Chan falls back into the familiar role (in name, at least) of lovable scamp Lung, who along with his brother Lo (Wei Pak), lives in a martial arts school run by the venerable Master Tien (Tin Fung). Things are going just swell until Lo, Master Tien’s star pupil, fakes an injury and secretly lion dances for the rival school. After Lo’s treachery is revealed (along with a prostitute he bought with his ill-gotten gains), Master Tien banishes the elder brother from the school. Grief-stricken, Lung vows to track his brother down and get him to make amends, but as Lo ventures out alone, he falls in with the wrong crowd, participating in a jailbreak that frees uber-baddie Kam (Whang In-Sik).
Unfortunately, Lung finds himself mistaken for Lo, and consequently has to battle the local authorities during his quest. Also, in a series of comic interludes, Lung meets up with Marshal Sam Kung (Enter the Dragon’s Shih Kien), his fleet-footed son (Yuen Biao), and his beautiful, but deadly daughter (Lily Li). Lung eventually convinces the famous lawman to allow him to bring in the evil convict to nullify his brother’s crime. What ensues is undoubtedly one of the most brutal fights in the young Jackie Chan’s career, quite unlike anything Chan had done before.
