A vicious judo expert sets out to prove that Chinese are the "sick people of Asia." There's only one thing which will set things right: the powerful title kung-fu technique, taught by Shih Szu (The Lady Hermit) and learnt by Chuan Yuan (Imperial Swordsman)! 踢那一脚。 民国初年，集贤武馆主人平伯被日本高手谷岚所杀，其子铁娃（川原）入山投大舌头，并将家传「霹雳拳」秘籍交予凤妞（王金凤）保存。铁娃于山中与大舌头之女红蝴蝶（施思）相处甚得。时谷岚之子谷刚（南宫勋）自日本学成归来，悦凤妞美色，挑拨其夫大熊（佟林）与铁娃之误会，幸得凤妞调解，铁娃取得大熊谅解，取回秘籍，辞别还山。后大熊与谷刚决战不敌，死于暗算；凤妞为拒谷刚淫辱，以自杀保清白。铁娃与红蝴蝶得悉，下山为凤妞报仇，卒赖「霹雳拳」的威力，置谷刚于死地.
