The perfidious brother of the deceased Duke of Lusitania usurps the throne from its legitimate heir, the Grand Duchess; however, an enigmatic man in black known only as the Zorro is out for justice. But, who is this valiant vindicator?

A US Secret Service agent must go to Hong Kong because of the disappearance of some important documents that carried her former partner in the Korean War. These documents, if they fell into enemy hands, could be very dangerous and cause many more deaths.

The evil Queen Tenefi demands that a steady supply of young women be sacrificed to the God of Fire. Maciste intervenes and saves from this sacrifice a village's women including the beautiful Antea. Maciste then becomes involved in an effort to restore to the throne of Memphis its rightful ruler, Prince Iram.

In 54 B.C. Julius Caesar seeks to solidify his position in Rome by putting down a rebellion in Gaul led by a tribal chieftain named Vercingetorix. Vercingetorix has rallied many tribes to his cause, including one led by the beautiful Queen Asterid and others who'd once pledged allegiance to Rome.

The evil King Zagro has designs on the beautiful Princess Sira. He wants to marry her so he can take over her kingdom and add it to his own. When Sira is kidnapped, Ursus leaves his farm to rescue her and to eventually lead a revolt against King Zagro.

Hercules comes from Greece to Ravenna, Italy, because a friend from childhood days has sent for him: Hercules should help the Roman Emperor who is in danger because of an intrigue lead by the leader of the pretorian guards.