Lt. William 'Bill' Kinderman

George C. Scott

Acting

Father Joseph Kevin Dyer

Ed Flanders

Acting

James Venamun / The Gemini Killer

Brad Dourif

Acting

Father Damien Karras / Patient X

Jason Miller

Acting

Father Morning

Nicol Williamson

Acting

Dr. Temple

Scott Wilson

Acting

Nurse Allerton

Nancy Fish

Acting

Stedman

George DiCenzo

Acting

Ryan

Don Gordon

Acting

University President

Lee Richardson

Acting

Sergeant Atkins

Grand L. Bush

Acting

Mrs. Clelia

Mary Jackson

Acting

Nurse X

Viveca Lindfors

Acting

Dr. Freedman

Ken Lerner

Acting

Nurse Keating

Tracy Thorne

Acting

Shirley

Barbara Baxley

Acting

Mary Kinderman

Zohra Lampert

Acting

Father Kanavan

Harry Carey, Jr.

Acting

Julie Kinderman

Sherrie Wills

Acting

Patient A

Edward Lynch

Acting

Dr. Bruno

Clifford David

Acting

Korner Boy

Alex Zuckerman

Acting

Nurse Merrin

Lois Foraker

Acting

Nurse Blaine

Tyra Ferrell

Acting

Thomas Kintry

James Burgess

Crew

Altar Boy

Kevin Corrigan

Acting

Mrs. Kintry

Peggy Alston

Acting

Elderly Jesuit

John Durkin

Acting

Nurse Bierce

Bobby Deren

Acting

Alice

Jan Neuberger

Acting

Counter Attendant

Alexis Chieffet

Acting

Waitress

Debra Port

Acting

Police Sergeant

Walt MacPherson

Acting

Second Police Officer

David Dwyer

Acting

Police Driver

Danny Epper

Crew

Old Man in Wheelchair

William Preston

Acting

Attendant

Chuck Kinlaw

Acting

Casperelii

Demetrios Pappageorge

Acting

Little Old Lady

Nina Hansen

Acting

Dream Blind Man

Samuel L. Jackson

Acting

First Dream Boy (uncredited)

Shane Wexel

Acting

Second Dream Boy (uncredited)

Ryan Paul Amick

Acting

Old Man in Dream (uncredited)

John Coe

Acting

First Dream Woman (uncredited)

Jodi Long

Acting

Second Dream Woman (uncredited)

Kathy Gerber

Acting

Radio Man (uncredited)

Jan Smook

Acting

Young Girl in Dream (uncredited)

Amelia Campbell

Acting

Nurse

Cherie Baron

Acting

Larry King

Larry King

Acting

Everett Koop

C. Everett Koop

Acting

Angel of Death

Patrick Ewing

Acting

Young Boy in Dream (uncredited)

Clinton Brandhagen

Acting

Mental Patient (uncredited)

Michael Criscuolo

Acting

Nurse (uncredited)

Cindy Cullom

Acting

Satan (voice) (uncredited)

Colleen Dewhurst

Acting

Angel (uncredited)

Fabio

Acting

Student (uncredited)

Randy Aaron Fink

Acting

Angel (uncredited)

Jeff Henry

Acting

Hospital Ward Priest (uncredited) (unconfirmed)

Patt Noday

Acting

Angel (uncredited)

Manley Pope

Acting

John Thompson - Georgetown Hoyas Basketball Coach (uncredited)

John Thompson

Acting

Man in Purgatory (uncredited)

Michael Tove

Acting

Asylum Inmate (uncredited)

Brad Waller

Acting

Crime Photographer (uncredited)

Gary Wheeler

Acting

Penitent (uncredited)

Teresa Wright

Acting

Patient X Possessed

Charles Edwin Powell

Acting