A decade after defeating the monstrous Kraken, Perseus attempts to retire to a quiet life as a fisherman and sole parent to his young son. However, a great war has erupted between the gods, weakened by humanity's lack of devotion, and the long-imprisoned Titans, who are led by the ferocious Kronos. Betrayed by Hades, Zeus is captured and brought to the Underworld, and Perseus must once again become a hero in order to find Zeus and end the Titans' struggle to rule the Earth.