The Wong family kung fu school gets smacked around by a rival school. Wong Fei-hong gets fed up with the abuse and goes to learn from his fathers master. After one of the rival schools members kills some of the towns people Wong Fei-hong becomes enraged trains even more comes back and gets his revenge.
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.
A martial arts master, Tseng Tien-Tu, is employed by master criminal Lung Tung Chien to transport a valuable jade horse. When the horse inexplicably goes missing, Chien demands Tseng's life savings as recompense, driving the uncomprehending Tseng insane. Two conniving con men, Li and Lung, try to convince Tseng that he was double-crossed by Chien, in an attempt to lead them to Chien's stockpile of swindled fortunes.
