After accidentally killing an opponent in the ring, masked wrestler Superargo quits wrestling and, following the advice of his friend Col. Alex Kinski of the Secret Service, becomes a secret agent, using his superhuman abilities to stop villain Diabolicus' plans to wreck the global economy by turning uranium into gold.

A bandit leader endowed with supernatural powers by his sorceress mother makes yearly raids on a peasant village. However, the women of the village come into possession of a magic sword, and go in search of a hero who is able to wield it and save their village from the evil bandit.

On a beach in Nice, François meets the mysterious Peggy and falls in love with her. Following her to a villa, he meets Marc, a lawyer who has a strange relationship with the girl.