When the hapless Sing (Stephen Chow) and his dim-witted pal, Bone (Feng Xiaogang), try to scam the residents of Pig Sty Alley into thinking they're members of the dreaded Axe Gang, the real gangsters descend on this Shanghai slum to restore their fearsome reputation. What gang leader Brother Sum (Danny Chan) doesn't know is that three legendary retired kung fu masters (Yu Xing, Dong Zhihua, Chiu Chi-ling) live anonymously in this decrepit neighborhood and don't take kindly to interlopers.
Incarcerated for assault and manslaughter, a man (Siu-wong Fan) survives in a futuristic prison by resorting to more extreme violence.