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 an effects-laden exorcism sequence featuring Nicol Williamson as Father Morning, a character added just for the new climax. Blatty had to make the best of it in the narrative while racing to complete the film. Blatty confirmed that when the possessed Karras speaks in an asexual voice, saying, "I must save my son, the Gemini", that this in fact is either a returned Pazuzu or, as Blatty put it, "Old Scratch himself" taking control. This ties into the revelation earlier in the film that the Gemini was sent into Karras' body as revenge for the Regan MacNeil exorcism. The altered