阿芬(蕭瑤 飾)住在莊家農場附近。農場獨子莊士德(宗華飾)外國歸來，其父想他早日接手一向由胡麟(韋弘 飾)管理的產業。胡一直與德之表妹曼玲(丹娜 飾)勾結！怎知在阿芬飼養的小蛇「西西」幫助下，德與芬結成夫婦。其後，胡竟買一條專咬人的野老鼠，由曼玲放入臥室，欲將德之初生嬰兒咬死，「西西」為救嬰兒，與野鼠作殊死搏鬥……

Based on a popular swordplay novel, this colorful and complex saga (whose Chinese title literally translates into the poetic Meteor, Butterfly, Sword) has enough conspiracies, stratagems, and sword fights to fascinate even novice kung-fu cinema viewers. The cast of Shaw Brothers' leading swordsmen and swordswomen are masterfully staged by Yuen Cheung-yan, the brother of Matrix and Crouching Tiger Hidden Dragon martial arts choreographer Yuen Woo-ping. The result is both a great action movie and an exceptional dramatic film.