An evil queen is suppressing her subjects and stealing young virgins to be sacrificed to an evil god (in this case, the god of a volcano). Naturally, Maciste intercedes. However, he soon falls under the magic spell of the queen, who lusts for his finely chiseled body. He is now a slave to her evil will. In the end Maciste is freed from the spell, but he must now save the life of the girl who saved him and she is about to become the latest sacrifice to the volcano god!