SPL: Sha Po Lang (Chinese: 殺破狼, released in the United States as Kill Zone) is a 2005 Hong Kong action film directed by Wilson Yip, who also writer with Szeto Kam-Yuen and Ng Wai-lun. The film stars Donnie Yen, Sammo Hung and Simon Yam. The film was released on 18 November 2005. Yam portrays a police detective who, suffering from cancer and about to retire, resorts to illegal means in order to catch a ruthless triad boss.