- Greg Heffley as Percy Jackson
- Rowley Jefferson as Grover Underwood
- Holly Hills as Annabeth Chase
- Rodrick Heffley as Luke Castellan
- Frank Heffley as Poseidon
- Susan Heffley as Sally Jackson
- Fregley as Tyson
- Chirag Gupta as Chris Rodriguez
- Patty Farrell as Thalia Grace
- Heather Hills as Clarisse La Rue
- Mr. Jefferson as Hermes
- Mrs. Jefferson as May Castellan
- Coach Malone as Chiron
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