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.

• Artistes Alliance Ltd.
• Donald Wolfit
• Vincent Ball
• Barbara Shelley
• Victor Maddern
• William Devlin
• Andrew Faulds
• John Le Mesurier
• Bryan Coleman