Maciste's village is attacked by pirates. The women, including Maciste's fiancee Guja, are carried off to Salmanak, where dwells the lair of the blood drinking Kobrak. Maciste vows to rescue them.

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.

Hunters trespass into Sukulu country, where animals are sacred, posing as photographers.

Twin brothers were raised by wolves, revolt against tyranny in pre-Roman Italy and then come to a parting of the ways as they lead their people toward the founding of a new city, the founders of Rome.

Secret Agent Bart Fargo chases the kidnappers of the inventor of a death ray.