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.

Upon his return from battle in the previous film, the great warrior Hercules learns that his lover, Daianara, has lost her senses.

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.

Five young men dream of success as they drift lazily through life in a small Italian village. Fausto, the group's leader, is a womanizer; Riccardo craves fame; Alberto is a hopeless dreamer; Moraldo fantasizes about life in the city; and Leopoldo is an aspiring playwright.

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