Blood of the Vampire1958

Horror Vault's take

In the shadowy corridors of a prison for the criminally insane, the resurrected Dr. Callistratus — brought back from execution through grim surgical means — holds terrifying sway over the helpless inmates in his care. Obsessed with a rare blood condition that threatens his unnatural second life, this cold and calculating figure uses the captive population as unwilling subjects in his relentless experiments. A young couple find themselves ensnared in his web, with no easy path to escape his ruthless grip. Part Gothic horror, part mad-science nightmare, this late-1950s British chiller blurs the line between the supernatural and the scientifically sinister.

Content: Scenes Set In A Prison Asylum With Disturbing Depictions Of Captivity, Medical Experimentation On Unwilling Subjects, Period-Typical Horror Violence