| Percy | | Ethan White |
| Annabeth | | Hanna Carroll |
| Grover | | Ryan Kaplan |
| Luke | | Shane Gillis |
| Clarisse / Charon | | Lorelei Stahl |
| Sally / Camper | | Reya Rivera |
| Mr. D / Ares | | Chloe Ferraro |
| Chiron / Aunty Em / Hades | | Emma Durand |
| Mrs. Dodds / Gabe / Kronos / Poseidon | | Michael Hughes |
| Silena Beauregard | | Michaela Horan |
| Katie Gardner | | Katie Scali |
| Camper / Oracle / Train Conductor | | Camille Bishop |
| Camper / Echidna / Greyhound Passenger | | August Emmert |
| Camper / Squirrel / Farmer / Greyhound Passenger | | Avery Barcelos |
| Camper / Bianca | | Mabel Backman |
| Camper / Newscaster | | Allison Zenga |