- - The grandfather paradox implies that it's impossible
- - Solution for someone who's stuck in the past?
- - 'Back to the Future' subject
- - Not live in the present?
- - Basis of the Doctor's adventures on 'Doctor Who'
- - "Back to the Future" feature
- - Revisiting the past?
- - "Back to the Future" theme
- - Cause of some paradoxes in science fiction
- - "Lost" motif
- - Move to a later date, say
- - Going back, in a way
- - Sci-fi odyssey for a New York player
- - Experience for Marty McFly
- - "Doctor Who" subject
- - Make history, in a way
- - Sci-fi premise
- - Sci-fi subject
- - Subject of an H.G. Wells novel
- - Familiar science-fiction theme.
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