Accompanied by Doc Brown (Christopher Lloyd), teenager Marty McFly (Michael J. Fox) must travel thirty years into the future (to the far-flung year of 2015!) to save his own children from going to jail.
Meanwhile, the aged Biff Tannen (Thomas F. Wilson) steals the Delorean time machine to return to the Fifties and make his younger self rich, creating an alternative 1985 timeline in which Marty’s father, George, has been murdered…