When a mysterious entity possesses a young girl, her mother seeks the help of two Catholic priests to save her life.

Ellen Burstynas Chris MacNeil
Linda Blairas Regan MacNeil
Jason Milleras Father Damien Karras
Max von Sydowas Father Lankester Merrin
Lee J. Cobbas Lt. Bill Kinderman
William O'Malleyas Father Joseph Kevin Dyer
Kitty Winnas Sharon Spencer
Barton Heymanas Dr. Klein
Peter Mastersonas Dr. Barringer
Jack MacGowranas Burke Dennings
Owen Roizman