In one of the featurettes on the Dark Sky DVD, director Serrador claims that he should have put the footage about atrocities done to children -- more than seven hard-to-watch opening minutes about concentration camps, children in Vietnam, Korea, Biafra, starved, burned, tortured -- at the end of the movie. Of course he's wrong: It would have spoiled the whole movie, especially after the very last sentence that spins the film in a direction known from a lot of cheap zombie flicks: The script robs itself of its mystery, though it's a minor letdown in an otherwise perfectly crafted, well-shot (by Jose Luis Alecaine, who also worked with Saura, Luna, Faenza, Almodovar, you name it) and relentlessly gripping story that never lets go, until the ultimately bleak and depressing ending -- the only possible conclusion to this unjustly forgotten gem of Spanish 70s genre cinema. If you hate children, this is the film for you; and if you hate adults, too.