A young girl joins hands with a group of kung-fu masters to stop a notorious gang from abducting young women. However, the mission is compromised after they fail to locate the gang's hideout.

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!