Johnny Weissmuller's ninth Tarzan film is based on an interesting script by Carroll Young. Tarzan, Jane (Brenda Joyce), their son Boy (Johnny Sheffield), and faithful sidekick Cheta the Chimp stumble upon an entire village in which a peaceful tribe has been wiped out by what looks like murderous leopards. Investigating further, Tarzan confronts Lea (Acquanetta), the queen of a ruthless secret cult of cat people who wear iron claws. It is she who was responsible for the murders, and her followers capture Tarzan, Jane and Boy, and prepare to offer them as sacrifices to their feline dieties. Cheta is their only hope for escape.