In 1661 Mexico, the Baron Vitelius of Astara is sentenced to be burned alive by the Holy Inquisition of Mexico for witchcraft, necromancy, and other crimes       As he dies, the Baron swears vengeance against the descendants of the Inquisitors       300 years later, a comet that was passing overhead on the night of the Baron’s execution returns to earth, bringing with it the Baron in the form of a horrible, brain-eating monster that terrorizes the Inquisitor’s descendants