A decade after his heroic defeat of Kraken, Perseus the demigod son of Zeus is attempting to live quietly as the sole parent to his son Helius. But unbeknownst to Perseus, a struggle for supremacy has been raging between the gods that will come to threaten his idyllic life. Enlisting the help of the warrior Queen Andromeda, demigod Agenor, and fallen god Hephaestus, Perseus embarks on a quest into the Underworld to rescue Zeus, overthrow the Titans and save mankind.