Cast of The Exorcist III

George C. Scott plays Lt. William 'Bill' Kinderman, a detective investigating a series of murders that may be linked to the Gemini Killer.

Ed Flanders portrays Father Joseph Kevin Dyer, a compassionate priest who is a close friend of Lt. Kinderman and gets involved in the investigation.

Brad Dourif takes on the role of James Venamun / The Gemini Killer, a sinister serial killer who may be possessing the body of another man.

Jason Miller reprises his role as Father Damien Karras / Patient X, a troubled priest who was involved in a previous exorcism.

Nicol Williamson portrays Father Morning, an experienced and skeptical priest who aids in the investigation.

Scott Wilson plays Dr. Temple, a psychiatrist who assists in the case and provides valuable insights.

Nancy Fish appears as Nurse Allerton, a no-nonsense medical professional working in the hospital.

George DiCenzo takes on the role of Stedman, a police detective working alongside Lt. Kinderman on the murder investigation.

Don Gordon appears as Ryan, another detective assisting in the case and helping to uncover the truth behind the killings.

Lee Richardson has a small role as the University President in the film, adding to the intriguing ensemble of characters.

Grand L. Bush plays Sergeant Atkins, a dedicated law enforcement officer involved in the investigation.

Mary Jackson appears briefly as Mrs. Clelia in the movie, adding depth to the world of The Exorcist III.