What happens when cowboys meet dinosaurs? They fight! Cowboys vs Dinosaurs stars Oscar-nominee Eric Roberts (The Dark Knight) and comes from visual effects artist-turned-director Ari Novak (Live Free or Die Hard). The film hits VOD and Digital HD on May 19th. Check out the exclusive trailer debut above! The official plot summary for Cowboys vs Dinosaurs follows: "After a mining explosion in Livingston, Montana, formerly believed extinct breeds of dinosaurs suddenly emerge from the rubble.