(see images on yahoo)
Percy:Logan Lerman
Grover:Brandon T. Jackson
Annabeth:Alexandra Daddario
Hades:Steve Coogan
Pesephone:Rosario Dawson
Athena:Melina Kanakanedes
Zeus:Sean Bean
Chiron:Pierce Brosnan
Poseidon:Kevin Mckidd
Medusa:Uma Therman

(OMG percy is sooo cute! i forgot who plays luke but hes cute also!)