Danny Glover is heading to Hulu.

The Lethal Weapon favorite has joined the cast of Hulu's highly anticipated adaptation of IDW graphic novel Locke and Key. Also joining the Carlton Cuse pilot is newcomer Jack Mulhern.

Locke and Key is a horror/fantasy series that revolves around three siblings who, after the gruesome murder of their father, move to their ancestral home in Maine only to find the house has magical keys that give them an array of powers. Little do they know, a devious demon also wants the keys, and will stop at nothing to attain them.

Glover will play Joe Ridgeway, the eccentric English teacher at Matheson Academy. After the gruesome murder of their father Rendell, the Locke family moves to Matheson. Joe becomes a mentor to the Locke children and a friend to Nina, but he also knows some of the tragic secrets Rendell kept from his family.

The role, sources say, is not a series regular and may be as small as a cameo. Glover's credits include Emmy nominations for his supporting turn in telepic Freedom Song, guest actor in a drama for Fallen Angels, supporting actor in a mini for Lonesome Dove as well as lead actor in a mini for Mandela in 1988. His credits include Shooter, Saw and Dreamgirls. He's repped by ICM Partners and Principal Entertainment.

Mulhern, meanwhile, will play Tyler Locke, the oldest son of Rendell and Nina and a protective older brother to his siblings. After his dad is murdered, Tyler has to grow up quickly and wrestles with being a teenager and filling his father’s shoes as man of the house. Tyler’s life is even more complicated after discovering his ancestral family home has magical keys that give him a vast array of powers and abilities. This is Mulhern's first role since graduating college. He's repped by the Burstein Co.

Frances O'Connor stars as Nina; It star Megan Charpentier plays her daughter, Kinsey Locke, while Jackson Robert is youngest, Bode Locke. Nate Corddry is set as Duncan Locke, the children's uncle.

Comic book creator Hill and Cuse (Lost, Bates Motel, The Strain) are collaborating on the script for the hourlong pilot. Cuse will executive produce alongside It director Andy Muschietti, Barbara Muschietti and Lindsey Springer, who serves as head of Cuse's production company. Cuse will serve as showrunner. IDW Entertainment president David Ozer, IDW CEO Ted Adams and Hill also executive produce.