Directed by Vernon Sewell
Produced by Arnold L. Miller, Tony Tenser
Written by Peter Bryan
Cinematography by Stanley A. Long
Film Editing by Howard Lanning
Music by Paul Ferris
Art Direction by Alfred Woods
Set Decoration by Freda Pearson
Costume Design by Marie Feldwick
Makeup : Rosemarie McDonald Peattie
Special Effects by Roger Dicken
Cast
Peter Cushing (Inspector Quennell)
Robert Flemyng (Dr. Mallinger)
Wanda Ventham (Clare Mallinger)
Vanessa Howard (Meg Quennell)
David Griffin (William)
Glynn Edwards (Sergeant Allen)
William Wilde (Britewell)
Kevin Stoney (Granger)
John Paul (Warrender)
Russell Napier (Landlord)
Roy Hudd (Morgue Attendant)
Leslie Anderson (Coachman)
Simon Cain (Gardener)
Robert Cawdron (Chief Constable)
Kenneth Colley (James)
Beryl Cooke (Housekeeper)
Roy Evans (Second Porter)
Joan Ingram (Cook)
David Lyell (Second Student)
John Scott Martin (Snaflebum)
William Maxwell (First Porter)
Michael Mundell (First Student)
Norman Pitt (Police Doctor)
Malcolm Rogers (Dr. Elliott)
Drew Russell (PC Smith)
Honor Shepherd (Senior Housemaid)
Robin Wentworth (Starkadder)