A teenager named Percy Jackson discovers that he is the son of Poseidon, a Greek god, and embarks on a journey to settle an ongoing battle between the gods. Along the way, he learns about his powers and fights against monsters and enemies to protect the world.

The son of Poseidon and his friends embark on a quest to the Sea of Monsters to find the Golden Fleece and save their dying safe haven. Along the way, they must confront an ultimate evil and battle mythical creatures with unimaginable powers.