A mad scientist captures young women and drains their blood in order to keep an ancient, evil duchess alive.
Riccardo Freda made the film on a bet to producers that he could complete in 12 days. After day 10, Freda realized that the film couldn't be finished on-schedule. After his requests for an extension were denied, cinematographer Mario Bava re-wrote the script so that the film could be finished in two days, and directed the remaining scenes himself.
English dubbed version 'The Devil's Commandment' is credited to director Riccardo Freda's pseudonym Robert Hampton.
Original Italian version is 82-minutes long. US distributor re-edited the film, inserting new footage starring Al Lewis and Ronny & Joy Holliday, shortened it to 70 minutes and released it as "Devil's Commandment". The differences are as follows:
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