Michael J. Fox stars as Marty McFly, a typical American teenager of the Eighties accidentally sent back to 1955 in a plutonium-powered DeLorean "time machine" invented by slightly mad scientist Doc Brown (Christopher Lloyd). During his often hysterical, always amazing trip back in time, Marty must make certain his teenage parents-to-be, Crispin Glover and Lea Thompson, meet and fall in love - so he can get back to the future. Back To The Future - Part 2 A visit by Marty and the Doc to the year 2015 seems to resolve a few problems with the future McFly family. When they return home, they discover someone has tampered with time and Hill Valley, 1985.