紫鹤（陈天文 饰）和萧瑶（叶素梅 饰）约定退隐江湖，过离群索居的日子，然而，就在他们准备离开之时，紫鹤的师傅却将武当派掌门人的位子传给了紫鹤，悲愤的萧瑶自觉遭到了背叛，一怒之下，她创立了白莲教，与紫鹤势不两立，并与他定下了五年之约，五年后进行决战。 云飞（曹国辉 饰）的母亲被慕容家逼死，成年之后，他遇见了名为如烟（潘玲玲 饰）的女子，与此同时，云飞同母异父的兄弟天峰（陈泰鸣 饰）亦在追求着如烟。还珠爱上了善良正直的云飞，而还珠的父亲却是野心勃勃企图谋权逆反的镇南王。五年一晃眼就过去了，当紫鹤和萧瑶双双在决战中死去之时，云飞竟然成为了嫌疑最大的罪魁祸首。
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This 7-year series chronicled the adventures of the Impossible Mission Taskforce (IMF), a team of government spies and specialists who were assigned "impossible missions" by the unseen "Secretary". Although the cast varied over the years, the main characters included The Team Leader (Dan Briggs the first season, then Jim Phelps the other six), The Techno-Wizard (Barney Collier), The Strongman (Willy Armitage), The Master of Disguise (first Rollin Hand, then The Amazing Paris), and The Femme Fatale (Cinnamon Carter, Casey, Dana Lambert, Mimi Davis). The series is best known for its opening mission assignment (conducted by a pre-recorded tape), the theme composed by Lalo Schifrin, the leader's selection of mission agents from a dossier, the opening briefing, the intricate use of disguises and a typical "mask pulloff" scene near the end of most episodes, and the relative lack of characterization of the characters.
