Taking advantage of cheesy tricks, Totokamen pretends to be the son of the god Amun and to have divine superpowers.

The Pharaoh Ramsis is in the meanwhile facing the betrayal by the strongman Maciste, who has inexplicably joined Egypt's historical enemies (the Assyrians) and is guiding them to an unstoppable attack to the country.

This is orchestrated by Ramsis' unfaithful wife, who has resorted to witchcraft to charme Maciste and achieve absolute power over the country.

Upon hearing from a minister about Totokamen's spectacle and claims of demigod status, the pharaoh decides that he should guide Egyptian defense against the invaders.

The Pharaoh remains in power, Maciste is pardoned, and Totokamen manages to exploit the confusion in order to escape from palace before being exposed as a fraud.