Percy and the seven have been given an underwater quest out of the realm of Poseidon to find a crown but it's not ordinary. It is meant for the child of the prophesy ( the one when you turn 16). But they don't know along there way what they'll meant or even who. This has been delayed because of Poseidon. <gasp> Meanwhile underwater spongebob and the rest are just hanging around bikini bottom, not knowing who will come to see them.