Hercules, Morrigan and Nebula return to Corinth to discover the people following the cult-like form of Iolaus, who is possessed by Dahak.

Hercules and Zarathustra must exorcise Dahak from Iolaus' body.

Hercules, with the help of the Amazon Ephiny, the Centaur Nagus and a youth marked for murder, must stop a volcano from destroying the people of Mount Pelion.