A clever Shaw Brothers wuxia comedy about a young antihero (Tony Leung Siu Hung) getting himself and his friend (Max Mok) into all kinds of trouble and ultimate defeating the "Heavenly Demon" (Chen Kuan Tai). Lightning fast action, pleasant humor, great acting and a helpful modern-day narrator makes this an unusually enjoyable Shaw Brothers production.

A pair of evil kung-fu artists, Heaven and Earth, are slaughtering the entire Yin-Yang brotherhood.

After avenging the death of his brother, Chen Shen (Bruce Li) returns home from Shanghai. He tells his mother (who went blind from crying over her son's death) that he will no longer fight. However, being a movie with the words "fist" and "fury" in the title, Chen doesn't keep his promise for very long. Japanese occupiers who are aware of Chen's history terrorize his family by, among other things, vandalizing his mother's store and beating up his brother. Later, they frame Chen for a murder. After the Japanese boss arrives in town and causes a ruckus, Chen breaks out of jail for a final confrontation.

Hsiao Hu has been secretly training in martial arts, as his father (Tien Feng) has forbidden him. Later, some local store owners ask Ah to help protect them from a greedy Chinese extortion ring. Ah discovers that the crime lord behind the extortion had killed his father years before and is determined for revenge.