A plain clothes policeman Chin Tai Ba (Leung Kar Yan) is seriously wounded in a fight with some ruffians, but is helped to safety by a young wiseguy, Cub (Wong Yat Lung). Here he is taught the art of Sleeping Fist by Cub"s master Chung Yiu (Yuen Siu Tin) and the trio march to the Shang Wei martial arts school to take revenge on the thugs. However, in a last desperate attempt to get even the gang call on eagle claw master Kao (Kao Hsiung) to sort out the snoozers.