Legendary actor Sir Donald Wolfit (Svengali, Room at the Top, Becket) joins British horror queen Barbara Shelley (Village of the Damned, Dracula Prince of Darkness, Quatermass and the Pit) in a lurid tale of ghastly experiments in a Transylvanian prison. Despite being staked as a vampire, the sadistic Dr Callistratus has become governor and is now using prisoners for the blood transfusions that keep him alive...Produced by Robert S Baker & Monty Berman (Jack the Ripper, The Hellfire Club, The Saint), directed by Henry Cass (No Place for Jennifer, Castle in the Air, Happy Deathday) and written by notorious Hammer scribe Jimmy Sangster (The Curse of Frankenstein, Dracula, The Mummy), this long-awaited UK Blu-ray premiere has been remastered from original vault elements and is packed with bonus features.Also starring Vincent Ball (The Black Rider, A Town Like Alice, Summer of the Seventeenth Doll), Victor Maddern (I'm All Right Jack, Circus of Fear, The Lost Continent), John Le Mesurier (