Accident prone teenager, Percy discovers he's actually a demi-God, the son of Poseidon, and he is needed when Zeus' lightning is stolen. Percy must master his new found skills in order to prevent a war between the Gods that could devastate the entire world.

In their quest to confront the ultimate evil, Percy and his friends battle swarms of mythical creatures to find the mythical Golden Fleece and to stop an ancient evil from rising.