Echidna, the Mother of All Monsters, is out to get Hercules for killing all her children.

While trying to rescue Persephone, Hades' stolen love, Herc visits the Underworld. He's sorely tempted to stay with his beloved dead wife and children.

Salmoneus is set up with treasure stolen from Hera. When Hercules convinces Nemesis that Salmoneus is innocent, Hera sends a deadly creature of fire to eliminate all three of them.