Kate Scodelario as Thalia Grace of Olympus

Lindsey Morgan as Reyna Avíla Ramirez Arellano of New Rome

Jeff Bridges as King Zeus of Olympus

Christina Applegate as Beryl Grace of Olympus (deceased but mentioned)

Kelsey Chow as Piper McLean

Adria Arjona as Queen Bellona of New Rome

Lucas Till as Jason Grace of Olympus

Jake Abel as Luke Castellan of the Kronian Dynasty

(The one thing the movies did right: Luke's casting.)

Dylan O'Brien as Percy Jackson

Leven  Rambin as Annabeth Chase of Athens 

Yara Shahidi as Hazel Levesque of Plutoania

William Behlendorf as Frank Zhang

Brenton Thwaites as Will Solace 

Skandar Keynes as Nico di Angelo of the Underworldian Dynasty 

Olivia Rodrigo as Bianca di Angelo of the Underworldian Dynasty 

OH GOD I'M NEARING THE IMAGE LIMIT UMMM HOW ABOUT JUST POSEIDON AND HADES NOW I GUESS....

Johnny Depp as Hades of the Underworldian Dynasty

Jason Mamoa as Poseidon

Cast pt. 2 coming out later!