The 1971 AD movie THX 1138 was directed by George Lucas and stars Robert Duvall as THX, Donald Pleasence as SEN, Don Pedro Colley as SRT, Maggie McOmie as LUH, Ian Wolfe as PTO, et al.
(note: there is some nudity in the original movie; such as Robert Duvall’s man-butt so…)
The movie is based on a short, 15 minute, 1967 AD film also by Lucas titled Electronic Labyrinth: THX 1138 4EB.