Logan Lerman character Percy Jackson
Brandon T. Jackson character Grover Underwood
Alexandra Daddario character Annabeth Chase
Douglas Smith character Tyson
Leven Rambin character Clarisse La Rue
Jake Abel character Luke Castellan
Katelyn Mager character Young Thalia
Grey Damon character Chris Rodriguez
Paloma Kwiatkowski character Thalia Grace
Anthony Stewart Head character Chiron
Stanley Tucci character Mr. D / Dionysus
Nathan Fillion character Hermes
Robert Maillet character Polyphemus / Laistrygonian
Ron Perlman character Polyphemus (voice)
Connor Dunn character Tereus
Alisha Newton character Young Annabeth
Bjorn Yearwood character Young Grover
Samuel Braun character Young Luke
Mary Birdsong character Gray Sister #1
Yvette Nicole Brown character Gray Sister #2
Missi Pyle character Gray Sister #3
Octavia Spencer character Martha (voice)
Christopher Redman character Reardon
Jordan Weller character Ichneutae
Camille Atebe character Harpy Barista
Anthony Shim character Barista - Hecatonshire
Robert Knepper character Kronos
Richard Yearwood character Ganymede
Derek Mears character Cyclops #1
Aleks Paunovic character Cyclops #2
Maxine Miller character Parcel Store Customer
Shohreh Aghdashloo character Oracle (voice)
Craig Robinson character George (voice)
