The Exorcist III is a horror mystery film that takes place in Georgetown in 1990, 15 years after the infamous exorcism of Regan MacNeil. The film follows Lieutenant William F. Kinderman, a veteran detective, as he investigates a series of murders that appear to be connected to the executed serial killer, Gemini Killer. The killings are characterized by decapitation and profane religious acts, similar to those performed by the Gemini Killer. As Kinderman delves deeper into the case, he discovers that the murderer is not a human, but a supernatural entity that has taken on the form of the Gemini Killer. The entity is revealed to be a demon who has returned to wreak havoc on the world. kinderman soon realizes that he needs help from an unlikely source: Father Damien Karras, the priest who was involved in Regan's exorcism and was thought to have died years ago. Karras returns and teams up with Kinderman to defeat the demon and put an end to its reign of terror. The Exorcist III features George C Scott as Lieutenant Kinderman and Brad Dourif as James Vennamun/Gemini Killer alongside Ed Flanders as Father Joseph Dyer ,Tom Atkins as sergeant Mel atkins among others

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Some movies that have similar genres and were produced around the same time as The Exorcist III include Jacob's Ladder, In the Mouth of Madness, Stagefright, Dust Devil, Meridian, Witchboard.

The Exorcist III was released in theaters on August 17, 1990.