THX 1138 is a 1971 American social science fiction film co-written and directed by George Lucas in his 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.

Plot

In the dystopian future, sexual intercourse and reproduction are prohibited, and mind-altering drugs are mandatory to enforce compliance among the citizens and to ensure their ability to conduct dangerous and demanding tasks. Workers wear identical white uniforms and have shaven heads to emphasize uniformity, likewise with police androids who wear black and monks who are robed. Instead of names, people have designations with three arbitrary letters (referred to as the "prefix") and four digits, shown on an identity badge worn at all times.