在这部黑豹天下喜剧/动作/犯罪片中,黑豹（邓光荣 饰）是业内闻名遐迩的大盗，凡是他想要得到的东西，没有弄不到手的。某日，政府官员黄先生（黄锦燊 饰）找到黑豹，委托他盗取一只银盒，为的是测试新装的保安系统的强度，黑豹欣然应允，并找来了嘉嘉（吴家丽 饰）、孟波辉（梁家辉 饰）、程仁（任达华 饰）和师妹青青（林青霞 饰）等人协助。
然而，当黑豹只身行动之时，却遭到了偷袭，对手是他曾经的师兄血狼（元华 饰），所幸青青出手相救，黑豹才得以脱身。原来，血狼正是杀死黑豹师傅的罪魁祸首，只为了得到镇门之宝“豹头刀”，而黑豹想要盗取的银盒内，存放的即是血狼杀人的证据。
Black Cougar is a mercenary who is being paid a huge sum of money by an unknown person to recover a top secret file. Realising the enormity and complexity of the task, he enlists the help of a dummy-sucking computer hacker, a sex-maniacal weapons specialist, and a charismatic 'God of Gamblers' to help him out. When he gets double-crossed by the unknown person. He sets out to seek and destroy him, with the help of his friends. He is in for a shock when he finds out what is in the file, and who the unknown person is.
有的电影，看一次便是永久。梁家辉曾经也是个喜剧演员。莫名其妙的电影。。。。那个时代的《英雄》。
