Kinderman
Father Dyer
The Gemini Killer
Patient X
Father Morning
Dr. Temple
Nurse Allerton
Stedman (as George Dicenzo)
Ryan
University President
Sergeant Atkins
Mrs. Clelia
Nurse X
Dr. Freedman
Nurse Keating
Shirley
Mary Kinderman
Father Kanavan
Julie Kinderman
Patient A
Dr. Bruno
Korner Boy (as Alexander Zuckerman)
Nurse Merrin
Nurse Blaine
Thomas Kintry
Altar Boy
Mrs. Kintry
Elderly Jesuit (as Father John Durkin S.J.)
Nurse Bierce
Alice
Counter Attendant
Waitress
Police Sergeant
Second Police Officer
Police Driver (as Daniel Epper)
Old Man in Wheelchair
Attendant
Casperelii
Little Old Lady
First Dream Boy
Second Dream Boy
Old Man in Dream (as John A. Coe)
First Dream Woman
Second Dream Woman
Dream Blind Man
Radio Man
Young Girl in Dream
Nurse
Larry King
C. Everett Koop
Angel of Death
Young Boy in Dream (uncredited)
Mental Patient (uncredited)
Nurse (uncredited)
Satan (voice) (uncredited)
Angel (uncredited)
Student (uncredited)
Hospital Ward Priest (uncredited) (unconfirmed)
Patient X Possessed (uncredited)
John Thompson - Georgetown Hoyas Basketball Coach (uncredited)
Man in Purgatory (uncredited)
Asylum Inmate (uncredited)
Crime Photographer (uncredited)
Penitent (uncredited)