People in the future live in a totalitarian society. A technician named THX 1138 lives a mundane life between work and taking a controlled consumption of drugs that the government uses to make puppets out of people. As THX is without drugs for the first time he has feelings for a woman and they start a secret relationship.

The Making of feature for the George Lucas movie 'THX 1138'.

In an underground city in a dystopian future, the protagonist, whose name is "THX 1138 4EB", is shown running through passageways and enclosed spaces. It is soon discovered that THX is escaping his community. The government uses computers and cameras to track down THX and attempt to stop him; however, they fail. He escapes by breaking through a door and runs off into the sunset. The government sends their condolences to YYO 7117, THX's mate, claiming that THX has destroyed himself. Electronic Labyrinth: THX-1138 4EB is a 1967 science fiction short film written and directed by George Lucas while he attended the University of Southern California's film school.

The film features a conversation between Lucas and Francis Ford Coppola, producer of THX 1138. They discuss Lucas' vision for the film, including his ideas about science fiction in general and in particular his concept of the "used future" which would famously feature in his film Star Wars. Intercut with this discussion is footage shot prior to the start of production of THX 1138 showing several of its actors having their heads shaved, a requirement for appearing in the film. In several cases the actors are shown being shaved in a public location. For example, Maggie McOmie is shaved outside the Palace of Fine Arts in San Francisco, while Robert Duvall watches a sporting event as his hair is cut off. Another actor, Marshall Efron, who would later play an insane man in the film, cut off his own hair and was filmed doing so in a bathtub.