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
Pazuzu (The Exorcist) the young Regan is uncredited, the possessed Kokumo was played by Joey Green, and all of Pazuzu's dialogue in the film is provided by Karen Knapp. "The Exorcist III" is the only film in which Pazuzu does not have a physical manifestation, though it still does have a few lines of dialogue, which are voiced by Colleen Dewhurst. In "Exorcist: The Beginning" and "Dominion: Prequel to the Exorcist", the victims possessed by Pazuzu are played by Izabella Scorupco and Billy Crawford respectively, and the voices of Pazuzu are Rupert Degas in the former film and Mary Beth Hurt in the