元朝末年，政治腐败，民不聊生，各地群雄争相起义，逐鹿中原。当时江湖上传闻有一柄屠龙刀和一把倚天剑，说得刀者即为武林至尊，能号令天下，为得剑者方能与之争锋。武林各大门派为了一统江湖，争霸天下，莫不对这两件宝物垂涎三尺，它们你争我夺，尔虞我诈，从而掀起阵阵腥风血雨，江湖再无宁日。

武當派的張翠山因為和邪教的堂主白眉鷹王的女兒殷素素相戀而為江湖名門正派所不齒，幸好武當派掌門張三豐深明大義，接納了他們和兒子張無忌。然而所謂的名門正派並不罷休，這天齊集武當派要求張翠山講出他的結拜兄弟邪教的金毛獅王謝遜的下落，張翠山為人俠義，不肯出賣兄弟，為了不讓師傅犯難，和殷素素一起自刎於六大派面前。張無忌就這樣成了孤兒，由於無忌從小就身中奇毒，張三豐每隔一段時間都要為他輸入真氣為他續命，也正由於這樣，無忌從小就不能練武，在武當派受盡年青一輩的欺負。一次偶然，無忌掉下了武當山崖，由此開始了他奇妙的江湖之旅。

Zhang Cuishan of the Wudang Sect was despised by the decent sect of the world because of his love for Yin Susu, the daughter of the cult hall master Baimeiying. Fortunately, Zhang Sanfeng, the head of the Wudang Sect, understood the righteousness and accepted them and his son Zhang Wuji (played by Ma Jingtao). However, the so-called upright sect does not stop. On this day, the Wudang sect gathered together and asked Zhang Cuishan to tell the whereabouts of the golden lion king Xie Xun, who had betrayed his brothers and cult. Zhang Cuishan was chivalrous and refused to betray his brothers. In front of the six major factions. In this way, Zhang Wuji became an orphan.

중국 원나라 말기 무림 6대 문파와 새로 등장한 명교와의 대결을 배경으로 무당파의 수제자인 장무기를 중심으로 펼쳐지는 파란만장한 모험과 활약을 그린 작품