After descending into the realm of the dead to confront their anticipated adversary (Hades), Hercules and Galatea discover that the underworld has been taken over by a new and unexpected force - one that won't stop its assault on the gods of Olympus until it has absorbed all of the pantheon's powers!

Our heroes bravely hurl themselves into the fray against this would-be usurper, but even these divinely touched paragons are still mortal in the end - and their goal quickly shifts from victory at all costs to living to fight another day!