This story is based on some writings by famous poet Gustavo Adolfo Becquer, as ¨Mount of Animas¨, ¨Miserere¨ and ¨Devil's cross¨. This is a Spanish film but the director is John Gilling , a master of Hammer production. Gilling was on holidays in Spain and Paul Naschy or Jacinto Molina asked him to make this movie . Being shot on various Spanish locations in Talamanca del Jarama , Casa de Campo, Madrid , and Escalona, Toledo, Castilla-La Mancha . The film is starred by all the best Spanish cinema actors: Carmen Sevilla , Adolfo Marsillach , and Eduardo Fajardo , Fernando Sancho , both of whom made many spaghetti Westerns .
The plot is a mess of ghosts and skull crusaders, a rip-off of the zombies of Amando De Ossorio who, by that time realized many creepy films about the blind Templar Zombies, today deemed semi-classics. However, the movie is dreary and dull . Gilling's direction is boring , it's too far from Hammer film but for a Spanish film is OK. Many years later would come Alejandro Amenabar and his successful horror pictures.
The motion picture was middlingly directed by John Gilling . He was a good craftsman , a notorious writer/producer/director who worked for the prestigious Hammer Films , developing a long career making movies of all kinds of genres , such as : The Gilded Cage, The Guilty Person, The Embezzler, Double Exposure, Escape by Night, Recoil , Deadly Nightshade , The Voice of Merrill, The Frightened Man , The Quiet Woman ; but he stands out in Horror genre , such as : The Plague of the Zombies, Panic , The Mummy's Shroud , The Gamma People, Mother Riley Meets the Vampire , Devil's Cross, The Reptil and The Flesh and the Fiends.
