In a white-on-white future society, bald citizens are known by code numbers and toil in drugged stupour over meaningless tasks while chrome-faced robot policemen herd dissidents convicted of "drug avoidance" into vast white limbo prisons.
THX (Duvall) is puzzled by the awakening of his emotions as he falls in love with his room-mate (Maggie McOmie) — who has altered his drug intake — and becomes a rebel. Notably adult in theme, structure and approach, its commercial failure doubtless motivated George Lucas's regression through adolescence (American Graffiti) to childhood (Star Wars) in his subsequent films.