On the seventh day after the death of the great hero Huo Yuanjia, Hu En (Wei Pingao), a translator at the Hongkou Martial Arts Arena in Japan, was appointed by Suzuki Kuan (Hashimoto Riki) to bring people to the Jingwu Hall to provoke. Huo Yuanjia's fifth disciple Chen Zhen (Bruce Lee) could not bear the humiliation and went to the martial arts arena alone to fight and defeated dozens of people. Suzuki Kuan was furious and sent people to smash the Jingwu Hall and handed over Chen Zhen within three days. In order to save Chen Zhen's life, the eldest brother (Tian Feng) ordered Chen Zhen to leave Shanghai. That night, Chen Zhen accidentally discovered the clue that his master was poisoned. In anger, he killed the murderer (Huang Zongxun) and his insider (Han Yingjie), and decided to dig out the mastermind behind the scenes...