THX 1138 is a 1971 American social science fiction film co-written and directed by George Lucas in his feature directorial debut. Produced by Francis Ford Coppola and co-written by Walter Murch, the film stars Robert Duvall and Donald Pleasence, with Don Pedro Colley, Maggie McOmie, and Ian Wolfe in supporting roles. The film is set in a dystopian future in which the citizens are controlled by android police and mandatory use of drugs that suppress emotions.