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.

While attending the birth of Isabel, the wife of foreigner Felipe, Mama Santos predicts that "something terrible is going to happen in the town." From this omen, calamities will torment the locals.

1976 film by Fernando Cortés