Rick Riordan Creator, Executive Producer, Writer Jonathan E. Steinberg Creator, Writer Walker Scobell Percy Jackson Actor Leah Jeffries Annabeth Chase Actor Aryan Simhadri Grover Underwood Actor Jason Mantzoukas Dionysus , Mr. D. Actor Jelena Milinkovic Nereid Actor Megan Mullally Alecto , Mrs. Dodds Actor Edge Ares Guest Star Charlie Bushnell Luke Castellan Actor Virginia Kull Sally Jackson Actor Timm Sharp Gabe Ugliano Actor Ryan Cowie Chaperone Actor Dior Goodjohn Clarisse La Rue Actor Glynn Turman Chiron , Mr. Brunner Actor Hiro Kanagawa Headmaster Actor Azriel Dalman Young Percy Actor Andrew Álvarez Chris Guest Star Nick Boraine Voice in Dream Actor George Moran Red Team Bully Guest Star Nova Ryzen Smith Hephaestus Kid #2 Guest Star Lin-Manuel Miranda Hermes 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 Jet Wilkinson Director, Executive Producer Anders Engström Director Daphne Olive Screenwriter Sparks & Shadows Music Bear McCreary Original Music Pierre Gill Cinematographer