A young girl is abducted by her tutor, and they set off in a ship which has a sheik on board, who tries to molest her, but she is saved by a sailor. He and Maciste fight off the entire crew but the girl is captured again by the sheik and carried off to his harem, where Maciste and the sailor rescue her and take her back to Italy.
Count De Cay is happily married to a beautiful woman loyal to him. During an innocent and fortuitous encounter with one of his ex-lovers, however, he is surprised by his elderly uncles, who warn the countess.
Maciste takes advantage again of a break of acting in order to wash away injustice and castigate the wicked, this time in the name of dynastic legitimacy. Otis, the prince of Sirdagna kingdom, lives undercover in a foreign land, waiting to ascend the throne; Stanos the evil ruler though, is willing to do anything in order to prevent the legitimate prince installation. The court is a dangerous place, Otis is young and naïf: in order to solve the situation, Maciste, following the advice of his friend Saetta, temporarily takes Otis’s place, and presents himself as the legitimate prince. The crowd, enamored by his good looks, applauds him immediately as the emperor.
Cainá is a young peasant who lives in a small village in Sardinia together with her goats and parents. She is a wild and free spirit and unconventional for any small and closed communities dominated by old rules. Cainà yearns to escape from such a closed atmosphere and the isolated island, so, as an old tune says: "Somewhere beyond the sea, somewhere, waiting for me…"; When a boat arrives to the island, she will do her best to flee away from her little oppressing village and experience new adventures in the continent with the help of the boat captain.
