Sammo Hung plays a ruthless crime boss that is doggedly pursued by an elite police unit. The leader of the unit is dying of cancer and is about to retire. But he swears to bring down the crime boss before retirement. And the four men in his unit vow to help their leader take down the crime boss, by any means necessary.
Donnie Yen is set to take over the unit and learns that these men are willing to go above the law to end Sammo Hung's criminal activities. Donnie Yen must chose whether to follow the letter of the law or join his men in bringing down the crime boss and his forces.
Unfortunately Kill Zone is light on action. But when it happens it is as you would expect from Donnie Yen who stars and serves as fight choreographer. Light on wire work, the fight scenes rely on skill. And even though Sammo Hung is much older and suffers many injuries from his past stunt work, you will not notice.
Sammo Hung plays the villian expertly. And his fighting skills keep pace with the younger Donnie Yen. Their climactic battle and an alley fight between Yen and a sword-weilding thug highlight the action in this film.