When a China-run oil refinery is attacked in Mosul, Iraq, a Chinese private security contractor is called in to extract the oil workers. He learns, however, that the attackers’ real plan is to steal a fortune in oil, and teams up with an American former Marine to stop them.

In the fourth installment of the fighting franchise, Boyka is shooting for the big leagues when an accidental death in the ring makes him question everything he stands for. When he finds out the wife of the man he accidentally killed is in trouble, Boyka offers to fight in a series of impossible battles to free her from a life of servitude

Ninjitsu master Casey is back and out for revenge when his pregnant wife is murdered.

Captured international assassins are locked up inside a high-tech bunker known as the Killing Chamber. To break out of this concrete hell they must duel each other, fight deadly ninjas and battle against gangs of masked maniacs. And... if they survive this, they will have to confront Snakehead: the lethal, deranged top dog who will stop at nothing to kill 'em all!