Michael J. Fox was the original candidate to play Marty, but he was already signed to star in the TV series "The Birth of a Family". The producer of the show Gary David Goldberg believed that Fox was crucial to the success of the series. And the other star of the show, Meredith Baxter, is on maternity leave, so he refused to let Fox play a role in Back to the Future. The film was originally scheduled to start shooting in May 1985, but it was not until the end of 1984 that the producers learned that Fox was not eligible for the film. Robert Zemigis then considered C. Thomas Howell and Eric Stoloz. The latter’s performance in "Mask" left a deep impression on the producers, so he decided to He came to play Marty. Due to the difficult casting process, the film's start date was repeatedly postponed.
Four weeks after the filming started, Zemigis discovered that Serik Stoloz was not suitable to play Marty. Although he and Spielberg knew that the remake would cost an additional $3 million, they decided to replace it.
In January 1985, Meredith Baxter returned to the team smoothly after giving birth, so Michael J. Fox had free time, and the producer met with producer Goodberg again, and finally got Fox to join, but the premise was It is necessary to guarantee the shooting of the TV series "The Birth of a Family".
After learning that John Lithgow could not star in the film, producer Neil Canton recommended Christopher Lloyd, who had collaborated with him in "Natural Eros". Lloyd was reluctant to play Dr. Brown at first. With the insistence of his wife, he changed his original intention after reading the script.
