The Exorcist III - Official Trailer - 1990

The Exorcist III is a 1990 American psychological horror film written for the screen and directed by William Peter Blatty, based on his 1983 novel Legion. It is the third installment in the The Exorcist film series. The film stars George C. Scott, Ed Flanders, Jason Miller, Scott Wilson, Nicol Williamson, and Brad Dourif.

The Exorcist III is set fifteen years after the events of The Exorcist (1973), ignoring the events of Exorcist II: The Heretic (1977). The film follows a character from the original film, Lieutenant William F. Kinderman, who investigates a series of demonic murders in Georgetown that have the hallmarks of the Gemini, a deceased serial killer. Blatty based aspects of the Gemini Killer on the real-life Zodiac Killer, one of several serial killers who enjoyed the original The Exorcist.