Percy Jackson and the Olympians has locked in major cast additions for Season 3 to play Atlas and two other key roles as the Disney+ series continues to expand its mythological roster.

Holt McCallany and more join Percy Jackson Season 3

Season 3 of Percy Jackson and the Olympians has reportedly cast the Titan Atlas, alongside two other major characters set to debut in the upcoming episodes. Mindhunter star Holt McCallany has joined the series in a recurring guest role as Atlas, aka the Bearer of Heaven, Deadline reported. In Greek mythology, Atlas was condemned by Zeus to hold up the celestial heavens after the Titans’ defeat. In the series, Atlas gets freed and then aims to lead Kronos’ forces in a renewed war against the Olympians. Additionally, Atlas will be the primary antagonist for next season and is expected to remain a looming threat beyond the season’s central storyline.

Joining McCallany is Breaking Bad’s David Costabile, who will recur as Dr. Thorn, a strict military academy headmaster obsessed with discipline and obedience. Readers of the novels will recognize Dr. Thorn as a human disguise for a mythological figure, though further details remain under wraps. In the books, Percy encounters the character early while attempting to recruit powerful demigods for Camp Half-Blood.

Rent’s Jesse L. Martin has also boarded the Percy Jackson Season 3 cast as Annabeth’s father, Frederick Chase. Described as a brilliant military historian, Frederick is a mortal Athena deemed worthy to raise her daughter. While his relationship with Annabeth has been complicated, the series will explore their efforts to reconnect.

Season 3 is expected to adapt The Titan’s Curse, the third book in Rick Riordan’s five-novel Percy Jackson series. The story follows Percy as he attempts to rescue the goddess Artemis and Annabeth after they are captured by Atlas, setting up one of the franchise’s most consequential fights.