U.K. writer-director Neil Marshall's follow-up to his campy army-versus-werewolves cult hit Dog Soldiers takes the same basic formula: have a small group of heroes picked off one at a time by hordes of predatory critters, then ratchet up the effects--and the tension. Traumatized by a brutish accident, Shauna Macdonald goes on a spelunking trip with her best friends, though (unbeknownst to her) the reckless planner, Natalie Mendoza, has decided to pick a cave system off the map in hopes of scoring bragging rights.
It proves to be a bad idea, as the cave is not only unstable, but is also populated by carnivorous mutants who look like Gollum might if he hit the gym. Though creepy, the monsters are actually less scary than the cave-ins, which may induce panic-attacks in sensitive viewers. If you saw last year's Cole Hauser flick The Cave, then imagine it not sucking or skimping, and you've got it. Too bad a last-minute trim of the original U.K. ending renders the current finish more confusing than shocking.
--Luke Y. Thompson