After an astronaut space capsule is detonated in orbit, with the astronaut begging to be killed, a teenager couple finds a severed arm on a remote beach. The boy takes the arm home, where it becomes animate and the alien force which animates it soon possesses his mind as well.

Richard Basehart stars as one of the most influential and one of the most reviled men in history in this probing psychological study of a man who nearly gained dominance over the entire western world--at the cost of millions of lives--Hitler.