King Boxer (, lit. "Number One Fist in the World"), also known as Five Fingers of Death, is a 1972 Hong Kong martial arts film directed by Jeong Chang-hwa () and starring Lo Lieh. It was produced by Shaw Brothers (HK) Ltd. (Chinese: 邵氏兄弟（香港）公司), the largest Hong Kong movie production studio at the time. The script was written by Chiang Yang (江陽). Made in Hong Kong, it is one of many kung fu movies with Indonesian-born actor Lo Lieh (羅烈) in the lead. He appeared in many similar martial arts film efforts from the 1960s, pre-dating the more internationally successful Bruce Lee. Released in the United States by Warner Bros. in March 1973 as Five Fingers of Death, the film capitalized on the success of Warner's TV series Kung Fu and was responsible for beginning the North American kung fu film craze of the 1970s with over 30 similar films being released in the U.S. in 1973 alone. Warner followed it with the first U.S.-Chinese Kung Fu co-production Enter the Dragon released later that same year which was the most successful of the chopsocky films of 1973. Plot A promising young martial arts student named Chi-Hao has spent most of his life studying under a master and has fallen in love with the master's daughter Yin-Yin. After the master fails to properly fight off a group of thugs, he sends Chi-Hao to study under a superior master, Shen Chin-Pei. He instructs Chi-Hao to learn from Chin-Pei and defeat the local martial arts tyrant, Ming Dung-Shun, in an upcoming tournament in order to earn Yin-Yin's hand. Chi-Hao meets a young female singer, Yen Chu Hung, on the road to the city and rescues her from Dung-Shun's thugs. She falls in love with him, but he resists her advances with difficulty. He reaches town and begins studying under Suen Chin-Pei. After an initial beating by Chin-Pei's star pupil, Han Lung, Chi-Hao improves rapidly. One day, another thug of Dung-Shun's, Chen Lang, breaks into the school and beats all of Chin-Pei's students. Chin-Pei finally arrives and fights him, but is struck by a dishonorable blow and severely wounded. Chi-Hao tracks Chen Lang down and defeats him. When Chin-Pei hears of this, he selects Chi-Hao to receive his most deadly secret, the Iron Fist. Han Lung discovers that Chi-Hao has been chosen as Chin-Pei's successor and becomes intensely jealous. He conspires with Dung-Shun to