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{{trope}}
[[File:
{{quote|''"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 [[Buffy-Speak|wibbly-wobbly]]... [[Trope Namer|timey-wimey]]... [[Metaphorgotten|stuff]]."''
|'''The Tenth Doctor''', ''[[Doctor Who]]'', "[[Doctor Who/Recap/S29/E10 Blink|Blink]]"}}
Excepting [[The Slow Path|mundane travel from the past to the future at a rate of one second per second]],<ref>For all you physics buffs out there, yes, this does imply that [[Time Travel]] is unitless.</ref>
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 [[You Can't Fight Fate]] (or at least not without the [[Butterfly of Doom]] coming along), but the next you can [[Screw Destiny]] and [[Set Right What Once Went Wrong]] by [[Hitler's Time Travel Exemption Act|killing Hitler]] and changing the past for the better. Especially headachy because there's no [[Temporal Paradox]], or if there is it's totally arbitrary.
The standard [[Hand Wave]], 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 people absolutely ''frickin' '''HATE''''' time travel...
Despite the similar images the name might conjure, this is unrelated to [[Swirly Energy Thingy]] (although a [[Swirly Energy Thingy]] might very well have Timey Wimey effects). Likewise, a [[Continuity Snarl]] is not necessarily related, though the presence of [[Time Travel]] induced [[
Compare [["Close Enough" Timeline]]. Occasionally, anything involving this may decide to pull out the [[Temporal Paradox]] card. A [[Time Crash]] is what happens when this ''isn't'' in play. See also [[Narnia Time]]. [[Conflict Ball|Totally]] [[Distress Ball|unrelated]] [[Smart Ball|to]] [[Sanity Ball|ball]]-[[Idiot Ball|shaped]] [[Hero Ball|behavior]] [[Villain Ball|tropes]] and possibly [[The Multiverse]]. You had better hope it is unrelated to [[Happy Fun Ball]].
'''Warning: High chance of spoilers.'''
{{examples}}▼
▲{{examples}}
== Anime and Manga ==
* ''[[Mahou Sensei Negima]]'': Time travel watches pop up during the Mahora Festival arcs, creating [[Stable Time Loop
* ''[[Mahou no Iroha]]'': Time travel is apparently very possible with the help of magic, and the [[Magical Girl]] main character somehow changes some things but not others that leaves readers scratching their head.
* ''[[Haruhi Suzumiya]]''. [[Stable Time Loop
* ''[[Tsubasa Reservoir Chronicle]]'': Feather. Reservoir. The fucking up of the entire time-space continuum. Time travel duplicates. Clones? Parents? Putting what is confusing about the time travel involved into words is, in itself, extremely confusing.
* ''[[Natsu no Arashi]]!'' 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
* When time travel is introduced to ''[[Dragonball Z]]'' it is assumed that Trunks travel backward from his [[Bad Future]] and warning the heroes about the Androids means that they will be able to defeat them and change his own timeline. Eventually, he travels back again, and finds that things are not playing out as they did in his own history. This is further complicated by the appearance of Cell, who travelled back from a timeline in which Trunks disabled the Androids before being killed by Cell and having his time capsule stolen. Trunks eventually concludes that nothing that happens in one timeline has any bearing whatsoever on another (meaning that killing the fetal Cell in the "present" won't retroactively destroy the Cell they are fighting, and there is a third Cell waiting for him back in his own timeline, which won't be affected by the Androids being stopped in the "present").
* The Manga [[Doraemon]] explains that changes in the past can still result in the present outcome. The analogue given was that there are many routes to get from point A to point B in time, and the journey through each routes are different, but yet still results in the traveller getting to point B in the end. So it is possible to get to the same outcome, even if the events played out differently.
* In ''Time Agent'', your objective is not to win. Your objective is to have already won... without Time Travel being invented. [[Mind Screw|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.▼
* In ''[[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 [[Time Crash|destroy the universe]].▼
* There's a ''[[Back to The Future]]'' 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?▼
== Comic Books ==
* In the 1980s Marvel ''[[Transformers]]'' 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.}}
* [[The DCU]] has all sorts of fun here, especially when [[Booster Gold]] is involved, but it's been proven time and again that trying to [[Screw Destiny]] usually ends badly. Aside from that, the
* ''[[The Legion of Super Heroes]]''. Let's start with how [[Continuity Snarl|there's ''three'' of them.]]
** One of their enemies, the Infinite Man, is the [[Anthropomorphic Personification]] of the
* An issue of [[The Flash|Impulse]] had a mad scientist 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 [[Butterfly of Doom]], 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 [[Insane Troll Logic|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
* While we're talking about [[The Flash]], Professor Zoom has (retroactively) had his hands on the
** And then the Professor started in on Barry's history, and we ended up with [[Flashpoint (comics)|Flashpoint]]. [[Nice Job Breaking It, Hero|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
** The second Zoom came into being because he tried to grab the
* Say the word "Kang" to a fan of ''[[The Avengers]]'' 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 Spider-Man, Iron Man or 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.
* Limbo in the Marvel Universe (mainly shows up in association with ''[[X-Men]]'') 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.
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* Marvel Comics' "[[Adam Warlock]]", specifically his evil futureself 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. Most recently, to seal the Fault in space caused, in part by the Annihilation Wave, The Phalanx Invation, 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.}}
== Fan Works ==
* ''[[Kyon: Big Damn Hero]]'' has much more [[Time Travel]] going on than [[Haruhi Suzumiya|the original]]
* In ''[[My Immortal]]'', 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.▼
▲* ''[[Kyon: Big Damn Hero]]'' has much more [[Time Travel]] going on than [[Haruhi Suzumiya|the original]] -- to the point that at any point of story there is at least one open [[Stable Time Loop|loop]]. Amusingly, Kyon once [[Shout-Out|quoted]] [[Doctor Who|the Doctor]] when trying to explain his understanding of [[Time Travel]].
* In ''[[Harry Potter and
▲* In [[My Immortal]], 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.
▲* In ''[[Harry Potter and The Methods of Rationality]]'', 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.
{{quote|'''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.
* Used to great effect in ''[[The 10 Doctors]]''. It's even mentioned by name as to how all ten Doctors can be in one place at the same time.
** The sequel fic ''[[Rich's Comix Blog|Forever Janette]]'' intentionally invokes the Timey
==
* The whole messy issue of [[Time Travel]] is [[
* ''[[Back to The Future]]'' 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.
* ''[[Hot Tub Time Machine]]'' steadily makes less sense as the film goes on, as [[Rule of Funny]] takes over.
* ''[[Bill and
** 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...
* ''[[The Butterfly Effect]]'' has the events of roughly half of Evan's blackouts caused by his older self [[Mental Time Travel|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.
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** 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?
* In ''Femme Fatale''... y'know what, screw it. You watch it and tell me what the hell that movie was about. {{spoiler|Was it [[Time Travel]]? [[Or Was It a Dream?]]?}}
* ''[[Frequency]]'' is one big
** Not to mention that 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.
** In ''Johnny and the Bomb'' Pratchett explains that most time
* ''The Lake House'' was a horrible mixture of [[Time Travel]] 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 let's not forget the dog in the past timeline who responded to the name given to it in the future timeline.
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** Though one persistent law of [[Time Travel]] is that things can only [[Time Travel]] 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 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. [[Wall of Weapons|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.
* In [[The Film of the Book|2002 film version of]] ''[[The Time Machine]]''
* ''
* James P Hogan had a solution in ''Thrice Upon a Time''. The prospective time traveller 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 traveller 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.▼
▲* ''Ben10 Race Against Time'' includes a bit of this. [[Big Bad|Eon]] seeks to use the Hands Of Armageddon to bring his [[Dying Race]] 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.
* ''[[Primer]]'' uses an [[wikipedia:File:Time Travel Method-2.svg|interesting]] time travel method that begins to make sense.
* The film version of ''[[A Sound of Thunder]]'' (if not [[A Sound of Thunder|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!
== Literature ==
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** He questions the first paradox, but eventually gives up trying to figure it out.
* In the [[Philip K. Dick]] short story "Meddler" those in the present are able to see into the future and discover {{spoiler|[[The End of the World as We Know It|the world completely devoid of human life]],}} - so they {{spoiler|[[Stable Time Loop|send a guy forward to figure out what happened. He winds up bringing back horrible, fast-reproducing, stinging, poisonous "butterflies" that go on to kill everyone, thus the doomsday future is brought about by the decisions people made in the present to prevent it]].}} One can only hope they would just {{spoiler|[[Fridge Logic|look at the future again to figure out a way to kill the things]].}}
* ''[[The
* In [[Jasper Fforde]]'s ''[[Thursday Next]]'' novels, not only do the rules of [[Time Travel]] make no sense whatsoever, the main character (whose father is a time-
** In ''[[Thursday Next|First Among Sequels]]'', there is a subplot revolving around the fact that the time-
* David Gerrold's ''The Man Who Folded Himself'' features a time-travel belt, which has the
* [[Harry Harrison]]'s ''[[The Stainless Steel Rat]] 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
* In ''A Tale Of Time City'' by [[Diana Wynne Jones]], 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
* [[Terry Pratchett]]'s ''[[Discworld]]'' novels:
**
{{quote|'''Lu-Tze:''' For a perfectly logical chain of reasons, Vimes ended back in time even ''looking'' rather like Keel! Eyepatch ''and'' scar! Is that [[Theory of Narrative Causality|Narrative Causality]], or [[Stable Time Loop|Historical Imperative]], or Just Plain Weird?}}
** Which is why if you try to place the times and events of some books, they take place a couple years before a different book, and at the same time, hundreds of years before the
** [[Word of God|sir Terry]] himself at one point explained that "There are ''no'' inconsistencies in the Discworld books; occasionally, however, there are alternate pasts."
* ''[[Animorphs]]'' made use of [[Time Travel]] occasionally, and each time it apparently worked differently. Though, perhaps in fairness, different techniques of [[Time Travel]] were involved, at least one of which was by use of a [[Time Machine|thingy]] created by the closest thing to a [[God]] in the series, and another (a [[Bad Future]]-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.}}
* Dean Koontz 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
* 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 [[Techno Babble]] about "intersecting universes" and the like) [[Voodoo Shark|just raises further questions]].
▲* James P. Hogan had a solution in ''Thrice Upon a Time''. The prospective time
* ''[[Black Hole High]]'': "Fate": When Vaughn, having traveled back in time to meet his mother, steals her
▲== Live Action TV ==
▲* ''[[Black Hole High]]'': "Fate": When Vaughn, having traveled back in time to meet his mother, steals her hairclip as a memento, [[For Want of a Nail|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|time travelers]], so without Pearson's wormhole (the basis for [[Time Travel]]), Josie shouldn't exist either.
* ''[[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, I'm quite sure the writers 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.
* ''[[Doctor Who]]'', again and again, to the point that they [[Trope Namer|named this trope]] in the course of [[Lampshade Hanging|lampshading]] it. Over the course of the show, nearly every theory of [[Time Travel]] has been used. How about "The Aztecs", where they explain that you can't really change history? Or "Day of the Daleks", where they find out the Daleks have conquered Earth in the future, and prevent it (using someone from the now-gone future, in fact)? Or in "Father's Day", where they create a [[Temporal Paradox]] and [[Clock Roaches]] start eating affected people? Let's not even get into all the [[Wayback Trip
** When the 10th and 5th Doctors meet up during a Children in Need Special "Time Crash" the 10th is in shocked disbelief to be seeing his former self, then goes on to use memories he picked up as the 5th meeting his future self to defuse the situation. When the illogic of this is brought up (not to mention the violation of multi-doctor meet up [[Canon]] established from the other 3 times this has happened), ''both'' Doctors mumble something about "Timey
** It's actually mentioned in the old series of ''[[Doctor Who]]'' that the Time Lords deliberately took Gallifrey out of its own time to prevent any potential rogue Time Lord from ever altering Gallifrey's history. Then again it's also stated time and time again in the old series that Gallifrey can't be destroyed, and look what they did in the NA and the new series.
** In "The Fires of Pompeii", a companion asks why the Doctor will thwart aliens but not stop a particular historical catastrophe, and the Doctor replies that some points in time are fixed, while others are in flux. His being a Time Lord allows him to perceive which is which, and act accordingly; even against his nobler instincts.
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** The [[Trope Namer|Trope Naming]] episode, ''Blink'', actually involves a mostly-internally-consistent [[Stable Time Loop]]. It's the show as a ''whole'' that fulfills the trope by being inconsistent.
** The whole of ''The Big Bang'' is built on this trope {{spoiler|-- The Doctor saving the day and escaping from the Pandorica is built on an ontological paradox -- he shows up already escaped to enlist Auton!Rory in effecting his escape.}} The Doctor even explains that this would normally cause drastic side effects for the universe, but luckily {{spoiler|the universe had already been destroyed.}}
** ''A Christmas Carol'' also features this heavily. {{spoiler|It starts with the Doctor showing a video Karzan made as a boy to the older him - and traveling back in time to when he made it, leaving Karzan watching a video of the Doctor interfering in his past as his own memories change to reflect that this had happened. It ends with the Doctor showing the [[Future Me Scares Me|younger Karzan the man he turns into]], leading to the older one having a change of heart partly brought on by realizing he's turned into his father, and partly by him being retroactively altered by the experience of being horrified at seeing his older self as a boy.}} ''Ow.'' It's implied this method is far from perfect, as {{spoiler|Karzan's own mind-reading controls no longer recognizes him, despite the fact that it should logically have been programmed for the Karzan that existed in the current timeline.}} I think it's that the Doctor {{spoiler|changed the boy as well as the man. Hypothetically, Boy Karzan went through all the stuff that Scrooge Karzan did, but had the additional factor of seeing Scrooge Karzan and never wanted to become like he was.}} Presto Change-O and immediate echoes into the future... {{spoiler|his brain waves change - creating a new Karzan who both experienced Abigail ''and'' Scrooge Karzan and ''also'' maybe even at one point of the new history we didn't see ''rejected his father'' (so no actual mind control for him was made .}} Who knows? It is a
** River Song. Her encounters with the Doctor are not synchronized at all, and it's not even clear how events follow in canon. The journal checking seen in "[[Doctor Who/Recap/
*** Simple enough: Their meetings are mostly random, and any given time the two meet up may be synchronized, but -overall- they're moving in opposite directions.
** To add to the weirdness that is time-travel in ''[[Doctor Who]]'', look at its opinion on the Blinoctich Limitation Effect. In some cases it seems to suggest that [[Never the Selves Shall Meet]], lest they cause reality to shatter. Or maybe that's only if there's another paradox nearby. Sometimes it causes memory loss if the two touch, like what happened to [[The Brigadier]]. Maybe the same object touching will just cause sparks. Or maybe nothing will happen at all except flirting. It's just whatever happens to work for the plot.
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** 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 Ghosts
* ''[[The Girl From Tomorrow]]'' 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 [[Delayed Ripple Effect]]. 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 [[Delayed Ripple Effect]], 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 [[Portal to the Past]] 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 [[Stable Time Loop]]}}
* ''[[Heroes (TV series)|Heroes]]'' can't decide if they are going for Static Time
** 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, this is both [[Fridge Logic]] ''and'' [[Awesome but Practical]]; in the Heroes-verse, time has '''[[wikipedia:Torsion (mechanics)|torsion!]]''' This means that one can [[Set Right What Once Went Wrong]] only with "leverage"; only the passage of sufficient time permits time to be altered, thus preventing [[Seers]] and [[Time Travel]] from being a [[Deus Ex Machina]]!
*** 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 [[You Can't Fight Fate]]. 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.
***
* ''[[Kamen Rider Den-O]]'' spikes the Timey-Wimey Ball like no other: when an [[Monster of the Week|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 [[No Ontological Inertia|Ontological Inertia]] fails [[San Dimas Time|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
** At one point, {{spoiler|Ryotarou's memory rebuilding the ''entire timeline'' after his sister and her husband deliberately break it in order to force their unborn daughter out of the timeline (long story). But wait, what about when Yuuto disappeared and Hana stated that Ryotarou's memory wouldn't be enough to bring him back because Ryotarou didn't know him as a young teen? Then... what about all the people Ryotarou didn't know or remember in the ''present'' time? What happened to them?!}}
*** It was explained in the "Piano man" story arc that {{spoiler|they get displaced from time and ride the den-liner until they're remembered [[Finagle's Law|IF they're remembered.]] }}
** In the crossover movie
*** The original ''[[Kamen Rider (TV series)|Kamen Rider]]'' 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
** In the same film, Kotaro explained that the only reason that OOO was unaffected by the changes in history is that he had been in close contact with a singularity point. That ''completely'' doesn't match how things have worked before (Ryotaro is a Singularity Point, hence ''being able to be Den-O,'' and it sure didn't protect his supporting cast from the Timey Wimey Ball.) Of course, by this point, Den-O's movies are not unused to [[Plot Hole|plot holes]]. When it comes to how time works in Den-O, the [[MST3K Mantra]] would seem to apply.
* The ''[[Stargate SG-1]]'' episode "1969" dealt with a [[Stable Time Loop]]. 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.
** ''[[Stargate Atlantis]]'' had two episodes in the vein of "2010" and "Moebius", following pretty much the exact same conventions in both.
** ''[[Stargate Universe]]'' 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
* ''[[Star Trek:
** It's possible the Prophets never changed, though. The viewers see Sisko changing them, but since the Prophets have no concept of time, they're kind of impossible to change (except when the plot requires, of course). To everyone else they have always acted like gods. It's like a massive [[Reset Button]], only we never see what happened before the reset. The events of the series cause the prophets to act the way they do... which cause the events of the series. [[Stable Time Loop]].
*** The whole thing gets kind of [[Lampshade Hanging|lampshaded]], when two versions of O'Brien try to figure out the paradoxes and give it up, simultaneously saying, "I ''hate'' temporal mechanics!"
** The enormous effect the resulting lack of religion would have on Bajor would have been good or Bajor. No Cardassian invasion, no holocaust. Alternate Bareil says his Bajor has no religion. Alt-Bajor is a high ranking member of the Empire.
* ''[[Star Trek:
** The Sphere Builders ''misled'' the Xindi into believing that humanity destroyed ”or rather, ''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.
* ''[[Star Trek:
** 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 [[Handwaved]] 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 [[Temporal Paradox]] 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 [[The Federation]], at least according to Voyager's writers, prefers the latter.
*** And even worse, the guy's future self was only mentally unstable ''because'' said [[Time Police]] 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...
** ''[[Deep Space Nine
*** This episode also involves a ''literal''
** ''[[Star Trek:
*** They didn't just stop trying; Janeway stopped their attempt by firing her phaser into the time-portal technobabble thingy. [[Percussive Maintenance|So time reverted to normal]]. Or something.
** Also, no list of Star Trek [[Buffy-Speak|timey-whatever-things]]... is complete without mentioning
*** A quote from Jonathan Frakes re:
*** This one isn't all that hard as far as paradoxes go. During the Battle of Khitomer, the Enterprise-C made a [[Heroic Sacrifice]] against the Romulans attacking the Klingon outpost. This selfless act by a Federation ship on behalf of the Klingon Empire eventually led to a peace treaty between the Klingons and the Federation. However, during the battle, a massive explosion caused a [[Negative Space Wedgie]] 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, so once the Enterprise-C arrives in the present, the present almost immediately becomes a [[Bad Future]] where the Federation and Klingon Empire have been at war for decades. 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, who in the [[Bad Future]] survived when she died in the "normal" timeline, volunteers to go back with the -C after being told by Guinan that she would not live when things go back to normal. So the Enterprise-C goes back to the Battle of Khitomer and is destroyed, but the results of the battle are changed just enough that captives are taken by the Romulans, including Tasha. So all in all, a bit more difficult to follow, but not all that hard to understand.
** ''[[Star Trek (film)|Star Trek]]'' is even more disturbing: since it erased the later series from continuity, every time cast from the later series
*** [[Word of God]] has it that instead of erasing the later series, it just [[Alternate Universe|split off a new timeline]], so that the later series still happened in the original timeline but have not in the new timeline. Either way, ''Enterprise'' is still canon.
*** Alternately, the events of ''[[Star Trek:
**** The problem with that interpretation is that the 2063 events from ''First Contact'' are established as taking place in the prime timeline (Seven mentions the Borg being present during the flight of the ''Phoenix'' in "Year of Hell".)
* While each ''[[Terminator]]'' movie managed to be internally consistent, ''[[The Sarah Connor Chronicles]]'' 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.
* ''[[Quantum Leap]]'': 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.
* ''[[Timeslip]]'', a 1970s British series, presented a form of time travel where the past, not "really" being able to "happen again" is "fixed"
* Many descriptions of ''[[Sapphire and Steel]]'' imply it's a [[Time Police]] show. Instead, it uses time travel - and the rules thereto - like a [[Cop Show]] uses criminal procedure: arbitrarily.
* ''[[Seven Days]]''. 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 (And yes, 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 [[Evil Twin|evil version]]. The good version is killed, so the evil version is sent back in time ''again'', creating another ''good'' version.
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** And later in that same episode, The Boys From the Dwarf violate the same laws that allowed them to survive after they take [[John F. Kennedy]] back in time to assassinate his past self!
** In "Future Echoes", Rimmer tries to explain Timey Wimey to Lister:
{{quote|'''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, [[Funetik Aksent|hactually.]]
'''Rimmer:''' Poppycock! [[Time Travel Tense Trouble|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. }}
* ''[[Smallville]]'' had a situation in the episode "Homecoming" that was similar to the ''[[Doctor Who]]'' "Time Crash" short mentioned above; Clark, briefly stuck seven years or so into the future courtesy of Brainiac 5, slips into the Daily Planet's elevator, where [[My Future Self and Me|his older self is waiting for him.]] Older Clark orders younger Clark to go to the Planet building's roof to prevent Lois' helicopter from crashing while he (the older Clark) prevents a nuclear reactor from melting down as Superman. When younger Clark asks his older self how he knew to wait for him, older Clark simply answers, "Time travel. Work it through." He knew because he had lived the same situation seven years ago.
* ''[[Supernatural (TV 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. "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
== Tabletop Games ==
▲* In ''Time Agent'', your objective is not to win. Your objective is to have already won... without Time Travel being invented. [[Mind Screw|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.
▲* In ''[[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 [[Time Crash|destroy the universe]].
▲* There's a ''[[Back to The Future]]'' 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?
== Video Games ==
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* Completely [[Averted Trope|averted]] in the upcoming indie RTS ''[[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 [[Grandfather Paradox|time paradoxes]]... in competitive multiplayer. Bonus points for the system still managing to be fairly easy to learn.
* While ''[[Chrono Trigger]]'' was generally consistent about how its time travel worked, there were a few odd instances. Like how Marle [[Temporal Paradox|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.
** The
*** This also means that it is possible to beat the [[Bonus Dungeon|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.
** ''[[Chrono Cross]]'' tries to patch things up by using [[Hand Wave|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 [[Time Crash]] (wherein a time experiment pulled a city borne from the "good" future into the "bad" future, thereby destroying it, after which it froze and was pulled back to the game's present when the laboratory conducting the experiment, and its opposite number from ''another'' alternate reality, were ripped from their native timelines.)
* ''[[Legacy of Kain]].'' Time-travel, paradoxes, [[Decoy Getaway
* The ending of ''[[The Legend of Zelda:
** 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, [[Stable Time Loop|
*** The "creation" of the Song Of Storms out of thin void is what [[The Other Wiki]] describes as an Ontological Paradox. A very common hazard of [[Stable Time Loop
** ''[[The Legend of Zelda: Majora's
** ''[[The Legend of Zelda: Oracle of Seasons and Oracle of Ages|Oracle Of Ages]]'' has [[Stable Time Loop
{{quote|''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'' 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.}}
** ''[[The Legend of Zelda:
* ''[[Mario & Luigi: Partners In Time]]''. This was [[Lampshade Hanging|lampshaded]] at one point, where doing something in the past gives E. Gadd an idea in the present, and he notes how paradoxical it is.
* ''Original War.''
* The recent ''[[Prince of Persia]]'' trilogy is one massive example of timey-wimey craziness. At the end of ''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 creates a paradox, and in ''Warrior Within'' the Prince is being chased by the Dahaka, a timeline guardian who is trying to ensure that the timeline proceeds as it was meant to. The Prince inadvertently creates a [[Stable Time Loop]] when he {{spoiler|kills Kaileena and creates the Sands of Time, the very thing that he was traveling back in time to prevent.}} 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.}} At the end of the second game, {{spoiler|he has killed the Dahaka and successfully prevented the Sands of Time from ever being created}}, causing another disruption of the true timeline. In ''The Two Thrones'', the Prince discovers that his paradoxical actions in Sands of Time 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 a all his futile time-travel, as he leaves the end of the game be with no further meddling.
** The opening line of the game:
{{quote|'''The Prince:''' Most people think time is like a river that flows swift and sure in one direction. But I have seen the face of time, and I can tell you, ''they are wrong.''
* Episode 204 of ''[[Sam and Max]]'', Chariot of the Dogs, focuses on Time Travel. Within it, 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,
** But then, this is Sam and Max, and it stands to reason that any time travel plot
* Episode 204 is merely the [[Spiritual Successor]] to ''[[Day of the Tentacle]]'', which is also extremely wibbly-wobbly timey-wimey. The game runs on [[San Dimas Time]] 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 [[Big Bad]] to become evil,}} thus causing a huge paradox and defeating the point of them even disembarking on their adventure in the first place. But [[Rule of Funny|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. Obviously, he didn't care about any potential paradoxes, since the plan would create a big one. Then again, he
* The game ''[[Second Sight]]'' seems to be this. 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 [[Mind Screw]]. {{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.
* The recent DS point-and-click adventure game ''[[Time Hollow]]'' 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.
** Although 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,
* ''Timesplitters'' on the Gamecube and whatnot relied on [[Stable Time Loop
** And then in the games 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.
* ''[[Tactics Ogre]]'', 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
* ''[[World of Warcraft]]'' 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
** And then there is the novel trilogy ''War of the Ancients''. Despite some dramatic changes (such as saving an entire race that originally went extinct), its 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 ''[[World of Warcraft]]'' after having been said to be extinct in an earlier novel...
** 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 [[Retcon|Ret Conned]]. 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.
* ''Command & Conquer - Red Alert'' series - seriously, the series by now has something in the range of 2
** Add to that the events of ''Yuri's Revenge'' when 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. Also two Tanyas and two Lieutenant Evas.
* One puzzle in ''[[Escape from Monkey Island]]'' 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 [[Stable Time Loop]].
** "I guess you ''are'' more likely to shoot yourself." Cue the [[Swirly Energy Thingy]].
* ''[[Sonic the Hedgehog (2006
* A Timey
** Some people believe that the proper play-through is first game: bad ending, second game: good ending, first game: good ending. It helps if you prefer the many-worlds explanation of time travel. This has a benefit of {{spoiler|explaining Anne's Cross.}} Yes, it {{spoiler|goes through a time loop}}, but it's only a single (open-ended) one. Others wonder why {{spoiler|Anne's Cross}} doesn't get more battered with every loop, apparently thinking there's a stable time loop going on.
* The activation of the god-golem Numidium in the conclusion of ''
** 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.
* ''[[Dragon Quest V]]'' has a literal
** ''[[Dragon Quest VII]]'' takes it [[Up to Eleven]] 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.
* ''[[Apollo Justice: Ace Attorney]]'' 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
* ''
* ''[[Back to The Future]]: 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 De Lorean once they land in 1985.}} To make matters even more confusing, {{spoiler|the De Lorean doesn't disappear even though the time machine was never created.}}
** {{spoiler|That particular De Lorean actually did start to disappear once Marty managed to get the 1931 timeline mostly straightened out, but only after another Doc Brown
* ''[[Radiant Historia]]'' is all about using this trope, [[Tricked-Out Time]], and most other [[Time Travel Tropes]] in a quest to ensure the [[Golden Ending]].
==
* In ''[[Bob and George]]'' 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 [[Stable Time Loop]] 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
** 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}}.
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* Trying to track the [[Ret-Gone|timeline changes]] in ''[[Misfile]]'' may lead to you repeating this trope name [[Madness Mantra|over and over and over again]]. Just [[Take Our Word for It]].
* ''[[Narbonic]]'' 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
* ''[[Minions At Work]]:'' [http://www.minionsatwork.com/2009/02/minions-152-working-overtime.html Pretend it never happened].
* There don't seem to be any concrete rules to ''[[Sluggy Freelance]]'' [[Time Travel]]. Possibly [[Justified Trope|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 [[Rule of Fun|fun]] way.
** In a more recent strip, Old-Riff says that [[Time Travel]] follows the branching timeline rules, and therefore you can't change the past, you're just abandoning the [[Bad Future]] 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.
* Time travel in ''[[Irregular Webcomic]]'' at first ''appears'' to work in a [[Stable Time Loop]] fashion, but then it's revealed that {{spoiler|It's possible to "break" a [[Stable Time Loop]], an action capable of ''destroying the entire universe.'' [[Oh Crap|Several time loops have already been broken]].}}
** And now {{spoiler|Every universe, save the "espionage" theme universe, has been destroyed. They got better.}}
*** [[Running Gag|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.
* [http://www.mspaintadventures.com/?s=6&p=003151 This page] of the Midnight Crew intermission in ''[[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 [[Time Travel]] shenanigans. And even ''[[Time Master|he]]'' doesn't understand all the mechanisms behind it, his advice to the other characters (and the audience) is just basically [[Bellisario's Maxim|"Don't overthink it."]]
{{quote|'''Dave:''' see the thing with time travel is
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** However, [[Magic A Is Magic A]] 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) [[You Already Changed the Past]]. 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 [[Time Travel]]. 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 [[Doctor Who/Recap/
* Done [[So Bad It's Good|hilariously badly]] in the abandoned indy RPG ''[[Zybourne Clock]]'':
{{quote|[[Memetic Mutation|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.}}
* The characters of ''[[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 [[Department of Redundancy Department|going back in time to stop themselves from going back in time to stop themselves from going back in time]]. The moral of the story is: don't mess with time travel or your [[Earthshattering Kaboom|universe will implode]].
* This is probably gonna be the only way to understand the whole time traveling bit in ''[[Sonichu]]''. To wit, [[Author Avatar]] Chris is launched into the future where he is able to help those in the future [[Cure Your Gays|make the vaccine for homosexuality]] ([[Did Not Do the Research|even if that's not how it works]]) before being able to convince his future wife Lovely Weather he is is 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
**
== Web Original ==
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** 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.}}
* The ''[[Terminator]]'' variety is spoofed in the ''[[Atop the Fourth Wall]]'', where time travel doesn't work on pants.
== Western Animation ==
* There's a gigantic lampshade in ''[[Tripping the Rift]]''. 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 the double-episode "Two futures" of ''[[Captain Planet and the Planeteers]]'', Wheeler uses a time pool to go back and prevent himself from receiving the fire ring. This results in a [[Crapsack World|crapsack future]] because the Planeteers never became a team and saved the environment (though why they [[Fridge Logic|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. Never understood that bit, myself. To make sure the viewers knew things were restored to normal, a scene from the utopian future is shown at the very end.
* The ''[[Kim Possible]]'' movie ''A Sitch in Time'' begins with Kim and Ron splitting up, [[Chickification|causing Kim to become worthless in fighting evil]] thus the [[Super Villain
{{quote|''"Time travel, it's a cornucopia of disturbing concepts."''}}
* The plot of a ''[[Pinky and The Brain]]'' 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 [[Overly Long Gag|Brain Brain Brain]]."
* [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 [[Stephen Colbert]]'s show, illustrates how bad (or ''[[So Bad It's Good|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. [[Overly Long Gag|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?
* In ''[[Transformers Armada]]'', 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|1=inside Unicron. Rad then touches High Wire's hand and frees him (and by
** Not to mention, 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.}}
* One of the first episodes of ''[[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 Stormy and Quinn capture future Stormy and Quinn and lock them up in the gym while they're gone, where they remain when the next pair causes the rift. 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 gym is filled with them, each pair a slightly malformed copy of the previous pair. Eventually, {{spoiler|it takes all the Quinns working together to figure out a solution to the growing problem, and all the Stormies play dodgeball. Also, Stormy having a communicator watch.}}
* ''[[Danny Phantom]]'' has Clockwork and then the Infinite Map for time travel.
* In ''[[Futurama]]'', time travel results in the creation of [[Stable Time Loop
** Then there's Professor Farnsworth's time machine in "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?
*** [[Flat What|What?]]
* Time travel in ''[[The Fairly
** The problem with the "Crocker wouldn't have become obsessed with Fairies" outcome rings hollow when, watching the Secret Origin episode again, the viewer sees that Cosmo was the one who wound up getting Crocker's childhood screwed up...
*** Then again, if Timmy wasn't present to wish what had caused Crocker such misery, Cosmo likely wouldn't have had the opportunity to travel back in time and screw up Crocker's childhood.
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* ''[[The Penguins of Madagascar]]'' 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.
* In an episode of ''[[South Park]]'', 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.
== Real Life ==
* There are a few people hanging around who've
** The Kelly brothers have this literally, since they are ''both'' astronauts. Captain Mark Kelly is slightly older than his brother Captain Scott Kelly, since he has spent 54 days in space as compared to 180 days. But the difference in their ages is only ''about a ten-thousandth of a second''.
** General Relativity adds a whole new layer of complexity to the whole spacetime thing. For example spacetime gets really warped close to extremely compact objects. It becomes several orders of magnitude more complex when there is more than one such object. Put two black holes in close proximity and even top astrophysicists will struggle. (And the math shows that spacetime does indeed behave in strange ways in such situations, such as loops forming around the black holes such that you could travel to your own past.)
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**** If only! The Gödel metric manages to have closed timelike loops in a universe that has ''no singularities'' and is even topologically ''simply connected''. No, I cannot visualize that either.
* [http://reason.com/blog/2009/10/14/they-say-you-cant-fight-the-fu The Higgs-Boson, according to some people.]
* [[wikipedia:Git (software)|Git]]. Git is a version control system. Like all version control systems, Git allows you to store files in time: essentially, taking a snapshot of a directory at a particular point and allowing you to roll back to it. Like any VCS, it can store many such snapshots. And, as with many VCS schemes, you can go backwards in time and start a new branch of changes relative to that particular time. With most VCS schemes, history can be branched, and created, but never modified or destroyed. Not so in Git, which allows you to go back in time and ''change'' what used to be there, rewriting past changes. What happens in the future, when changes have been made based on those previous changes? You get the Timey
** Fortunately, Git preserves even changes to history (perhaps in a form of [[San Dimas Time]]), so you can revert your edits to history.
*** Unfortunately, unlike saner
**** Yeah, git filter-branch is fun times in a large organization. It takes a while to get settled back into one timeline. Let's just note that Linus named git [[Self-Deprecation|after himself]].
{{reflist}}
[[Category:Time Travel Tropes]]
[[Category:Consistency]]
[[Category:This Index Is Not an Example]]
▲[[Category:Timey-Wimey Ball]]
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