The Exorcist was greenlit for a first season. In February 2008, American playwright John Pielmeier expressed an interest in adapting William Peter Blatty's novel of the same name into a play and soon met with Blatty. He then began working on a script for the play, in which the first draft was completed in ten days. "The Exorcist" first premiered at the Geffen Playhouse, Los Angeles in 2012. A horror VR video game, called "The Exorcist: Legion VR", was published on Steam, Oculus and PlayStation in 2018 and was based on the events of "The Exorcist III". In November 2009, it was
The Exorcist III film), as the protagonist. Blatty conceived "Legion" as a feature film with William Friedkin, director of "The Exorcist", attached to direct. Despite the critical and commercial failure of the previous sequel, Warner Bros. was keen to proceed with Blatty and Friedkin's plans for another "Exorcist" film. Blatty said that "everybody wanted "Exorcist III"... I hadn't written the script, but I had the story in my head...and Billy [Friedkin] loved it." Friedkin, however, soon left the project due to conflicting opinions between him and Blatty on the film. The project went into development hell, and Blatty wrote "Legion" as a novel