Jonathan E. Steinberg Creator, Writer Rick Riordan Creator, Executive Producer, Writer, Writer Walker Scobell Percy Jackson Actor Leah Jeffries Annabeth Chase Actor Aryan Simhadri Grover Underwood Actor Jason Mantzoukas Dionysus , Mr. D. Actor Charlie Bushnell Luke Castellan Actor Dior Goodjohn Clarisse La Rue Actor Jason Gray-Stanford Maron Actor Glynn Turman Chiron , Mr. Brunner Actor Andrew Álvarez Chris Guest Star Kathleen Duborg Helena Guest Star Threnody Tsai Sarah Guest Star Garfield Wilson Leneus Guest Star Nick Boraine Voice in Dream Guest Star George Moran Red Team Bully Guest Star Nova Ryzen Smith Hephaestus Kid #2 Guest Star Bert Salke Executive Producer Dan Shotz Executive Producer Ellen Goldsmith-Vein Executive Producer James Bobin Executive Producer, Director Jeremy Bell Executive Producer Jim Rowe Executive Producer Jon Steinberg Executive Producer Monica Owusu-Breen Executive Producer D.J. Goldberg Executive Producer Jet Wilkinson Executive Producer Daphne Olive Screenwriter Bear McCreary Original Music Sparks & Shadows Music Pierre Gill Cinematographer