Back to the Future is a 1985 American science fiction comedy film. It was directed by Robert Zemeckis, written by Zemeckis and Bob Gale, produced by Steven Spielberg, and stars Michael J. Fox, Christopher Lloyd, Lea Thompson, Crispin Glover and Thomas F. Wilson. Fox plays Marty McFly, a teenager who is accidentally sent back in time to 1955. He meets his future parents in high school and accidentally attracts his mother''s romantic interest. Marty must repair the damage to history by causing his parents-to-be to fall in love, and with the help of scientist Dr. Emmett "Doc" Brown, he must find a way to return to 1985.
Zemeckis and Gale wrote the script after Gale mused upon whether he would have befriended his father if they attended school together. Various film studios rejected the script until the financial success of Zemeckis'' Romancing the Stone. Zemeckis approached Spielberg and the project was planned to be financed and released through Universal Pictures.
The first choice for the role of Marty McFly was Michael J. Fox. He was busy filming his TV series Family Ties and the show''s producers would not allow him to star in the film. Consequently, Eric Stoltz was cast in the role. During filming, Stoltz and the filmmakers decided that the role was miscast, and Fox was again approached for the part. Now with more flexibility in his schedule and the blessing of his show''s producers, Fox managed to work out a timetable in which he could give enough time and commitment to both.