When a martial arts teacher is murdered by his students, his son and heir, Lao Chung (Gordon Liu), escapes but vows to exact vengeance for his father's death. After learning drunken kung fu from an old master, Chung sets out to punish the perpetrators. Eagle Han also stars in this rousing Hong Kong actioner featuring scores of spectacular fight scenes, all choreographed by the legendary Lau brothers.

In the last "Big Boss" (AKA "Fists of Fury"), Cheng Chao-On was arrested after killing Hsiao Mi, "The Big Boss." In this unofficial sequel, his brother, Cheng Chao-Chun, visits his brother in Thailand, finds a job at the same ice factory that his brother worked at and avenges the death of their father.