In this film Paul Naschy embodies the Roman general Agrippa Vipsanio in a fierce battle against the tribal leaders Cantabrians, Corocota. Fierce battles, gladiators fighting, adventure and intrigue in this film as in the Roman conquest of Hispania.

"The Frenchman" was what locals called the man who ran the bar and restaurant in the small town of Peñaflor in rural Spain in the early part of the 20th century. But Juan Andrés Aldije Monmeja was not your usual jolly innkeeper. He ran an illegal gambling den and pimped out the waitresses who worked for him. Deciding there were easier and quicker ways to exploit his customers, The Frenchman started slaughtering them, stealing their money and burying their corpses in the garden at the back of his inn. It was not long before people started asking questions...

Paul Marnac and his infirm wife Geneviève move to his childhood estate in the French countryside. The estate is also the site of the castle inhabited by Paul's ancestor Alaric de Marnac, who was known for brutally slaughtering anyone whom he suspected of infidelity. There is a legend that Alaric rises from the grave to continue his deeds. The estate is currently inhabited by Paul's aunt Maville and cousin Julie. Right after Paul and Geneviève arrive, mysterious things begin to happen. Geneviève begins to wonder if the legend about Alaric is true.

A jewel heist goes wrong, resulting in several deaths. Naschy is left with the loot and he takes off with the the cash before the gang is supposed to meet back up. Gang leader Frank Brana sets out to track down the man and the jewels with the help of his gang.

A bizarre cult that practices a ritual of sacrificing humans terrorizes a young doctor and his wife, who have just moved to the group's village.

Period piece set during the Inquisition about a witch-finder general who falls in love with the village beauty, who has made a pact with the devil to seduce and condemn the man who is killing off Satan's servants.