Half-Bloods
- Logan Lerman as Percy Jackson, son of Poseidon.[5]
- Alexandra Daddario as Annabeth Chase, daughter of Athena, and Percy's crush.[5]
- Alisha Newton portrays a younger Annabeth.
- Douglas Smith as Tyson, Percy's Cyclops half-brother. Tyson has a more childish personality in the novel while in the film he is more of an awkward teenager kind of guy.[6]
- Leven Rambin as Clarisse La Rue, daughter of Ares.[7]
- Brandon T. Jackson as Grover Underwood, a satyr and Percy's best friend and protector.[5]
- Bjorn Yearwood portrays a younger Grover.
- Jake Abel as Luke Castellan, son of Hermes and the main antagonist.[5]
- Samuel Braun portrays a younger Luke.
- Paloma Kwiatkowski as Thalia Grace, daughter of Zeus.[8][9]
- Katelyn Mager portrays a younger Thalia.
- Grey Damon as Chris Rodriguez, a rogue demigod son of Hermes who joins Luke on his quest to resurrect Kronos.
Gods and Titans
- Stanley Tucci as Mr. D / Dionysus, the god of wine, celebrations, ecstasy, and theatre and director of Camp Half-Blood.[7] He was previously played by Luke Camilleri in the first film.
- Nathan Fillion as Hermes, Luke's father; the god of trade, thieves, travelers, sports, athletes, and messenger of the gods of Mount Olympus.[10] He was previously played by Dylan Neal in the first film.
- Octavia Spencer and Craig Robinson as the voices of Martha and George respectively, the snakes in Hermes' caduceus.
- Robert Knepper as the voice of Kronos, the Lord of the Titans, father of Zeus, Poseidon, Hades, Hestia, Demeter, Hera and Chiron, and Luke's master.
Other characters
- Anthony Head as Chiron, the activities director at Camp Half-Blood. Chiron is a centaur and the immortal son of Kronos and brother of Zeus, Poseidon, Hades, Demeter, Hestia and Hera.[5] Chiron was previously played by Pierce Brosnan in The Lightning Thief.
- Robert Maillet as the motion capture of Polyphemus, an angry cyclops who keeps the Fleece with him.
- Ron Perlman as the voice of Polyphemus
- Hunter Platin as Guard, the Cyclops that guards the Golden Fleece.[9]
- Shohreh Aghdashloo as the voice of Oracle of Delphi
- Missi Pyle,[9] Yvette Nicole Brown[9] and Mary Birdsong[11] as the Graeae
- Jordan Weller as Ichneutae, the acolyte of Clarisse.
- Derek Mears and Aleks Paunovic as Cyclopes.[12]
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