A man and wife are terrorized by Mad Scientist Dr. Callistratus who was executed but has returned to life with a heart transplant. Along with his crippled assistant Carl, the 'anemic' Mad Scientist, believed to be a vampire, conducts blood deficiency research on the inmates of a prison hospital for the criminally insane to sustain his return to life.
Donald Wolfit
Vincent Ball
Barbara Shelley
Victor Maddern
William Devlin
Andrew Faulds
John Le Mesurier
Bryan Coleman
Cameron Hall
George Murcell
Julian Strange
Bruce Wightman
Barbara Burke
Bernard Bresslaw
Hal Osmond
Milton Reid
Patricia Phoenix
Jack Carter