It's the 1940s, and the notorious Axe Gang terrorizes Shanghai. Small-time criminals Sing and Bone hope to join, but they only manage to make lots of very dangerous enemies. Fortunately for them, kung fu masters and hidden strength can be found in unlikely places. Now they just have to take on the entire Axe Gang.

Chen Chen returns to his former school in Shanghai when he learns that his beloved instructor has been murdered. While investigating the man's death, Chen discovers that a rival Japanese school is operating a drug smuggling ring. To avenge his master’s death, Chen takes on both Chinese and Japanese assassins… and even a towering Russian.