There was a really cool Twilight Zone with Martin Landau who played a time traveler sent back in time to alter history-something about preventing the birth of a man who would start a world war or something.
Well, he gets to the man's grandmother and one thing leads to another and they both get into his time travelling spaceship where he'd planned on taking her to his future. But then, he starts to fade in and out and panic sets in.
When she wants to know what's happening, his reply is, to the effect: I changed the course of history....and...I....was...never...born...
And he disappears, leaving her alone in the time capsule.
Something to consider....
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