Behind the dark shadows of Hong Kong's triad underworld, one man, Wong Po (Sammo Hung), rules with an iron fist. After years of dedicated service, veteran detective Chan (Simon Yam) finally puts him behind bars. However, on the eve of his trial, Po orchestrates the execution of the prosecuting attorney from his jail-cell, and walks away as a free man.
Having been diagnosed with terminal cancer, Chan persuades his men to take the law into their own hands in a last desperate attempt to bring their arch-nemesis to justice. Ma Kwun (Donnie Yen), a detective inspector with a hard-as-nails reputation, begins to uncover their illegal methods and a bloody confrontation ensues. However, when Po's most deadly assassin (Wu Jing) begins to dispatch Chan's team with lethal efficiency, he is compelled to join forces with Ma to take down the greatest criminal empire of their generation.
Culminating in the long-awaited showdown between action legends Sammo Hung and Donnie Yen, Kill Zone combines knife-edge suspense and electrifying full-contact fight sequences to deliver a thrill-a-minute spectacular that's in a class of its own!