Logan Lerman

Percy Jackson

Brandon T. Jackson

Grover Underwood

Alexandra Daddario

Annabeth Chase

Douglas Smith

Tyson

Leven Rambin

Clarisse La Rue

Jake Abel

Luke Castellan

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

Bjorn Yearwood

Young Grover

Samuel Braun

Young Luke

Mary Birdsong

Gray Sister #1

Yvette Nicole Brown

Gray Sister #2

Missi Pyle

Gray Sister #3

Octavia Spencer

Martha (voice)

Christopher Redman

Reardon

Jordan Weller

Ichneutae

Camille Atebe

Harpy Barista

Anthony Shim

Barista - Hecatonshire

Robert Knepper

Kronos

Richard Yearwood

Ganymede

Derek Mears

Cyclops #1

Aleks Paunovic

Cyclops #2

Maxine Miller

Parcel Store Customer

Shohreh Aghdashloo

Oracle (voice)

Craig Robinson

George (voice)