Tarzan's cousin arrives in Africa hoping Tarzan will help him secure a fortune in diamonds vital to England's military security. However, the cousin is quickly killed by his guide Rokov, who then convinces Edwards to impersonate him. Joey, acting as a substitute for Boy, is used by the natives as crocodile bait until Tarzan comes to his rescue. Cast: - Lex Barker as Tarzan - Dorothy Hart as Jane - Patric Knowles as Edwards, an English traitor - Charles Korvin as Rokov, a Russian agent - Tommy Carlton as Joseph 'Joey' Martin - Wesley Bly as Native Captive (uncredited) - Darby Jones as Witch Doctor (uncredited) - Peter Mamakos as Pilot (uncredited) - Bill Walker as Native Chief (uncredited) Runtime: 81 minutes