Logan Lerman (Percy Jackson), Brandon T. Jackson (Grover Underwood), Alexandra Daddario (Annabeth Tyson), Sean Bean (Zeus), Douglas Smith (Tyson), Leven Rambin (Clarisse La Rue), Jake Abel (Luke), Stanley Tucci (Mr. D / Dionysos), Nathan Fillion (Hermes), Anthony Stewart Head (Chiron), Connor Dunn (Tereus), Paloma Kwiatkowski (Thalia), Derek Mears (Cyclops), Alisha Newton (junge Annabeth), Bjorn Yearwood (junger Grover), Samuel Braun (junger Luke), Katelyn Mager (junge Thalia), Christopher Redman (Reardon), Jordan Weller (Ichneutae), Camille Atebe (Harpy Barista), Anthony Shim (Barista - Hecatonshire), Robert Knepper (Kronos), Robert Maillet (Polyphemus/Laistrygonian), Richard Yearwood (Ganymede), Mary Birdsong (Graue Schwester #1), Yvette Nicole Brown (Graue Schwester #2), Missi Pyle (Graue Schwester #3)