The case the Exorcist was based on.

 This made-for-cable drama was adapted from the true story of the only exorcism sanctioned by the Catholic church to be performed in America in the 20th century. Father Bowdern (Timothy Dalton) is a Jesuit priest and military veteran still dealing with the emotional traumas of World War II as he tends to his flock in St. Louis in 1949. A strange case comes to Bowdern's attention -- a boy named Robbie who has strange markings on his body and appears to be under the influence of some otherworldly spirit. Robbie's family believes the child has been possessed by a demon, and in time Bowdern agrees. After receiving the consent of the Vatican, Bowdern attempts the torturous process of casting out the demon, which proves to be as much a test of his own powers as those of the devil. Possessed also stars Piper Laurie, Christopher Plummer, and Henry Czerny. 
 
  Interview with Father Halloran, the real life "Exorcist" 
 
  In-depth filmographies of Peter Laurie, Christopher Plummer, Henry Czerny, Timothy Dalton