Ultra serious Ko Lap and carefree Kung Kwan are expert assassins.It's love at first sight for Kwan when he runs into the lovely Bin Yee. And Ko Lap continues to hide his love for Sau Yu, agent for him and Kwan. Unkowingly, Ko Lap executes a contract on Yee's father.

So goes to the U.S. to open a martial arts school. Around this time, many Chinese people were sold off to U.S. railroad companies, and were brutally treated by the Americans under the harsh working conditions. Thus, the American workers' hatred towards the Chinese immigrants is high. As a result, So gets into trouble with the Americans and the mob, and calls Master Wong for help.

In order to release his kidnapped sister, sports car mechanic, Chan Foh To, has to defeat a super-criminal street racer.

Sammo Hung plays a cop on the trail of drug dealers. Customs officer Yuen Biao is investigating the same gang. Sammo's new partner is eager-beaver Takeshi Kaneshiro. Despite each having their own ideas on how best to proceed, they are teamed together and must put aside their differences in order to crack the case. Romance, plot twists, comedic asides, and, of course, plenty of fights bring the film to a climatic and bruising conclusion