A small village is taken over by the nasty Japanese, who kill the town's top kung fu fighter in order to scare the populace into submission. Escaping the wrath of the Japanese, the son of the master flees into the hills, where he trains with a group of rebels led by Gam Kei-Chu. Fast-forward ten years, and Chuen returns to the village armed with his father's secret technique of the Thunderbolt Fist with the hopes of killing the leader of the Japanese.
La Familia Yang, hombres y mujeres, habían servido a su país (del Norte Cantado) lealmente a través de largas generaciones. Durante la guerra con Xia Occidental, el General Yang Tsung Pao es presa de una emboscada y asesinado. Su muerte abandona a su único hijo, Yang Wen, como único heredero masculino de la Familia Yang. Su viuda, Mu Kuei Ying, la magnífica matrona y la familia entera intentan vengar su muerte y defender el país.
Instructor Lin who is home from training the imperial troops for several years. He meets his wife and runs into his brother who has become a monk at the local temple. His superior Lord Gao, strangely decides to rape Lin's wife in the temple but Lin interrupts the crime. His brother is enraged and tries to kill Gao but Lin stops him with the help of Lin's training brother and old friend Lu who works for Gao. Lin is loyal to the Commissioner and will not do anything to harm his son. Once back at the Commissioner's house, Gao and Lu hatch a plan to discredit and eventually kill Lin all with the Commissioner's approval. The plan is put into motion and Lin is unjustly arrested for trespassing on imperial property.
