The police plan to capture a killer by using a double that looks exactly as one of his victims.

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

1963 film

An anthropologist goes to the mountains to study the problems of the indigenous people and finds out that they are being dispossessed of their lands.

Northern Mexico, early 20th century. Reynaldo del Hierro is murdered while riding with his sons Reynaldo and Martín, whose mother instills in them the need for revenge.

A taxidermist decides to murder his wife after having to put up with her after twenty years of hellish marriage.