One year after finding vengeance for his murdered brother, MMA champion Kurt Sloane finds himself back in Thailand kidnapped and imprisoned there by a powerful gangster. His only shot at freedom is to win an underground death match against a 400-pound killer enhanced with state-of-the-art drugs. To make it out alive, he seeks training unlike anything he's ever endured, with the help of the legendary Master Durand and fellow prisoner Briggs.