Percy Jackson
Grover Underwood
Annabeth Chase
Luke Castellan
Mr. Brunner / Chiron
Zeus
Hades
Persephone
Athena
Sally Jackson
Poseidon
Gabe Ugliano
Medusa
Ferryman
Lotus Land Bellhop
Aphrodite Girl
Lotus Land Waitress
Hera
Mrs. Dodds / Fury
Lotus Land Dancer
Hysterical Woman
Aphrodite
Apollo
Artemis
Demeter
Hephaestus
Hermes
Dionysus
Grover Girl
Cute Girl
Nymph Warrior
Pretty Girl #1
Pretty Girl #2
Percys Classmate
Poker Buddy
Old Fisherman
Maid at Motel
Smart Ass Kid
Museum Tour Guide
Parthenon Janitor
50s Tough
Son of Ares
College Buddy
Boyfriend
Waitress with Cleaver
Screaming Diner
Stuffy Croupier
Ares (uncredited)
Park Guest (uncredited)
Tyson
Clarisse La Rue
Young Thalia
Chris Rodriguez
Thalia Grace
Chiron
Mr. D / Dionysus
Polyphemus / Laistrygonian
Polyphemus (voice)
Tereus
Young Annabeth
Young Grover
Young Luke
Gray Sister #1
Gray Sister #2
Gray Sister #3
Martha (voice)
Reardon
Ichneutae
Harpy Barista
Barista - Hecatonshire
Kronos
Ganymede
Cyclops #1
Cyclops #2
Parcel Store Customer
Oracle (voice)
George (voice)