After getting into trouble, a mischievous young man is sent to train under a brutal, but slovenly old beggar, who teaches him the secret of the Drunken Fist.

A year after training young Jackie Chan in the Drunken Fist, Sam the Seed discovers he has a son, Foggy. He tries to train Foggy but to no avail. Foggy is then trained in Drunken Fist from his uncle as he must face his father's rival, Rubber Legs, another Drunken Fist master who combines it with Mantis Fist to create a deadly style.

A convict (Wang Jang Li) seeks revenge on a man's grandfather who sent him to jail for ten years. But it's up to the old man's grandson to stop him.

This story tells a story of an underdog mistreated by his family, given kung fu instruction from an unlikely source, and redeemed when he comes back to take on foreign champions in a tournament staged before an imperial audience.