Xena's old enemy Callisto returns from the afterlife when she makes a deal with Hera to kill Hercules in exchange for immortality.

Saving a beautiful creature that is part woman and part deer pits Hercules against his half brother Ares and the vengeful Prince Nestor.

When Hercules proposes to Serena, he must deal with Iolaus's disapproval, Deianeira's hurt feelings and Ares' plot to destroy the relationship.