Actor Jackie Chan, Yuan Biao, Li Lili, Tian Feng

Introducción breve: The most senior apprentice of the martial arts school is dismissed because of his misdemeanor. With no way to go he mistakenly released the imprisoned Gold-legged Viper, a dangerous criminal. The chief police detective of five provinces, Sam Kung and his fourth son are trying to arrest the senior apprentice. Meanwhile, the Master regrets about his severe punishment and sends Ah Lung, a junior apprentice to fetch his senior. Sam Kung and his fourth son suspect Ah Lung as an accomplice and have him arrested. They meet the senior apprentice on the way back to the provincial office. Father and son realize that Ah Lung is innocent, and Ah Lung begs them to release his senior, while promising that he will arrest Gold-legged Viper. Father and son accept the offer and retain the senior apprentice for the time being. Ah Lung gets hold of Gold-legged Viper, but is no match to him. However, after he has mistakenly drunk the residue of the water-pipe, he become invincible and finally captures Gold-legged Viper. The senior apprentice is released on receiving the criminal and Ah Lung returns back to the martial arts school with his senior.