A troubled scientist's accidental overexposure to gamma radiation curses him with the tendency to change into a bestial green brute under extreme emotional stress.

David meets a young woman who can't walk. He gets work on her family's ranch and discovers her doctor is slowly poisoning her. After he reports his suspicions to the girl's mother he finds himself the target of a vicious manhunt.

David 'Brown' is flying from San Francisco to Chicago only to find out some of the crew are plotting to steal the Egyptian artifacts on board.