Italian horror maestro Mario Bava (Black Sunday) provides lots of creepy atmosphere for this cult chiller, which became a major influence for later science fiction and horror films. Barry Sullivan leads the European cast as Capt. Markary, commander of a space rescue mission whose members fall prey (one by one) to zombie-fying possession by alien entities. The film was also released as Demon Planet, Planet of Blood and Terrore Nello Spazio.