A concept frequently used as a plot device involving the manipulation of events by characters traveling through time.

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identify movie where army goes back in time to ww1 or ww2 era

My father and I were talking about this movie, we saw it a VERY long time ago. All I remember about it is, that the army(present day in the movies time) somehow either Bermuda Triangle or something, ...
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Time travel paradox in Futurama

In S7E3 "Decision 3012", a man from the future travels back in time to stop Nixon winning the election. Since he defeats Nixon, there is no need for him to return to his own time. He never does and ...