Sinopsis
Regan es una niña de doce años víctima de fenómenos paranormales como la levitación o la manifestación de una fuerza sobrehumana. Su madre, aterrorizada, tras someter a su hija a múltiples análisis médicos que no ofrecen ningún resultado, acude a un sacerdote con estudios de psiquiatría. Éste está convencido de que el mal no es físico sino espiritual, es decir, que la niña es víctima de una posesión diabólica. Por eso, con la ayuda de otro sacerdote decide practicar un exorcismo.
Reparto
Ellen Burstyn — Chris MacNeilLinda Blair — Regan MacNeilJason Miller — Father Damien KarrasMax von Sydow — Father Lankester MerrinLee J. Cobb — Lt. Bill KindermanWilliam O'Malley — Father Joseph Kevin DyerKitty Winn — Sharon SpencerJack MacGowran — Burke DenningsBarton Heyman — Dr. KleinPeter Masterson — Dr. BarringerRudolf Schündler — KarlGina Petrushka — WilliRobert Symonds — Dr. TaneyArthur Storch — PsychiatristThomas Bermingham — TomVasiliki Maliaros — Mary KarrasTitos Vandis — Uncle JohnJohn Mahon — Language Lab DirectorWallace Rooney — Bishop MichaelRon Faber — Chuck / Demon (voice)Donna Mitchell — Mary Jo PerrinRoy Cooper — Jesuit DeanRobert Gerringer — Senator at PartyMercedes McCambridge — Demon (voice)Paul Bateson — Radiologist's Assistant (uncredited)Elinore Blair — Nurse (uncredited)William Peter Blatty — The Producer (uncredited)Mary Boylan — First Mental Patient (uncredited)Dick Callinan — Astronaut (uncredited)Mason Curry — Doctor (voice) (uncredited)Toni Darnay — Violent psychotic patient (uncredited)Eileen Dietz — Demon / Regan Double (uncredited)Joanne Dusseau — Senator's Wife (uncredited)Bernard Eismann — Minor Role (uncredited)Beatrice Hunter — Minor Role (uncredited)Yvonne Jones — Bellevue Nurse (uncredited)Don LaBonte — Minor Role (uncredited)Barton Lane — Angiography Doctor (uncredited)Ann Miles — Spiderwalk (uncredited)John Nicola — Priest (uncredited)Vincent Russell — Subway Vagrant (uncredited)Gerard F. Yates — Priest Singing Around Piano at Party (uncredited)Ρίτα Σακελλαρίου — (her voice on the radio)