Marty McFly, a "modern" teen in 1980s America, befriends an eccentric scientist Doc who is working on a time machine. Among many failed inventions, the time machine actually works and transports Doc and Marty to the 1950s, just in time to interrupt an early romance between Marty’s own parents. Marty has to re-unite his parents, while outsmarting a bully named Biff, otherwise his parents may never get married and have Marty as a son.

AP/FILE
This 1985 file photo originally released by Universal Pictures shows Michael J. Fox as Marty McFly, left, and Christopher Lloyd as inventor Doctor Emmett Brown in a scene from the film, 'Back to the Future.'