"Exorcist II: The Heretic" is a 1977 horror film directed by John Boorman. It serves as a sequel to the iconic 1973 film, "The Exorcist." The story follows Dr. Gene Tuskin, played by Louise Fletcher, who investigates the aftermath of the demonic possession of Regan MacNeil, portrayed by Linda Blair. The film explores themes of faith, evil, and the supernatural. The plot delves into the psychological and spiritual struggles faced by the characters, particularly as Dr. Tuskin attempts to understand the nature of the demon that possessed Regan. The film features a mix of horror and science fiction elements, with a focus on the connection between the living and the spiritual realm.