Pazuzu (The Exorcist) the first film, Linda Blair played Regan. Mercedes McCambridge provided the majority of Pazuzu's dialogue, most notably in all the scenes with Fathers Karras and Merrin. In earlier scenes, Pazuzu's voice is provided by Linda Blair herself in some scenes, and Ron Faber in others. The face of Pazuzu is provided by Eileen Dietz, who also plays Regan during the vomiting, levitation and masturbation scenes. Pazuzu is mostly manifested by a swarm of locusts in "Exorcist II: The Heretic", though is also shown possessing the young Regan and a young boy named Kokumo during flashback sequences. While the stand-in for
The Exorcist III deceased serial killer. Blatty based aspects of the Gemini Killer on the real-life Zodiac Killer, one of several serial killers who enjoyed the original "Exorcist." Blatty, who wrote the original "Exorcist" novel (1971) and the screenplay for its 1973 film adaptation, conceived "The Exorcist III" with "Exorcist" director William Friedkin attached to direct. When Friedkin left the project, Blatty adapted the script into a bestselling novel, "Legion" (1983); Morgan Creek Productions bought the film rights, with Blatty as director. To Blatty's frustration, Morgan Creek demanded extensive last-minute changes, including the addition of an exorcism sequence for the climax. Though some