Liu Chia Liang is kung fu master chen tricked and crippled by the villainous gangster and brothel - keeper tuen (lo lieh) who also forces his sister into prostitution. no longer able to practice the martial arts he becomes a lowly street entertainer performing with his beloved trained monkey ah mao. tuens men slaughter the animal forcingchen and his petty thief side kick little monkey (the remarkable hsiao hou) into mortal combat with the enemy the ultimate test of their mad monkey style kung fu