The Big Boss (Chinese: 唐山大兄, also known as Fists Of Fury) is a 1971 Hong Kong martial arts action film written and directed by Lo Wei, with assistance from Bruce Lee. It stars Lee, Maria Yi, James Tien and Tony Liu. Bruce Lee's first major film, it was written for James Tien. However, Lee's strong performance overshadowed Tien, already a star in Hong Kong, and made Bruce Lee famous across Asia.
Cheng is a Chinese man from Guangdong who has moved to Thailand to live with his uncle. He works in an ice factory with his cousins. When a block of ice is accidentally broken, a bag of white powder falls out. Several of Cheng's cousins are asked to stay to see the manager, who tells them there are better jobs for them. The factory is really a front for a drug smuggling ring led by the Big Boss, Hsiao Mi. When they refuse to cooperate, they are killed and their bodies disposed of.
Two more cousins, Hsu Chien and Ah Pei, go to Hsiao Mi's house to ask about their brothers. They realize he is hiding something and try to inform the police but Hsiao Mi has them killed. When the men at the factory realize two more men have gone missing, they riot. To ease tensions, the Big Boss now makes Cheng a foreman, providing him with alcohol and prostitutes. When one of the prostitutes tells Cheng the truth, he breaks into the factory at night and finds his cousins' bodies. He is discovered by the gangsters.
Cheng fights his way out, killing the Big Boss's son Hsiao Chiun in the process. When he returns home, he finds his entire family has been murdered. He exacts revenge by killing Hsiao Mi in a final fight. He then surrenders to the Thai police, who arrive shortly after he has disposed of the Big Boss.