Triton, son of Poseidon, possesses power beyond even Zeus and his father. Guided by the Three Fates, he lives as a mortal while his divine abilities remain sealed for three years. Though he secretly protects Poseidonis and becomes engaged to Princess Lia, her family credits Prince Laeus for every victory. As Lia prepares to end their engagement and marry Laeus, only thirty minutes remain before Triton's power returns—and the nine-headed Hydra descends upon the kingdom once more.