Helpless to save his family from Hades, the god of the underworld, Perseus, mortal son of the god Zeus, embarks on a mission to defeat Hades before he can seize ultimate power and unleash hell on earth.

After he learns he is the son of Poseidon and is accused of stealing Zeus' lightning bolt, Percy Jackson sets out to recover the bolt, prove his innocence, and prevent a war between the gods that could destroy the Earth.