When eighties teenager Marty McFly is accidentally sent back to 1955, he finds himself entangled with one of his teenage mother's closest friends, forcing him to make some extremely difficult choices along the way as he attempts to get his parents together before he fades out of existence, all the while working with Doc to try and make it back to 1985. Set alongside the events of Back to the Future (1985) during Marty's week spent in 1955.