Kung Fu Hustle is about a man who dreams of being a ruthless gang member. In his childhood he tried to be good by trying to help a deaf girl. He quickly learned though that good guys never win in a world where evil triumphs. As hard as he tries he has no aptitude in evil. He finds his calling, turns on the bad guys, and with his power delivers justice.

The fighting scenes and special effects are the highlight of this movie, but there are times when Chow seems to overdo the computer effects. The film has a unique humor and doesn't take itself too seriously. Even when women get shot and people get hacked to death, the film maintains an upbeat tone.

When the main character Sing gives up on morality, it mirrors the way many people grow up, lose their innocence, and compromise their morals for the sake of amassing power and wealth.