This is the true sequel to The Exorcist, do yourself a favor and ignore The Exorcist II: The Heretic. In this amazing movie, George C. Scott plays Detective Kinderman, and he’s on the trail of the Gemini serial killer. Brad Douriff plays the soul of the Gemini killer, and his performance is chilling. Filled with the nastiest revelations, The Exorcist III: Legion is a worthy and unjustly over-looked sequel.
Full review here.