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 Jelena Milinkovic Nereid Actor Azriel Dalman Young Percy Jackson Actor Ryan Cowie Chaperone Actor Virginia Kull Sally Jackson Guest Star Suzanne Cryer Echidna Guest Star Nick Boraine Voice in Dream Guest Star Alessandro Juliani Transit Cop #1 Guest Star Ely Jackson Transit Cop #2 Guest Star Gayle Yamamoto Mom Guest Star Winson Won Dad Guest Star Julia Lee Child #1 Guest Star Joshua Lee Child #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 Jet Wilkinson Executive Producer Anders Engström Director Joe Tracz Writer Daphne Olive Screenwriter Bear McCreary Original Music Sparks & Shadows Music Jules O'Loughlin Cinematographer