Louis Koo plays 009, or translated literally from its aural pronunciation, double-O Dog. He's one of 12 special Royal Bodyguards of a simpleton Emperor (Liu Yiwei) who named these 12 guards after the Chinese Zodiac, hence 9 translated to Dog. Unlike his peers, Dog is a scientist, and relies pretty much on his brains and fantastical gadgets to protect his Majesty from evil ninja assassins.
Louis Koo
Barbie Hsu
Louis Fan Siu-Wong
Sandra Ng Kwun-Yu
Yang Jiang
Liu Yiwei
Song Jia
Tong Dawei
Lam Tze-chung
Shi Zhenlong
Law Kar-Ying
Leung Kar-Yan
Kingdom Yuen
Meilin Mo
Lee Kin-Yan