南宋时期，惨遭灭门横祸的郭靖、杨康分别在江南七怪与全真教道士丘处机的教养下成人。18年后，郭靖奉师命南下。杨康却贪恋富贵，认贼作父。郭靖与黄蓉一见如故，彼此倾心，但因华筝之婚约在先，以及江南七怪的反对等多种因素，两人情感可谓一波三折。
五位师父被害于桃花岛，郭靖愤而离开黄蓉。这一对两情相悦的青年，经历了坎坷磨难，才修成正果。恶言恶行的杨康，也难逃惨死在嘉兴铁枪庙中的命运。郭靖随黄蓉故国万里行，遍识天下武林高人，武功日见提升，终于得以报杀父深仇，消师门积怨，夺《武穆遗书》，率大军西征，承亡母之教，上华山论剑，救襄阳国难。这位原本纯朴憨厚、木讷愚钝的射雕英雄，变成一个为国为民、悲天悯人的侠之大者。
China: 1200 A.D.
The Song Empire has been invaded by its warlike Jurchen neighbours from the north. Half its territory and its historic capital lie in enemy hands; the peasants toil under the burden of the annual tribute demanded by the victors. Meanwhile, on the Mongolian steppe, a disparate nation of great warriors is about to be united by a warlord whose name will endure for eternity: Genghis Khan.
Guo Jing, son of a murdered Song patriot, grew up with Genghis Khan's army. He is humble, loyal, perhaps not altogether wise, and is fated from birth to one day confront an opponent who is the opposite of him in every way: privileged, cunning and flawlessly trained in the martial arts.
Guided by his faithful shifus, The Seven Heroes of the South, Guo Jing must return to China - to the Garden of the Drunken Immortals in Jiaxing - to fulfil his destiny. But in a divided land riven by war and betrayal, his courage and his loyalties will be tested at every turn.
