 The human race has been relocated to a underground city located beneath the Earth s surface. In the underground city, the population are entertained by holographic TV which broadcasts sex and violence and robotic police force enforces the law. In the underground city, society controls all life, all citizens are drugged to control their emotions and their behavior and sex is a crime. Factory worker THX-1138 stops taking the drugs and he breaks the law when he finds himself falling in love with his room-mate LUH 3417 and is imprisoned when LUH 3417 is pregnant. Escaping from jail with illegal programmer SEN 5241 and a hologram named SRT, THX 1138 goes in search of LUH 3417 and escape to the surface, whilst being pursued by robotic policemen.