Percy Jackson
Annabeth
Tyson
Clarisse
Grover
Luke
Chiron (as Anthony Stewart Head)
Mr. D
Tereus
Thalia
Hermes
Young Annabeth
Young Grover
Young Luke
Young Thalia
Gray Sister #1
Gray Sister #2
Gray Sister #3
Reardon
Ichneutae
Harpy Barista
Barista - Hecatonshire
Kronos
Polyphemus / Laistrygonian
Ganymede
Cyclops #1
Cyclops #2
Parcel Store Customer
Chris Rodriquez
Polyphemus (voice)
Oracle (voice)
Martha (voice)
George (voice)
Silena Beauregard (uncredited)
Luke's Half-Blood Demigod (uncredited)
Guy by the Chili Truck (uncredited)
Additional Voices (voice) (uncredited)
Demigod (uncredited)
Confederate Soldier Zombie (uncredited)
Ethan Nakamura (uncredited)
Half-Blood Demigod Teen (uncredited)
Zombie Crew #17 (uncredited)