A farmer and his wife live in a rural part of Inner Mongolia with their three children. Chinese population control policies prevent them from having any more. The farmer sets out for the nearest town to obtain birth control. He comes upon a Russian truck driver who has ended up in a lake. The farmer takes the man back to his farm, and after initially being appalled, the Russian becomes enchanted with the peaceful life of the countryside and decides to stay. But his presence presages big changes for the peasants.

During the 12th Century a boy is born to a tribal chief. He is named Temujin, which means "blacksmith." Nine years later, his father is murdered by the Tartars After a long struggle, just when Temujin reclaims tribal chief status, the Merkit tribe kidnaps his wife. In order to fight against the Merkits, Temujin has to use his mother as a pawn in exchange for troops from ally tribes. Temujin manages to rescue his wife only to realise that she is pregnant with the enemy's child. Enduring tremendous anguish, Temujin throws himself into battle against the Tartars and slaughters the leader of the intruders. He eventually takes his wife back and accepts her child. Later on, he begins a campaign to unify all Mongolian tribes. By the age of 40, he is bestowed the title "Genghis Khan", which means "oceanic ruler".

Under Genghis Khan, the Mongolian army pushes west to destroy the Jin Dynasty, setting its sights on the Song Dynasty next. Amid internal conflicts among martial arts schools, Guo Jing unites the Central Plains' warriors to defend Xiangyang, embodying courage and loyalty in the fight for the nation.