Seventeen year old Marty McFly (Michael J. Fox) is always in trouble at school. His parents are not happy with him. He wonders if THEY were ever teenagers? It so happens Marty’s eccentric friend, Dr. Emmett Brown (Christopher Lloyd), has invented a time machine from a jiggered DeLorean. The accidental adventures Marty has in the DeLorean let him see his parents as teenagers, but at the risk of changing their lives and wiping out his own existence!