![Bernard Bresslaw](http://image.tmdb.org/t/p/w92/eN7BkCAAWcAuvrwwjXXCwT4XI2Z.jpg)
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.