The year is 1985 and Marty McFly (Fox) is your everyday teenager, except for one problem. He is stuck in 1955. After his good friend Doc Emmett Brown (Lloyd) is gunned down, Marty ends up sending the DeLorean back twenty years into the past. Now, he must find the Doc and convince him that he is from the future, in order for the Doc to send him back to the future, but this is the least of Marty's problem. After accidentally getting in the way of the important meeting between his future mother (Thompson) and father (Glover), Marty must get them back together before he changes time forever, and destroys his own existence.