Hand of Death, also known as Countdown in Kung Fu, is a 1976 Hong Kong martial arts film written and directed by John Woo. It stars Doran Tan and James Tien in leading roles, and features early supporting performances from Jackie Chan and Sammo Hung. Yuen Biao also makes a cameo appearance. In addition to their acting roles, Hung also worked as stunt co-ordinator, whilst Biao also performed much of the stuntwork, including doubling for both of the principal stars.
According to his book I Am Jackie Chan: My Life in Action, Chan was completely knocked unconscious when he did the stunts on this film. Woo recalled that the stunt, which involved Chan getting launched back by wires after getting kicked mid-air, caused Chan to land on his head and become unconscious for around 20 minutes.