Kowloon Walled City is a Hong Kong martial arts film directed by Cheang Pou-soi (鄭保瑞) and starring Louis Koo Tin-lok (古天樂), Sammo Hung Kam-bo (洪金寶), Richie Jen Hsien-chi (任賢齊) and Raymond Lam Fung (林峯). The film is an adaptation of the manhua City of Darkness by Andy Seto (司徒劍僑), a comic artist who specialises in martial-arts based stories.

The movie tells the story of the Northeast Street Fighter A Neng (释行宇 Xing Yu) who lives in Hong Kong. He was interrogated by the police as soon as he sneaked ashore. Fortunately, Jia Hui (虞朗 Yu Lang), who returned from studying abroad, rescued him. However, Jia Hui's father died of a serious illness, and the southern part of the walled city he was in charge of was watched by all forces. A Neng takes care of Jia Hui in time, and gets acquainted with Sister Hong (孙子钧 Sun Zi Jun) in the western district under the lead of A Kun (吕宇 Peter Lu Yu), who wants to reorganise the order of the city. At this time, the mysterious evil forces that have been entrenched in the North District for many years stretched out their claws ......