John Nada — the name means "nothing" in Spanish, which is not accidental — arrives in Los Angeles looking for work. He is a labourer, a drifter, a man with no particular skills except physical strength and a stubborn refusal to look away from what he sees. He finds a shanty town of homeless workers, a community church that is doing something unusual, and eventually a box of sunglasses hidden in the church wall.
When Nada puts on the sunglasses, the world shifts. Colour drains away — everything becomes black and white — and the hidden layer of reality becomes visible. Every billboard, every magazine cover, every paper bill carries a subliminal message beneath its surface image. The world is saturated with commands directed at the unconscious. And the people wearing expensive suits — the people in positions of authority and wealth — are not human. Beneath the frequency that makes them appear human, they are something else: skeletal, dead-eyed, alien.
The film is adapted from Ray Nelson's 1963 short story "Eight O'Clock in the Morning," in which a man wakes from hypnosis to see the world as it actually is — and must decide what to do with that knowledge. Carpenter expanded the premise into a sustained meditation on class, media, and the nature of consensus reality. The result is one of the few genuinely subversive films ever produced by a major studio — which is probably why it has been so thoroughly dismissed as schlock.