Percy Jackson
Grover Underwood
Annabeth Chase
Tyson
Clarisse La Rue
Luke Castellan
Young Thalia
Chris Rodriguez
Thalia Grace
Chiron
Mr. D / Dionysus
Hermes
Polyphemus / Laistrygonian
Polyphemus (voice)
Tereus
Young Annabeth
Young Grover
Young Luke
Gray Sister #1
Gray Sister #2
Gray Sister #3
Martha (voice)
Reardon
Ichneutae
