At last, a film that might have actually inspired Alien
instead of ripping it off. A space ship is sent to Mars to investigate the crash of another ship, and when the new crew rescues the lone survivor, they accidentally leave their hatch open, allowing an..."it" to climb aboard. In mid-flight, the creature begins to kill the astronauts in typically bloodless '50s fashion. Despite the outlandish title, it's one of the better, more serious-minded monster flicks of the decade.