Watch full movie online: Sergeant Dead Head (1965), for free
An astronaut goes into space with a chimpanzee. When they return to Earth after their orbit, it is discovered that the chimp has the brains of the astronaut, and the astronaut has the brains of the chimp. Complications ensue.
Director: Norman Taurog
Writer: Louis M. Heyward
Stars: Frankie Avalon, Deborah Walley, Cesar Romero