Fox was one of the biggest stars on television. His world was about to get even bigger, but only if he could survive the kind of double duty unheard of in Hollywood. Fox’s days were already dedicated to rehearsing and taping the hit sitcom Family Ties, but then the chance of a lifetime came his way. Soon, he committed his nights to a new time-travel adventure film being directed by Robert Zemeckis and produced by Steven Spielberg—Back to the Future. Sitcom during the day, movie at night—day after day, for months.