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This is one of your better Italian Gothic horror films (maybe they should have done more co-productions with Belgium). The simple plot concerns a group of travelers who end up stranded in an eerie castle. The travelers supposedly represent the Seven Deadly Sins (although after "lust", "gluttony", and "greed" I kind of lost track of who was supposed to be who). They are picked off one by one by a sexy female succubus played by the sumptuous Erica Blanc. There have been a million movies like this over the years, but two things set this apart. One is the atmosphere of horror it creates. This film wasn't directed by any of the Italian Gothic horror greats like Mario Bava, Antonio Marghereti, or Riccardo Freda but it evokes their best works ("Black Sunday", "Castle of Blood", "The Ghost"). The second though is Erica Blanc who manages to be both very sexy and very scary (the latter with the help of some good effect make-up). Interestingly, Blanc has only some very brief nude scenes here, but she plays such a seductive and deliciously evil character so well (especially when she preys upon the hapless priest) that she manages to steam up the screen far more than the two Euro-lesbian characters who spend half their screen time cavorting in the nude. Along with her famous coffin strip tease in "The Night Evelyn Came Out of the Grave" this one of Blanc's most memorable roles and worth the price of admission by itself. It's also a pretty good movie though.

This is an above average example of the type of metaphysical horror film that seemed to proliferate in Europe in the 1970's.

It's simply the story of the Devil, his minion (the succubus) and seven tourists (each representing one of the seven deadly sins) who are forced to spend the night in a sinister castle.

The first hour is rather plodding due to an over abundance of exposition and very little action. Viewer patience is rewarded however during the final half hour when Ilse (the succubus) starts doing what she does best.

Erica Blanc is superb in this role and her transformation from sexy seductress to ghastly succubus is a highlight. Another highlight is Daniel Emilfork as the Devil. His performance is a real stand out when compared to the rather wooden performances delivered by some of the other cast members.

Director Jean Brismee also deserves kudos for several delightfully imaginative flourishes during the death scenes.

All in all it's worth watching if you're a fan of this type of film, but it's definitely not one of my favourite Euro horror films from this era.

6 out of 10.

Movies such as "The Devil's Nightmare" are exactly the type of cinematic smut I live for! It's got everything to magically conjure a gigantic smile on the face of every slightly deranged horror/cult/exploitation fanatic. There's bad & incoherent plotting, macabre set-pieces, a mild Gothic atmosphere, demented characters, shocking themes, lousy gore effects and – not to forget – authentically gratuitous lesbian sex! This Belgian/Italian co-production (love the combination since I myself am Belgian and Italy is my favorite movie-making country) is messed up beyond proportions and describing the essence of the plot would take up at least a couple of pages, so I won't go too much into detail. Let's just say the main storyline revolves on an ancient family curse that turns every first born daughter of the Von Rhoneberg generation into a succubus (= female servant of the devil), and a group of tourists stranded at the family castle are just in time to "celebrate" the devilish pact's 700th anniversary. Furthermore, the baron practices alchemy in his basement, there are Nazi child-executions, a gruesome murder story for every room in the castle, the random torture of cats in the attic, negotiations between a priest and the devil himself and a wide variety of shlocky massacres. A lot of the on screen events don't make sense, and there's no building up suspense whatsoever, but it has to be said that the screenplay does also feature a couple of ingenious and rather clever elements. For example, the Succubus (a luscious Erica Blanc) makes sure that every tourist's death symbolizes his or her biggest sin, whether it's greed, unfaithfulness, curiosity … The killings are very nasty, though hardly scary, and follow each other at an incredible pace, barely allowing you the time to wipe the sinister grin off your face. And if all that isn't enough just yet, wait till you witness the far out climax sequence. Oh yes, "The Devil's Nightmare" is pretty bad… So bad it's freaking brilliant! Easily one of the most entertaining European exploitation movies ever made. It's ten times more exciting than all Jess Franco's movies combined, sleazier that Jean Rollin's horribly dull vampire movies and more demented than … well, anything you've ever seen. It's a damn shame Belgians and Italians didn't collaborate more often back in the 70's, because this crazy puppy is a real keeper.

A neat little Belgian-Italian horror flick brimming with atmosphere. Complete with a kinky wardrobe, Erika Blanc is perfect as Lisa Miller, the succubus. She displays supreme sensuality in her "normal" guise, then transforms into a murderous demon with such face-pulling, over-the-top relish that your skin will crawl. If she's not enough, Daniel Emilfork is on hand to complete things as a corpselike vision of the devil. The deaths are creative and brutal, the Gothic castle is very creepy, and the ending has a shock-twist that you'll never see coming. Julie sings the haunting theme song, which will stick with you long after the picture is over. The only debit is the moralizing angle, which is faintly offensive, but can be overlooked in light of everything else. Very well done on a small budget and beautifully photographed in wonderfully cheap, grainy color.

I saw this movie on videotape under the title Succubus. This tape is an absolute mess--videoburned title, scenes trimmed, scenes out of order toward the end--and should be avoided. It turns a fun, entertaining Euro-horror into a throughly frustrating experience.

Trivia: Though it was released in Europe in 1971, this film did not hit the U.S. until 1974, when Hemisphere released it as Devil's Nightmare to coattail The Exorcist.

'The Devil's Nightmare' starts of well with a flashback sequence involving a Nazi, a knife, and a new born baby. You guess what happens. Then we flash forward to the Seventies with a coach load of tourists turning up at a spooky castle. Pretty quickly we work out that they represent the seven deadly sins (the chubby bus driver constantly munching on chicken wings and sausages was a big help!), though they all seem to moonlight as lust, which is not too surprising in this kinda Euroschlock. Erika Blanc mysteriously turns up, flaunts her cleavage, gets a priest all hot and bothered, and may or may not be a succubus. Soon enough we get a groovy fuzz guitar soundtrack, some hot lesbo action, and a series of bizarre murders which are almost Argento lite. Not too bad at all, and Daniel Emilfork makes a pretty hip Satan.