Directed in 1985 by Robert Zemeckis and starring Michael J Fox and Christopher Lloyd, the first of a trilogy of comedy adventure movies involving time-travel to different periods of a fictional Californian town.

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In Back to the Future Part II, how could old Biff have made it back to 2015?

In Back to the Future Part II, Doc picks up Marty in 1985 and takes him to 2015. Then old Biff realizes the Delorean is a time machine. Old Biff steals the Delorean and travels from 2015 to 1955 to ...
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Crossing your own timeline, changing the future - how does that work?

There are many movies and TV episodes in which a character "crosses his own timeline", sometimes even meeting his past or future self (e.g. The Day of the Doctor). Technically, I should say meeting ...