6x1 - Hercules: The Legendary Journeys

Sin came looking for Hercules in the guise of Serena. She said she needed Hercules' help to recapture Xerxos, a murderer who had escaped from her world of evil souls. In truth ""Serena"" was in league with Xerxos. She poisoned Hercules in hopes he would take a life in anger, which would condemn his soul to her domain. But Iolaus was able to keep Hercules from killing Xerxos. The murderer found his sister, the criminal Arciana, and encouraged her to reform before it was too late. Then he and ""Serena"" returned to their realm.