In 1965 Mexico City, Flavia, a wealthy yet lonely schoolgirl, befriends Veronica, a young orphan girl who has a fascination with witchcraft. Veronica convinces Flavia that she is a real witch and forces her to be her assistant. The children's games gradually become more serious and Veronica demands more from Flavia.

The Kid is a vicious psychopath given to laughing a lot, an actor manqué who leads a gang of looters and rapists, and is incestuous with his father to boot. The town’s resident Mater Dolorosa, madam of the brothel, hires her lover Marcado to kill the Kid, who is of course her son.

When a wandering mercenary named Hogan rescues a nun called Sister Sara from the unwanted attentions of a band of rogues on the Mexican plains, he has no idea what he has let himself in for. Their chance encounter results in the blowing up of a train and a French garrison, as well as igniting a spark between them that survives a shocking discovery.

1972 film by Ismael Rodríguez

Luba, a werewolf woman, revives to destroy humanity. César Harker, a man who fights against the wolves, asks masked wrestling hero Santo for help, for he is the symbol of silver, the only thing that can destroy the wolves.