Athena finds out percy and annabeth are dating
During a field trip to a museum, Percy is annoyed at the school bully, Nancy, for bothering Grover and in a fit of rage, accidentally summons water in a nearby fountain to pull her in, but doesn't know how. Dodds, his pre-algebra teacher, witnesses the whole scene and tells him to follow her into the museum for a "talk".
Suddenly, she turns into the Fury Alecto, and attacks him, looking like a bat with humongous fangs. Brunner throws the pen, Riptide , that transforms into a sword in his hand, but when he asks his classmates, nobody remembered Mrs.
Gabe demands money for his poker game and although Percy denies he has any, Gabe deduces that he has change from the cab drive and forces it from him.
Percy's mother arrives soon afterward and tells him that they can go to his favorite beach in Montauk, NY for the whole weekend.
He meets a girl that reminds Percy of Nancy Bobofit, Clarisse La Rue, leader of the Ares' cabin whom he immediately dislikes.
Percy, happy that finally something good has happened, packs his things and leaves, but not before seeing Gabe get hit in the butt by the door when he does a weird hand gesture Grover did and being jeered further by Gabe.
Arriving at the beach, Percy was shocked to see Grover without pants coming to him and his mom, telling them to leave.
Percy's injury from the hellhound heals by touching the water; then suddenly, a holographic tridentfloats above Percy's head which tells everyone that Percy is the son of Poseidon, which explains his powers over water.
The hellhound had come from the Fields of Punishment (which is in the Underworld), not from the forest, which meant that someone within the camp had summoned it because nothing, not even weather, can enter the camp's magic boundaries without permission.