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Wrong Time Travel Savvy (view source)

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{{trope}}
{{quote|'''Martha Jones:''' But are we safe? I mean, can we move around and stuff?<br />
'''The Doctor:''' Of course we can. Why not?<br />
'''Martha Jones:''' It's like [[You Watch Too Much X|in those films]]: [[Butterfly of Doom|If you step on a butterfly, you change the future of the human race.]]<br />
'''The Doctor:''' Then, don't step on any butterflies. [[Comically Missing the Point|What have butterflies ever done to you?]]|''[[Doctor Who (TV)|Doctor Who]]'', "The Shakespeare Code"}}
 
A key element in a lot of stories with [[Time Travel]] is the character's knowledge, or lack thereof, of [[Temporal Mutability|how time travel works]]. Is the world [[You Already Changed the Past|deterministic]]? Is time [[Hitler's Time Travel Exemption Act|hard to change]], or [[Butterfly of Doom|way too easy]]? Is there [[Our Time Travel Is Different|something else weird going on]]? Will a [[Temporal Paradox]] destroy the universe, create an alternate one, or do you just risk being [[Stable Time Loop|very confused]]? Of course, if the series itself [[Timey-Wimey Ball|keeps changing the rules]] it's up to the writer at the time whether or not you are wrong.
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* One interpretation of ''[[Terminator Salvation]]'' (and the whole series) is that the characters are tragically wrong about the whole "no fate" thing.
** That doesn't fit with ''[[The Sarah Connor Chronicles]]'' (though [[Canon Dis ContinuityDiscontinuity|that's okay]]; T3/Salvation and SCC are [[Alternate Continuity|separate direct continuations from T2]].) Chronicles actually has {{spoiler|different time travelers bringing back knowledge of different futures, though all feature the Skynet War}}; evidently time ''can'' be changed, but it's got a hell of a lot of inertia.
** Arguably, in ''The Terminator'', Kyle and Skynet erroneously believe history can be changed. Then ''Terminator 2'' retcons it so that they're right.
* In the [[Star Trek (Filmfilm)|new]] ''[[Star Trek (Filmfilm)|Star Trek]]'' [[Star Trek (Filmfilm)|movie]], old Spock relies on Kirk's lack of knowledge about the mechanics of time travel in convincing Kirk not to reveal old Spock's existence to his past self.
* ''[[Twelve12 Monkeys]]'' starts with the main characters seeming to know how time travel works, but by the end it's a bit more ambiguous whether they do or not. This is probably because the main character starts to feel like he's losing his mind and possibly dreaming up the whole future nonsense in his own mind.
* The main characters of ''[[Primer]]'' start out by taking elaborate precautions to avoid changing the timeline too much. By the end of the movie, they've realized that they're in a branching universe-type situation where they can totally ignore these precautions. [[Time Travel Tense Trouble|By then, they've already spun the timeline wildly out of control]].
 
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* [[Larry Niven]]'s ''Get A Horse'' (and the other stories in the same series) features time travel based on the premise that, since time travel is impossible, if you travel back in time you actually enter a fantasy world. Thus, when the hero goes back in time to bring back a horse, he finds a unicorn. When he goes back to bring back a whale, he finds Moby Dick, and so on. No one in the series ever figures out that they aren't visiting the past, but rather are visiting fiction.
** Svetz, the hero of the Larry Niven time travel series, also finds a werewolf when he is after a dog, and finds a Roc chick when going after an ostrich.
** In ''Rainbow Mars'', the pattern continues, as the ancient Mars the characters visit contains elements from fictional Marses created by [[Edgar Rice Burroughs]], [[Ray Bradbury]], [[HGH. G. Wells]] and others.
* Alfred Bester's ''The Men Who Murdered Mohammed'' plays around with this. A scientist attempts to erase his wife out of existence after he finds her cheating on him. He whips up a time machine, and goes back in time to kill her grandfather. {{spoiler|The catch? It doesn't work. So, he works bigger, rampaging through time, killing more and more famous people (hence the title, as even when he murders the founder of a major world religion nothing changes) with absolutely no effect on the present until, finally, he meets a fellow time traveler who explains that the past he's killing is his own, and he's unhinged himself from reality because of his actions}}.
* ''The Time Ships'' by [[Stephen Baxter]] is a sequel to [[HGH. G. Wells]]' ''[[The Time Machine]],'' detailing the Time Traveler's adventures after he vanishes at the end of the first book. He's heading back to the future to rescue Weena (a rare instance of [[Set Right What Once Went Wrong]] in which the "once" is in the future, though in his personal past), but finds the future [[Butterfly Effect|radically changed]] because his story was published as a novel, preventing the [[Bad Future]] of Eloi and Morlocks. After learning this he [[Lampshade Hanging|muses dismally]] about how he'd expected history to be like a room he could move through while it remained basically unchanged.
* In [[Dinoverse (Literature)|Dinoverse]] this once comes up. Four children have accidentally had their minds converted into "pure thought-energy brainwaves" and sent to the Cretaceous into the bodies of large prehistoric reptiles; as they're orienting themselves and wondering what happened, they get a message from the distant future, from sixty years ''after'' the accident. The message claims that they've been comatose for all sixty years but then posits a way they might get back and to an instant after the accident. The characters worry about this off and on, wondering if it means they've already failed, or if there's some paradox making it possible, or if they'll be dictating that message in the future.
* [[Connie Willis]]' works, particularly [[To Say Nothing of the Dog]] and [[Blackout]]. The protagonists spend a lot of time worrying about [[The Butterfly Effect]] and have a fairly well-developed theory of [[Rubber Band History]]... but in every case it seems to work out as [[You Already Changed the Past]].
 
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** Faraday attempts to change the past, and apparently manages it once with Desmond, and Desmond apparently does change the past a few times...but both of them just coincidentally manage to have 'swiss cheese memories', the existence of which can be linked to their time travel, so smart money said [[You Already Changed the Past|they already changed the past]] the whole time, and the way causality protects itself on Lost is to simply make people remember things wrong, or not at all, if the memories would cause a paradox.
* In ''[[Life On Mars]]'' and ''[[Ashes to Ashes]]'', both protagonists [[Set Right What Once Went Wrong|attempt to change history]], but fail despite their best efforts, leading them to draw the conclusion that the past cannot be changed. They also meet close relations and have close encounters with, but deliberately avoid actually meeting themselves. Then suddenly in series 2 of [[Ashes to Ashes|A2A]] it all goes to hell when the [[Big Bad]] {{spoiler|shoots his younger self in the face and frames Alex for the murder}}. [[Never the Selves Shall Meet]] [[Subverted Trope|indeed]].
* In the [[Stargate SG -1]] episode ''1969'', Carter spends most of the episode telling the rest of the team they have to be careful not to change the past. Yet she doesn't seem to realize that Hammond's handing them the note before they left pretty much proves they're in a [[Stable Time Loop]]. But this fits with Carter's regular habit of introducing unnecessary complications into other people's plans just because the writers think it makes her look smarter.
 
== Webcomics ==
 
* Subverted in ''[[Homestuck (Webcomic)|Homestuck]]''. Dave has no idea how his time traveling powers work and doesn't plan on changing that.
* Appears briefly in ''[[Schlock Mercenary (Webcomic)|Schlock Mercenary]]'' when time travel suddenly becomes possible. Kevin resolves the matter [http://www.schlockmercenary.com/2005-04-03 experimentally], genuinely frightening Petey, the local [[Physical God]].
 
 
== Western Animation ==
 
* ''[[Wakfu (Animation)|Wakfu]]'' gives us {{spoiler|Nox}}, whose goal is to [[Set Right What Once Went Wrong]]. {{spoiler|[[Alas, Poor Villain|Unfortunately for him]], time travel within the World of Twelve not only consumes ridiculous amounts of power, it quite possibly tears holes in the universe as well.}}
* Dinobot in ''[[Beast Wars (Animation)|Beast Wars]]'' fears that [[You Already Changed the Past]] is in effect, rendering all of his choices meaningless. Then Megatron proves that you ''can'' change the past and watch the future change with it, which drives the plot from that point on.
* In the episode "Paraducks", Gosalyn advises [[Darkwing Duck]] to not interfere when they get sent back in time to his childhood. Back to the present, and the city's held in the grip of a crime lord. Turns out they were in the middle of a [[Stable Time Loop]] instead..
 
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