Col. Frank Saunders (Robert Reilly), a robot invented by scientist Dr. Adam Steele (James Karen), is making his first space voyage when his ship is torpedoed by Martians. Saunders lands in Puerto Rico, and the Martians -- looking to abduct women to repopulate their civilization -- tail him there. The harrowing episode leaves the wounded Saunders looking like Frankenstein's monster, but that doesn't stop him from helping Steele battle Princess Marcuzan's (Marilyn Hanold) Martian warriors.