When Alvart sticks to his story’s central mystery, the film is an eerily effective mixture of ecological science fiction and horror. Unfortunately, it is constantly undercut by the perfunctory deployment of cannibalistic humanoids and inane martial-arts fighting. Alvart shows a deft touch when developing suspense, and he knows the value of a good shock moment, but he allows too much of the film to devolve into hectic action sequences that makes you feel like someone suddenly dropped you into a blender and turned out all the lights. (Hollywood Jewel 16, Waco, TX)