Directed by Terence Fisher
Produced by Anthony Nelson Keys
Written by John Gilling
Story : J. Llewellyn Devine
Cinematography by Michael Reed
Film Editing by Eric Boyd-Perkins
Music by James Bernard
Costume Design by Rosemary Burrows
Makeup : Roy Ashton
Special Effects : Syd Pearson
Cast
Christopher Lee (Prof. Karl Meister)
Peter Cushing (Dr. Namaroff)
Richard Pasco (Paul Heitz)
Barbara Shelley (Carla Hoffman)
Michael Goodliffe (Professor Jules Heitz)
Patrick Troughton (Inspector Kanof)
Jack Watson (Ratoff)
Joseph O'Conor (Coroner)
Redmond Phillips (Hans, the valet)
Jeremy Longhurst (Bruno Heitz)
Toni Gilpin (Sascha Cass)
Joyce Hemson (Martha, the mad woman)
Alister Williamson (Janus Cass)
Michael Peake (Constable)
Sally Nesbitt (Nurse)
Prudence Hyman (The Gorgon)