The new Percy Jackson and The Olympians series at Disney+ is filling out its cast.

Aryan Simhadri (Disney’s Spin and Cheaper By The Dozen) and Leah Sava Jeffries (Empire) play Percy’s friends Grover and Annabeth. They join Walker Scobell, who will play Percy.

Here’s an official description:

Based on the best-selling book series by award-winning author Rick Riordan, “Percy Jackson and the Olympians” tells the fantastical story of a 12-year-old modern demigod, Percy Jackson, who’s just coming to terms with his newfound divine powers when the sky god Zeus accuses him of stealing his master lightning bolt. With help from his friends Grover and Annabeth, Percy must embark on an adventure of a lifetime to find it and restore order to Olympus.

1. Riordan and Jon Steinberg will serve as writers of the pilot, and James Bobin will direct.

Simhadri will play Grover Underwood, “a satyr, half boy and half goat, disguised as a 12 year old boy. Grover cares deeply about others and will always choose what is best for them, sometimes at his own expense. Though cautious by nature, he’ll always throw himself into a fight to protect his friends, especially his best friend Percy Jackson.”

Annabeth Chase, on the other hand, “is a true daughter of the Greek goddess Athena. Annabeth is a brilliant strategist with an active and curious mind. After having spent the last five years at Camp Half-Blood, she longs to test her mettle in the human world, of which she barely remembers. She trains Percy to survive the mythological world, and in turn, he helps her connect with her humanity.”

2. Steinberg oversees the series with his producing partner Dan Shotz.

They serve as executive producers alongside Bobin, Riordan, Rebecca Riordan, Bert Salke, Monica Owusu-Breen, Jim Rowe, Anders Engström, Jet Wilkinson and The Gotham Group’s Ellen Goldsmith-Vein, Jeremy Bell and D.J. Goldberg.