When the gods capture Prometheus, mankind begins to lose the gifts he gave them: fire and the ability to heal themselves. It's up to Xena, Gabrielle, Hercules and Iolaus to try to free Prometheus from his chains but whoever is the one who frees him, may end up dead.

Xena and Gabrielle team up with Hercules, when Zeus declares that Xena's unborn child must die so that the prophecy will not be fulfilled. Meanwhile, Xena decides to travel to the underworld to retrieve Hade's helmet of invisiblity to allow her and her baby to hide, and runs into her son, Solan who has chosen to live in Tarturus.