21. The Exorcist III: Legion (1990). William Peter Blatty adapts his novel, Legion, with George C. Scott taking on the role of Detective Kinderman. This is a movie very different in tone from the first (it completely ignores the flaming dumpster fire that was The Exorcist II: Heretic), but still manages to connect to and ultimately complete the story that began with Father Karas’ crisis of faith. This movie is extremely unsettling, with a pervasive, dark, did you just see that? style. The excessive exorcism scene feels a bit tacked on, but the rest of the film is absolutely terrifying, especially if you have a background in Catholicism. This is (religious) horror done right. Like the original, its arresting, almost subliminal imagery will linger on, long after you’ve turned out the lights.