Katelyn Mager
Young Thalia

Grey Damon
Chris Rodriguez

Paloma Kwiatkowski
Thalia Grace

Anthony Stewart Head
Chiron

Stanley Tucci
Mr. D / Dionysus

Nathan Fillion
Hermes

Robert Maillet
Polyphemus / Laistrygonian

Ron Perlman
Polyphemus (voice)

Connor Dunn
Tereus

Alisha Newton
Young Annabeth