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
as Doctor Callistratus
Vincent Ball
as Dr. John Pierre
Barbara Shelley
as Madeleine Duval
Victor Maddern
as Carl
William Devlin
as Kurt Urach
Andrew Faulds
as Chief Guard Wetzler
John Le Mesurier
as Chief Justice
Bryan Coleman
as Monsieur Auron
Cameron Hall
as Drunken Doctor
George Murcell
as First Guard
Julian Strange
as Second Guard
Bruce Wightman
as Third Guard
