Directored by: Wei Lo
Produced by: Raymond Chow
Written by: Wei Lo
Release Date: March 22, 1972 (Hong Kong)
Genre: Kung Fu Classic
The film is set in the early 20th century in Shanghai International Settlement. The martial arts student Chen Zhen (Bruce Lee) returns to Jing Wu School to marry his fiancee Yuan Le-erh (Nora Miao). However, tragic news await him; his master Huo Yuanjia had died, apparently from illness. Chen is deeply saddened and traumatised by the sudden demise of his beloved master. During the funeral, some Japanese students from a Dojo in Hongkou show up. They present a sign to Jing Wu, bearing the words "sick men of the East" (????), seemingly as to insult Huo Yuanjia. They taunt the Jing Wu students to fight them and promise that they will "eat their words" if the Jing Wu students dare to fight them and defeat them.
Shortly after, Chen Zhen goes to the Hongkou Dojo alone to return the "gift" (the sign). He meets with hostility from the Japanese students and they engage in a fight. Chen Zhen defeats all of them, including their Sensei (Feng Yi), single-handedly. He uses his master's style of fighting Mizongyi and a Nunchaku as a weapon during the fight. He smashes the glass on the sign and makes the students who taunted him earlier chew up the paper bearing the derogatory words, so as to make them literally "eat their words".
Chen takes a stroll to a park after that. He is refused entry into the park by a Sikh guard who points towards a sign reading "No dogs and Chinese allowed" (????????). After the guard allows a foreigner to bring his pet dog into the park, a Japanese man approaches Chen and tells him that if he behaves like a pet dog, he will be allowed to go in. Chen beats up the man in anger and proceeds to smash the sign with a flying kick.
Meanwhile, the Japanese students retaliate by attacking Jing Wu School on the orders of their master Hiroshi Suzuki (Riki Hashimoto). The Jing Wu students are caught by surprise and are totally unprepared for the onslaught. After causing severe damage, the Japanese students leave. They warn Jing Wu School to hand over Chen Zhen or else Jing Wu will be closed and all the students put under arrest. Chen returns and realises that he has caused big trouble. His fellow students are reluctant to hand him over to the Japanese so they make plans to help him escape from Shanghai.
That night, Chen secretly overhears a conversation between the cook and the caretaker and discovers that his master was killed after consuming biscuits laced with poison. He bursts in and confronts them. Chen kills them in blind rage after they claimed responsibility for Huo Yuanjia's death. Chen hangs their bodies from a lamp post after that. The next day, the Jing Wu students discover the bodies and suspect that Chen is responsible. However, Chen is nowhere to be found. Eventually, Chen's fiancee finds him hiding near Huo Yuanjia's grave. They share a passionate moment together briefly. At the same time, Suzuki forces the local police inspector (Lo Wei) to arrest Chen Zhen and bring Chen back to him. The beleaguered inspector has no choice but to repeat the Japanese's earlier warnings to Jing Wu School. That night, Chen confronts Suzuki's translator and forces a confession out of him, learning the entire truth behind his master's death. He kills the translator after the latter attempted to sneak up on him aand he hangs the body from the lamp post.
The angry Suzuki decides to take matters into his own hands. He sends his men to attack Jing Wu School and kill everyone inside. On the same night, Chen barges into the Dojo to take his revenge. He takes down every single Japanese combatant he meets. Finally, Chen corners Suzuki inside his office. Suzuki uses a Katana to fight back but he is no match for Chen, who is armed with a Nunchaku. In the dramatic ending of the fight scene, Chen sends Suzuki flying out of the room and kills him, thus avenging his master's death. Chen returns to Jing Wu School and finds that many of his fellow students have been killed during the Japanese's raid. Shortly after, the police show up and place him under arrest for murder. Chen speaks to the inspector in private and is assured that Jing Wu School will stay on after he leaves. In the final scene, Chen charges and makes a flying kick at a line of armed soldiers just before they open fire at him.