples ===
* Improperly invoked in ''[[Light and Dark
▲== [[Fanfic]] ==
▲* Improperly invoked in ''[[Light and Dark The Adventures of Dark Yagami (Fanfic)|Light and Dark The Adventures of Dark Yagami]]'', after Blud learns that Matt survived a car crash with "Yotsuba", he decides to write Matt's name in his Death Note in the future to kill him in the past. This results in the past changing, with Matt dying and Yotsuba surviving. Dark claims the reason why Blud is telling him and Light this now, rather than at the point in the future when he writes the name is "Its one of those time [[Rouge Angles of Satin|parradoks]] that they have in [[Back to The Future|back to the future]]".
** Dark's exact words are "Oh I didn't tell you my death note can also kill people in the past and I am going to write his name in it in the future to kill him in the past and stop him stealing the death note." [[Sarcasm Mode|Hope that clears up any confusion.]] It doesn't help that the flashback scenes go from "Present Day" to "Meanwhile in the Past" to "Back in the Future"
* In ''[[Megaman Star Force Orion]]'', Amaya and Taisaka decide to go back in time to prevent Kiri from making contact with the Ice Goddess Talisman. With the help of the UMA Fire, they reach the year in which Kiri is exiled from her home. Fire then brings them 2 years forward in time, and Taisaka and Amaya meet Tagekai, who reveals that Taisaka was originally a member of Tri-Clan. This causes Taisaka to break down as Amaya abandons Taisaka, soon meeting Takeshi's former self. Takeshi later reveals he has memories of everything that occurred as he was 66, as he is trapped in that age. Taisaka changes herself by telling her younger self not to fight Tagekai which causes her to become exiled. Amaya and Taisaka bring Kiri to the Omnikron Temple, and Amaya meets Eidaya, explaining everything. This creates a major time paradox, which causes the already fragile sands of time to become even more fragile. Soon Amaya returns to the past, meeting his father, who realizes that Amaya is Amaya, and he travels after him. As Amaya tries to fix things in Tri-Clan, Takeshi reveals he killed Taisaka, and Daisuke King, a Time Traveling Kamen Rider, shows up and brings Amaya to the present. He warns Amaya that Ryo is about to be killed by a Shinigami named Albano, and if this were to happen, the future would be corrupt, as Takeshi would cease to exist in the present. At the same time, Amaya's father plans to force time into 11:60 PM on December
=== Film ===
* ''Millennium'' concludes with a massive paradox barrelling its destructive way into the future whose time travel efforts caused it.
* Played with in ''[[Primer]]''. As one of the characters says, "The ''last'' revision is apparently the one that counts." We find characters gradually losing their worries about causality; they wind up going back in time to relive the events of that same week in their original
* ''[[
* French-Canadian movie based from a cult tv show ''Dans une galaxie près de chez vous 2'' featured a spatio-dimensional rip (shaped like a zipper) who goes to present Earth. The Capitain was able to chuck down a DVD with their plea ([[Green Aesop|NOT to destroy the ozone layer]]) recorded on it. It backfired when the video got featured on ''[[YouTube]]'' and ridiculed as "[
* ''[[Austin Powers]]: The Spy Who Shagged Me'' shows Austin briefly attempting to reason why no time paradox has occurred due to he and Dr. Evil time traveling to a date where they logically shouldn't be. Basil Exposition puts his mind at ease
{{quote|
Austin (also facing audience) "Yes" }}
* The reason the universe is ending in ''Star Crossed'' is because of all the various paradoxes created by the Federation, from [[Star Trek|Jim Kirk]] to [[Star Trek: Voyager|Captain Janeway]].
=== Literature ===
* In ''Strange Attractors'' by [[William Sleator]], almost any time travel to the past causes instability in the universe. As those instabilities add up, the entire universe can "go chaotic", essentially becoming a huge mass of paradoxes. The only noticeable effect of this is that electrical lighting flickers. In fact the timeline in the series is so fragile you can cause paradoxes by going so much as five minutes into the ''future''.
* In Ted Chiang's short story ''The Merchant and the Alchemist's Gate'', the titular gate can transport anyone exactly twenty years into the future, or twenty years back. This leads to increasingly more improbable shenanigans, starting with a [[Stable Time Loop]] involving a treasure map, and reaching its arguable peak when {{spoiler|a character's wife meets her husband's younger self in the past, takes him to the bedroom, and upon descovering his lack of the, er, skills that the husband has in the present, teaches him how to please a woman, over the course of weeks. It's also implied that the husband married her in the present because, when he saw her, she reminded him of the middle-aged woman who took his virginity.}}
* In [[L. Sprague
* The novel ''Ice And Blood'' manages to produce a very strange reverse grandfather paradox. ZJ is a depressed, bipolar paranoid schizophrenic who has no memories of his childhood. He hates his life enough to deliberately break into a lab where time travel technology exists, he goes back to the past, and he kills his parents in the hopes he'll stop existing. Instead the violent and bloody deaths they suffer triggers his past self's mental illness. The obvious problem with this is that there's no guarantee that ZJ would suffer the exact same breakdown and block out his memories every time, nor is there any logical reason that depressed ZJ would ever go this route again when suicide would be significantly easier for him. It just doesn't work from a logic standpoint. (It's still a good read if you apply enough [[MST3K Mantra]] to it.)
=== Live Action TV ===
* In the ''[[Star Trek]]'' [[
* ''[[Star Trek: Deep Space Nine]]'' has an episode with Chief Miles O'Brien going forward in time a few hours and then, when he feels he's about to die, sends his future self in the past to take his place and prevent the disaster.
{{quote|
** One way this could work is that the original Present Miles was from and the Past he goes to have become [[Alternate Universe
** And in ""Trials and Tribbleations":
{{quote|
'''Dulmer''': A time loop? That you were meant to go into the past?
'''Sisko''': Um... no.
'''Dulmer''': Good.
'''Lucsly''': We hate those. }}
** Narrowly averted in the episodes "Past Tense I & II", where-in Sisko successfully impersonates a historical figure after the man is killed (saving Sisko's life no less) before he can make the [[Heroic Sacrifice]] for which history remembers him. That Sisko bears an uncanny resemblance to historical record of the man's appearance becomes something of a [[Brick Joke]] in later episodes.
** Deep Space Nine had plenty of other time-travel episodes, mainly due to the presence and involvement of the [[Sufficiently Advanced Aliens|Wormhole Aliens/Prophets of Bajor]] who existed ''outside of time'' preventing any danger from a paradox. The hand-wave itself is even lampshaded in the resolution of "Accession"
* When, in the ''[[
=== Tabletop Games ===
* In the [[Time Travel]] RPG ''[[Continuum]]'', if a time traveler creates a paradox, they accumulate "frag," and if they accumulate too much, it eventually causes them to unravel. What's more, unchecked temporal paradoxes will eventually lead to the unraveling of reality itself. Much of the game centers around the players, who are part of "The Continuum" trying to fix paradoxes deliberately created by time travelers (known as "narcissists") who don't believe the official line on paradoxes, and who want to mess with the timeline for their own personal gain.
** Similarly, the expansion sourcebook (currently trapped in [[Development Hell]]) ''Narcissist'' has a different take on
* Time Travel is rare in ''[[Warhammer
* Averted in ''[[
* In ''[http://dig1000holes.wordpress.com/time-temp/ Time and Temp]'', a paradox would [[Ret
* The ''[[
=== Video Games ===
* In the RTS [[Achron]], you can use the free form time travel to create some interesting paradoxes. Apart from the Grandfather Paradox and the Ontological Paradox in many different incarnations, you can create a stable feedback loop to continuously strengthen your army. For example, if 10% of your army survive an attack, you can send these back in time to support their past selves in battle. That way, more units will survive and more units will get sent back in time. Thus, more units will survive. It can also happen the other way around, with your army getting continuously weaker, but that is much rarer and harder to spot. For example if the units you send back in time chronofrag (similar to [[Tele Frag]]) their past selves. Since all players have these abilities, results can get quite unpredictable.
* In ''[[
** It is implied ingame, by the main characters no less, that there was an 'entity' or outside force making them travel through time. This means it's less of a headache, if someone with UBER POWER is driving the time bus.
** The [[Updated Rerelease|DS remake]] manages to make it even worse. There's now a sidequest that involves combining an object with ''itself''. Causality is Crono's bitch.
* ''[[
* In ''Ratchet and Clank Future: A Crack In Time'''s main focus is the Great Clock, which, originally designed to keep time, {{spoiler|/is being sought out by the villains to ALTER time. Orvus states this would create multiple paradoxes and blow up the universe.}}
* ''[[
** In ''Phantasia'', it works like this: Trinicus Morrison sends Cress and Mint 100 years back in time to acquire the power (magic) needed to defeat [[Big Bad|Dhaos]], since they couldn't get it in the present (nevermind the fact that Dhaos was literally about to waste the lot of them with his lazers). In the past it turns out that the reason magic didn't exist in the "present" was because its source withered and died, so it's less "get magic" more "keep magic from dying". They succeed but wind up getting drafted to help out in a war against Dhaos, and during said war Edward Morrison (ancestor to the guy that sent you back in the first place) sacrifices himself to prove to one of your party members that Dhaos's methods ''are'' evil. Problem is, according to history and the opening cutscene-battle-thing Edward was one of the people who fought Dhaos in the past and forced him to flee to the "present" where he got sealed; with him dead, history would be pretty much fcuk'd, so the party takes it upon themselves to engage Dhaos in the past (with Arche taking the place of Edward and [[The Hero|Cress]] and [[White Magician Girl|Mint]] taking the places of their respective ancestors). Dhaos flees through time like he was supposed to after that, and after finding the time machine the party returns to the "present" at the point right after Trinicus sent Cress and Mint back twenty-seven hours ago.
* ''[[Time Hollow]]'' for the DS subverts these, for the most part, by having a few people remember all alterations - as such, you can't hit the "prevent myself from adjusting time" snag by fixing the thing you wanted to change. There is, however, of all things, a {{spoiler|cat}} that ends up in a near-ontological paradox avoided only by the fact that {{spoiler|it's locked in time and cannot age.}}
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* ''[[Ecco the Dolphin]]'''s time paradox consisted of Ecco seeing the Asterite, who tells him to go back in time and recover its missing globe from the Asterite of the past. That means that in the past, a dolphin stole the Asterite's globe, and only because of a request from the future.
* As part of its recurring themes of [[You Can't Fight Fate]] and [[Screw Destiny]], the ''[[Legacy of Kain]]'' series establishes that time travel always creates a [[Stable Time Loop]], where if you try to change history on your own, the timestream just re-establishes itself as it is meant to be as though you weren't even there, like a river flowing around a stone. The only way to truly alter time is to cause a paradox by bringing the same object or person from one time into close proximity with itself in a completely different time. This creates a disruption in the timeline strong enough to alter history in ways that cannot be predicted, the butterfly effect occurring and history shifting itself around to fit the new chain of events. The main item for this task is the [[Sword of Plot Advancement|Soul Reaver]], due to it being wielded by a variety of powerful figures including the two protagonists, and thus bringing two swords into contact means someone of historical importance is going to die.
** This mechanic is actually the crux of the ''entire plot''. Because time travel always creates a [[Stable Time Loop]], it means free will doesn't exist, [[You Already Changed the Past]] and [[You Can't Fight Fate]]
** At one time there's actually a ''four-way'' paradox - during the climax of ''Defiance'', you've got {{spoiler|Past Kain wielding the Soul Reaver that belongs in this time, Present Kain traveled back in time with the original Reaver taken from a point in time further in the past before it became the Soul Reaver, Raziel traveled back in time with the spectral version of the Soul Reaver that was created when the material Soul Reaver currently wielded by Past Kain was destroyed in the future, and Raziel himself who will eventually be drawn into the Reaver wielded by Present Kain to become its spectral half and transform it into the Soul Reaver. Oh, and the Reaver that Present Kain is wielding will also have to be taken back in time at some point after absorbing Raziel's soul so he can leave it for his past self to find and thus leave the timeline up to that point intact.}} [[Viewers Are Geniuses|Got all that]]?
* ''[[Jak and Daxter|Jak 2]]'': Try to keep up: [[Wrench Wench]] Keira found a "rift rider" (basically a time machine) just lying around (just go with it). So everyone gets in, flies to the future and land in a dystopian city. Keira and her father get away, but Jak is captured and the rift rider is destroyed. 2 years passes. The game starts. When you meet up with her again, she's working on another time machine, trying to recreate the one they found from memory. During the game, they meet up with a kid who looks a lot like Jak. At the end of the game, Keira finishes the rift rider so they can go home. But they have to take the kid with them who turns out to be {{spoiler|a young Jak. It turns out he was born in the future}}. So they have to take him on the rift rider back to the past so he can {{spoiler|be raised and come back to the future}} and fulfil his destiny, because it turns out that the rift rider Keira built from memory wasn't a replica, but the very same one they found in the past. So they have to go to the past to drop off the rift rider, so past Keira can find it and then go through the rift back to the present and [[Austin Powers|Oh no, I've gone cross-eyed]].
** Daxter sums it up for us.
{{quote|
'''Daxter:''' Honey, the more you think about it, the more it hurts the head! }}
* ''[[Sonic the Hedgehog (2006
** Mephiles hates Shadow for sealing him, and attacks when he's freed. Shadow hates Mephiles for attacking him, and seals him. What?!?
* ''[[
=== Web Comics ===
* ''[[Something
* [https://web.archive.org/web/20140705053535/http://www.cheercomic.com/?date=2008-01-31 This is confusing.] How is a flashback to the childhoods of the ''[[The Wotch|Cheer!]]'' girls even possible? Weren't they, you know, ''boys''? Just how much of the past did Miranda rewrite to cover up Anne's mistakes? Is it like what happens when a [[Misfile]] occurs? Argh...maybe it's best to pretend this isn't canon, especially seeing as there are [http://thewotch.com/index.php?epDate=2005-10-11 lots of] [http://thewotch.com/index.php?epDate=2005-10-19 people] [https://web.archive.org/web/20140705044639/http://www.cheercomic.com/?date=2006-05-30 who still remember.]
** Well, three of the girls do not remember ever being anything ''but'' girls, so presumably their memories were altered. [[Plot Hole|As for Jo...]]
* In the Surreptitious Machinations arc of [[General Protection Fault]], Empress Trudy travels back in time to give her younger self the necessary information on what she must do to take over the world. Near the end of the arc, Nick and Ki's son Todd reveals that the entire [[Bad Future]] he and Empress Trudy came from was the product of a temporal paradox, since it could not have happened without Empress Trudy advising her younger self, which would not be possible if it did not previously exist. It is heavily implied that {{spoiler|Pandemonium}} was responsible for the existence of the alternate future in the first place. As a result of the future being changed, Todd, the Empress and all other objects from the alternate future fade from existence, but the Empress teleports to a different time just before she fades, and the Gamester finds and recruits Todd.
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=== Western Animation ===
* ''[[The Fairly
** Well the original timeline seems to be that 70's Cosmo is that cause of Crocker losing him and Wanda. Timmy then stops this incident only for present day Cosmo to turn on the mic while Timmy is talking and cause the incident to happen anyway. While this doesn't explain how Crocker knew about the existence of fairies after his mind was wiped in the original timeline, since we don't see the original incident play out, we can just assume any number of reasons for that. (Perhaps he managed to write a note in that timeline too)
** There was also a [[Historical
* In ''[[Justice League]]'', Lord Chronos was at first a meek scientist who invented time travel. He used it to steal things from history that would not affect the timeline. Then his wife nagged him about his lack of imagination, and one trip to the Wild West later he's decided that stealing the most famous items from history and setting himself up as master of space and time is the better way to go. Reality itself falls apart, so he decides to go to the beginning of time and do it all over again. Batman and Green Lantern manage to reset history.
** Batman also manages to create a close [[And I Must Scream]] moment by trapping him in an eternal loop of his wife's naggery.
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{{reflist}}
[[Category:Narrative Devices]]
[[Category:Time Travel Tropes]]
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