Seven years after the apparent death of Chen Zhen, who was shot after discovering who was responsible for his teacher's death (Huo Yuanjia) in Japanese-occupied Shanghai. A mysterious stranger arrives from overseas and befriends a local mafia boss. That man is a disguised Chen Zhen, who intends to infiltrate the mob when they form an alliance with the Japanese. Disguising himself as a caped fighter by night, Chen intends to take out everyone involved as well as get his hands on an assassination list prepared by the Japanese.

Two mountain road racers, Nakazato and Takahashi, challenged each other to find the best racers, and defeat them in "battles". Nakazato was surprisingly defeated by an old Toyota Trueno AE86 (Corolla in the US) one night, and he searched for the person who defeated him, which lead him to the Speedstars, a local team. But the car who beat him was actually driven by a local Tofu shop owner's son, Takumi Fujiwara, who had unknowingly perfected the art of mountain racing through daily deliveries of tofu. Takumi was able to defeat Nakazato again, showing that he is no fluke. However, winning hasn't helped him home life, as his father, Bunta Fujiwara, was a drunkard (and a racing genius). His girlfriend Natsuki Mogi wants his attention even though she's got a dark and shameful secret, and his best friend Itsuki (who has no talent in driving) wants Takumi to teach him road racing...

The paranoid registrant administrator of the Department of Public Safety Erroll Babbage is forced to an early retirement due to his abusive behavior against the sex offenders that he should monitor, and shall spend his last eighteen days training his replacement Allison Lowry. When the seventeen years old Harriet Wells is considered missing in his area of work, Errol is convinced that her disappearance is related to one of his parole sex offenders. However, his superiors do not believe on his investigations and he convinces Allison to follow him in the sick underworld of pornography and perversions trying to find the missing girl.

A futuristic research compound develops a new police tool called the Power Glove. Supposedly, it gives the wearer incredible powers by letting him tap into the 'unused 80%' of his mental potential. It turns out that the glove also enables the wearer to take over the minds of others, and one unbalanced police volunteer tries to use this to stage a coup. In the end, one of the three test cops is killed, another survives to stay on the force, and the rogue cop makes his escape. 20 years later, the dead officer's son gives away his identity by using his father's personal martial arts technique in a fighting competition, thus drawing the attention of both the remaining good and evil supercops. The kids and the old guys must then start getting ready for a multi-generational final battle of good vs. evil.

Months after the events of the original film, Ming suspects a police superintendent as being a new mole for the triads, while years earlier, Yan embarks on his first mission.

In this prequel to Mou gaan dou (2002), Chan Wing Yan has just become an undercover cop in the triads while Lau Kin Ming joins the police force. Both the triads and the police find an enemy in a rival crime boss.