A spaceship is sent to Mars after an alien distress signal is picked up. They find one survivor, but when a crew member is found drained of blood it's evident they have rescued a bloodsucking monster. Uses footage from Encounter in Space (1963).

• Cinema West Productions
• American International Pictures
• Florence Marly
• Basil Rathbone
• John Saxon
• Judi Meredith
• Dennis Hopper
• Robert Boon
• Don Eitner
• Virgil Frye