Hui, an owner of a Hong Kong tabloid magazine company hires martial artist Bill Lee to help him get a good headliner for a magazine story to, hopefully, save his failing business.

Struggling actor Chih-Wen (Michael Hui) got a raw deal from his company, MTV Studios. He signed a binding 8-year contract with the studio and was only given one opportunity to perform live thus far. Soon, he received a better deal with a rival company, who promised a 5-year contract and better opportunities to perform and make money. Since he cannot start working for the new company because of his current 8-year contract with MTV, he and his scientist-aspiring brother (Ricky Hui), with the help of magician Shih-Chieh (Sam Hui), attempt to steal the contract from his ruthless manager.

金刚（许冠杰 饰）成功降服白手袜之后，白手袜之兄黑手袜受黑手党指派继续交易钻石并向金刚复仇，金刚与黑手袜的高级机器人大战数合终于侥幸胜利，却马上又落入了牛牛、悠悠兄妹犯罪团伙的骗局，卷入银行抢劫案成为嫌犯，金刚逃亡路上将拍档光头神探（麦嘉 饰）与何东诗（张艾嘉 饰）的婚礼搅得一塌糊涂。所幸光头神探义字当先合力与金刚对抗牛牛、黑手袜，却不料金刚再次被悠悠戏弄，光头神探也只落得被严妻整治。最佳拍档被牛牛团伙胁迫，不得不出面抢夺钻石，而黑手袜方面再次出动高级机器人应战，早有准备的金刚取出机器人特工队，混战一触即发……
本片是最佳拍档系列的第二集。

The police track down a notorious burglar in order to apprehend him. However, he is given a chance to make up for his ways by working with the police on a case involving stolen diamonds.

Li (Sam Hui) works at a sanitarium as a male nurse, and Ah Tim (Michael Hui) is a handy man. One day, a bearded old man is sent into the sanitarium with a large bag. Ah Tim manages to steal the bag, and finds antique fragments inside. When the old man dies, the pair learn from his daughter that there is a sunken vessel that is loaded with much more than they already have, so they decide to go after the sunken treasure.

The kingpin of the Manix Private Detective Agency and his fellow detective solve cases together.

This is a story about a security guard agency and its three agents-Michael, Sam and Ricky. Sam and Ricky are delivering a large sum of money to a bank when a robbery takes place under their nose. after a series of hair-raising about hilarious chases, the agents get their men. With Michael and Sam giving their reward money to Ricky. They live haphazardly ever after.