Questions tagged [paradox]

A paradox is a seemingly true statement or group of statements that lead to a contradiction or a situation which seems to defy logic or intuition. For the short-lived UK sci-fi series, use the tag [paradox-tv], and for the 2010 film staring Kevin Sorbo and Christopher Judge, use the tag [paradox-movie]

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Why can't the Doctor visit a particular point in his timeline to return to Gallifrey (at least temporarily)? [duplicate]

We already know the Doctor never follows the rules of space-time, so why is Gallifrey inaccessible? Shouldn't he be able to, you know, travel to a point in his past when Gallifrey still existed in ...
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Isn't ending of Terminator 2:Judgement day a time paradox?

I have just started watching the Terminator franchise and finished till 2. But its ending had my mind boggling. If Skynet and Terminator, both are created by Cyberdyne, using the microprocessor that ...
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539 views

Is there a way to bypass the paradox system with a Time Turner in Harry Potter?

Is it possible to not create a paradox by using a Time Turner to stop someone (e.g Voldemort) from the past? For example, a theory could be that somebody would go back in time by 3 hours, poison ...
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Does “Star Wars” still exist in “Back to the Future”? [duplicate]

In Back to the Future, when Marty goes back to 1955, he scares his dad by saying he’s “Darth Vader from Vulcan”. Obviously Darth Vader didn’t exist in 1955 as Star Wars didn’t come out for another ...
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When Marty travels back to the future, why are not there two of him in 1985? Or they indeed are? [duplicate]

When Marty travels back to 1985 from 1955 at the end of the 1st BTTF movie (and meets his all new present), aren't there two Marties in that moment (the one that has just arrived and the one that was ...
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2answers
313 views

What kind of paradox is this? [duplicate]

I was wondering something regarding the Back To The Future movie: Marty McFly is on stage and he's playing Johnny B. Goode. Marvin Berry phones his cousin Chuck Berry (the person who wrote the song). ...
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1answer
137 views

Did any universe address the problem of double DNA [closed]

When you mess up time travelling and become your own ancestor, there is a big problem: At some point in time, a child will be born with exactly the same DNA as you. Did any franchise address this ...
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Doctor Who time paradox Captain Jack [closed]

Jack is the face of Boe and has lived for millions (or billions) of years; The Doctor has called him a fixed point in time and space. In the short of 'time crash' the paradox of meeting himself and ...
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Why did future John Connor bother to send the T-101 Terminator back?

In the movie Terminator 2: Judgement Day, future John Connor sends the Terminator back in time to save himself from being killed. But from the perspective of past John Connor (the kid), he sees a ...