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A young woman, Jill Young, grew up on her father's ranch in Africa, raising a large gorilla named Joe from an infant. Years later, she brings him to Hollywood to become a star.

Superman agrees to sacrifice his powers to start a relationship with Lois Lane, unaware that three Kryptonian criminals he inadvertently released are conquering Earth.

Zandra, white princess of a lost civilization, comes to Tarzan for help when Nazis invade the jungle with plans to conquer her people and take their wealth. Tarzan, the isolationist, becomes involved after the Nazis shoot at him and capture Boy: "Now Tarzan make war!"

A young couple die in a plane crash in the jungle. Their son is found by Tarzan and Jane who name him Boy and raise him as their own. Five years later a search party comes to find the young heir to millions of dollars. Jane agrees, against Tarzan's will, to lead them to civilization.