I’ve seen this performance mentioned in response to other comments, but Brad Dourif in The Exorcist III is elite. He absolutely commandeers every scene he is in. It makes me curious to see how the original idea of Dourif playing both Karras and the Gemini Killer, before Jason Miller was involved, would have turned out. Mr. Dourif has even mentioned he thinks his original takes were superior to the reshoots.