Brainiac, The (1962)

aka: El Barón Del Terror

In 1661 Mexico, the Baron Vitelius of Astara (Abel Salazar) is 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 passed 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. Also stars Ariadna Welter and David Silva. Also with Germán Robles and René Cardona.