Dr. Emmett "Doc" Brown (Christopher Lloyd) appears in 1985 in his time-traveling DeLorean and tells Marty McFly (Michael J. Fox) and his girlfriend Jennifer Parker (Elisabeth Shue) that something is wrong with their future children, and that Marty and Jennifer must come with him to the future to fix it. As the three of them leave in the time machine, they are accidentally witnessed by Biff Tannen (Thomas F. Wilson).