Aliens from the constellation Hydra crash-land on the island of Sardinia. A prominent scientist, his daughter, several young technicians, and a pair of Oriental spies are taken hostage by the beings so they can use them to repair their spaceship's broken engine.

Syracuse lies between the warring nations of Rome and Carthage; as long as the balance of power between the nations remains intact, both nations are willing to preserve the neutrality of Syracuse.

Attila, the leader of the barbarian Huns and called by the Romans "The Scourge of God", sweeps onto the Italian peninsula, defeating all of the armies of Rome, until he and his men reach the gates of the city itself.

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