After his business goes bust, Ng Shun and his family move back to his old apartment to stay with his father. He has not returned for 10 years because the apartment is too small for his family. Furthermore, the environment is unfamiliar to Shun's family. Coincidentally Shun's old childhood friend, Lung returns too. Due to an old misunderstanding, Shun is distrustful of Lung. Will Lung regain Shun's trust again?

清末民初，时局崩坏，孙中山等革命者为推翻清廷统治，四处活动筹集经费，不想却落入了汉奸袁四爷（黄秋生 饰）手中，孙中山被其秘密囚禁，革命党阿华（陈百祥 饰）死里逃生，向五位江湖异人发信求救。于是钟国仁（钟镇涛 饰）、杜海轮（谭咏麟 饰）、沈四官（陈友 饰）、彭健康、费强五名江湖奇人相聚一堂，筹划搭救革命志士，做事颠倒的五人误会了阿华的手信，认为一个名为“铁拳无敌孙中山”的高手将是他们完成任务的最大障碍。钟国仁潜入袁四爷家中，以汉奸的面目获其认可，又以蒙面革命党的身份与袁妹阿琳（陈法蓉 饰）相识相恋，阿琳与其兄不同，同情革命事业，钟国仁为了完成革命任务只得忍痛令杜海轮假扮自己与阿琳接触……
本片是为了纪念温拿乐队成军20周年而拍摄。

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