"Back to the Future" fans were in for a treat Wednesday night when the franchise's stars, Michael J. Fox and Christopher Lloyd – in character as Marty McFly and Doc Brown – "time-traveled" in their DeLorean to "Jimmy Kimmel Live" for an epic reunion.

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Another question was on Marty's mind: What happened to Biff, the villain "who became a rich, egomaniacal casino owner and ruined the world" in "Back to the Future II"?

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