"THE PREY: Legend of Karnoctus" (not rated, 1 hour, 33 minutes, On Demand) A far-fetched military/horror effort in which a group of mercenaries searching for treasure in the Afghanistan desert, along with retreating U.S. soldiers, is trapped in a cave by a rocket explosion, where they're being tracked by a legendary deadly beast. At least Danny Trejo always fun to watch is in the cast. So is Nick Chinlund, Adrian Paul, Kevin Grevioux, Fahim Fazli and Masika Kalysha; directed by Eric Hensman and Matthew Hensman.