Marty McFly (Michael J. Fox) and Doc Brown (Christopher Lloyd) are on a new mission to save the future and the past. Picking up exactly where the previous film left off, Doc leads Marty into the 21st century to save his future son from a horrible mistake. But Marty makes a mistake of his own when he brings an almanac of sports game results back to the 20th century—allowing bully Biff Tannen to win big bets and become the richest, most powerful man in town. Marty and Doc must use the DeLorean to return to the events of the first film and set the timeline right again; if they fail, everyone’s future is in jeopardy—to say nothing of their present.