Futureworld is a 1976 American science fiction thriller film directed by Richard T. Heffron and written by Mayo Simon and George Schenck. It is a sequel to the 1973 Michael Crichton film Westworld. The sequel starred Peter Fonda, Blythe Danner, Arthur Hill, Stuart Margolin, John Ryan, and Yul Brynner, who made a cameo appearance in a dream sequence.