In this costume adventure, a dashing swordsman helps protect Philip III of Spain from the traitors trying to overthrow him.

Orazio Menicotti is a night policeman in Rome. One night he is present at a quarrel between husband and wife and he volunteers to take the wife to the Police Station. While he goes around Rome with the blonde and beautiful woman, a bank is robbed.

In ancient Rome, the people finally oust their despised king, Tarquinius, and declare the city a republic. Tarquinius makes an alliance with the Etruscan king, Porsenna, to take back power in Rome, but a Roman general, the heroic Mucius, sets out to stop him.

En route to Thebes for an important diplomatic mission, Hercules drinks from a magic spring and loses his memory. He spends most of the movie in the pleasure gardens of Queen Omphale of Lydia. While young Ulysses tries to help him regain his memory, political tensions escalate in Thebes, and Hercules' new wife Iole finds herself in mortal danger.