Hercules decides to avenge the death of his wife, murdered at the hands of Éurito, king of Ecalia, but everything is a plot of an ambitious courtier. Hercules ends up falling in love with Deyanira, who is now a good queen.

A Greek soldier leads the fight against an invading Persian army.

Federico, a virtuous nobleman from an impoverished family, is brought into service by autocrat Cesare Borgia. His promiscuous sister Lucrezia seems to have an amorous interest in Federico and wants him as her lover though Federico is in love with Diana, the Duke of Alva's daughter, whom he has saved from being raped. When he learns about Diana's feud against the Borgia clan, he becomes aware of their infamous deeds.

In the military academy of the Nisida Air Force a new course begins which sees among the new recruits called "chicks": Giorgio, forced by his father after he squandered millions at the gaming table; De Montel son of a general, Mario who wants to follow in the footsteps of his father who died in combat; Antonio who declares himself Neapolitan while coming from the province and Ugo who comes from the north.

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.

Because of a drunken father, Manuela is threatened by Vasco, an adventurer involved in shady business.

When a promising record company president is arrested, his daughter takes over his company to promote her own rock and roll music by promoting various young singers.