Mauricio Garcés

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 (imdb)

A group of archaeologists break into the tomb of an ancient Aztec general, arousing the warrior's head and sending his undead servant out to take revenge on the careless scientists. (imdb)