While Hercules (Mickey Hargitay) is away, his people and the woman he loves are killed by the king of Ecalia. Hercules goes to Ecalia to revenge his dead. When he arrives in Ecalia he finds that the king is dead and queen Dianira (Jayne Mansfield) reigns. He saves her and falls for her, but Dianira has been promised to Acheloo. His deed becomes more and more hard among Licos's conspiracy, the Amazons, the Hydra and other monsters.