Arciana and a group of criminals break out of prison to search for the Sword of Hera. 's real-life wife reprises her role of Serena -- sort of. Hercules realizes this isn't his Serena. This being calls herself “Sin“ and says she wants to help recapture Xerxos, who escaped from her realm of punishment. Hercules reluctantly accepts her power and gradually becomes more vicious as they continue to pursue Xerxos and Arciana. Can Iolaus uncover Serena's hidden agenda in time to save Hercules?