A young man visiting Hollywood on family business gets into trouble when he sees a bank robbery in progress, and thinks it is a movie scene.
Flora Hawks is in love with the overseer of Tarzan's African estate. After a search for a legendary city of diamonds, Tarzon races with his pet lion Jad-bal-ja to save Haws from being sacrificed to a lion-god.
A stallion known as "The Black" is the leader of a band of wild horses. A cowboy is determined to capture and break him.