Jonathan E. Steinberg Creator, Writer Rick Riordan Creator, Executive Producer, Writer Walker Scobell Percy Jackson Actor Leah Jeffries Annabeth Chase Actor Aryan Simhadri Grover Underwood Actor Megan Mullally Alecto , Mrs. Dodds Actor Jason Mantzoukas Dionysus , Mr. D. Actor Timm Sharp Gabe Ugliano Actor Jessica Parker Kennedy Medusa Actor Charlie Bushnell Luke Castellan Actor Dior Goodjohn Clarisse La Rue Actor Glynn Turman Chiron , Mr. Brunner Actor Andrew Álvarez Chris Guest Star Threnody Tsai Sarah Guest Star Sara J Southey Tisiphone, Samara Guest Star, Guest Star Jennifer Shirley Oracle Guest Star George Moran Red Team Bully Guest Star Darla Fay Cashier Guest Star Lin-Manuel Miranda Hermes 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 Jeremy Bell Executive Producer Jim Rowe Executive Producer Jon Steinberg Executive Producer Monica Owusu-Breen Executive Producer, Writer Anders Engström Executive Producer, Director Jet Wilkinson Executive Producer D.J. Goldberg Executive Producer Rebecca Riordan Executive Producer Daphne Olive Screenwriter Bear McCreary Original Music Sparks & Shadows Music Jules O'Loughlin Cinematographer