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

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Time loop paradox in The Flash

In season 1, episode 15 (Out of Time), we see a time loop in the end. Assuming the timeline when the episode started to be x, in the end, we get to timeline x+1. So, does Barry retain his ...
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Was the explanation of the Back to the Future 2 timeline correct?

In the S08E05 of The Big Bang Theory, Leonard and Howard argue about the timeline of Back to the Future Part II. They talk about how the future Biff would go to a different future once he gives the ...
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How did the first loop begin in Triangle?

How did the first loop begin in Triangle? One Jess is killed in the car crash. Why doesn't she move forward to the loop?