It's 1940s China and the feared Axe Gang has all but taken control of the city of Canton. That is, except in the small and poor apartment complex known as Pig Sty Alley that's run by the Landlord (YUEN WAH) and his mean, chain-smoking wife, Landlady (YUEN QIU), and is of no interest to the gang. Thus, gangster wannabe Sing (STEPHEN CHOW) and his lazy buddy (LAM TZE CHUNG) pick that very place to prove their worth, but they don't expect the resistance that Landlady and the others provide.
Sing's distress flare brings in the Axe Gang - run by their ruthless leader, Brother Sum (CHAN KWOK KWAN) -- who expect they'll easily overrun the place. Like their amateur counterparts, however, they underestimate the will and martial arts mastery of various unlikely heroes in the town -- including Doughnut (DONG ZHI HUA), Tailor (CHIU CHI LING) and Coolie (XING YU) -- who easily best the gang members and send them retreating.
Brother Sum then sends Sing and his sidekick back to Pig Sty Alley to deal with the matter, but when they're unsuccessful, he sends more potent adversaries, including several deadly musicians and the number one killer around, The Beast (LEUNG SIU LUNG) who must be sprung from his high security confinement.
That sets the stage for various wild, funny and deadly battles between the two groups, particularly when more unlikely heroes step up to defend the small apartment complex and its residents from their various assailants.