Effectively creepy Spanish Lovecraft-ian tale.
Both films are not separate but follow each other in continuation. Whereas the first film was pretty decent in atmosphere and conveying lurking terror, the second was a slightly more disappointing outing. The acting could have been better, although the superstar of Spanish horror, Paul Naschy, makes his presence felt in both. These films touch on the Cthulhu mythos and fans will be delighted to see Lovecraft, Aleister Crowley and even Bram Stoker on-screen! (portrayed by actors of course, in the first) Where the films miss out are on characterisation and storyline - it is not directly referenced from any Lovecraftian tale but feels like a mish-mash of several stories weaved into one.
All in all, if you are a die-hard fan of Lovecraft and the Cthulhu mythos, track these down. Semi-decent stuff.
* * * / * * ½