The Blood Demon was released in the year 1967。The Blood Demon is also called as Schlangengrube und das Pendel, Die, The Torture Chamber of Dr. Sadism, The Snake Pit and the Pendulum, The Snake Pit, Skrækborgen, Skräckens blodiga borg, Pendulum, Castle of the Walking Dead, 13 vergine。

In the Olden Tymes, Count Regula is drawn and quartered for killing twelve virgins in his dungeon torture chamber. Thirty-five years later, he comes back to seek revenge on the daughter of his intended thirteenth victim and the son of his prosecutor in order to attain immortal life.