First of all there is a lot of confusion with the title(s) of this movie. The video cassette release title is "Pesadilla Sangrienta" with the date 1990 given. "Pesadilla Sangrienta" is listed on IMDb with a different director and cast. The website TodoCine has this title as a movie directed by Lucio Fulci. CineFania has the correct information as follows: title, "Vacaciones de Terror 2" aka "Pesadilla Sangrienta" and "Cumpleaños Diabolicos", although their release date is 1989 which differs from everyone. Now if that's clear, on to the review. As far as fans of the genre go, a Mexican horror movie from the 1980's and 1990's is hard to come by. When one pops up, there isn't much of a question but to buy it. Of course if it is advertised as a horror film but turns out to be more of a mystery, you're out of luck. In this case, however, "Pesadilla Sangrienta" is 100% pure horror. And if you thought motion pictures made in the USA covered the market in pop star flicks, think again. Here you get two for the price of one. And yes Tatiana does put on a little concert, which comes off very well. Both singers play it straight and give very pleasing performances. As Tatiana's father, veteran action star Joaquin Cordero's presence is much appreciated by the older viewers. The creature in the movie, though, gives the best performance. If this movie is little known, at least under its alternate title, the monster should rank with the best. Truly scary and different from most run of the mill monsters. It's a shame the plot doesn't match the special effects. The special effects, actually, also serve as the backdrop to the story. And as most movies with "Blood" in their title, there is plenty to go around here. The bottom line, however, is that the story is just drawn out too much. Perhaps as a hour long TV episode it would have worked. At some point this may just wind up as a curiosity piece for fans of Pedro and Tatiana, but the "Bloody Nightmare" monster is certainly worth a look at.