曾经和平富饶的国度阿拉盖西亚，如今陷在邪恶国王（约翰·马尔科维奇 John Malkovich 饰）的暴政统治下，期待神灵解救敢怒不敢言的人民。一日，农家少年伊拉贡（艾德·斯皮尔斯 Ed Speleers 饰）在林中拾获一枚奇石，不想竟是一枚龙卵，孵出一只蓝色飞龙。伊拉贡为小龙取名“萨菲拉”，遇到先知布鲁姆（杰瑞米·艾恩斯 Jeremy Irons 饰）后，才明白这是一场怎样的机缘——曾经守护这片土地的龙骑士应该回来了，带领人民找回自由。在布鲁姆的指导下，伊拉贡开始学习剑术和驭龙技巧，慢慢从一个普通少年成长为担当重任的龙骑士，前路危险重重，前路通向光明…… 　　本片根据同名小说改编而成，是《遗传三部曲》中的第一部。The Kingdom of Alagaesia is ruled by the evil King Galbatorix, a former dragon rider that betrayed his mates and his people in his quest for power. When the orphan farm boy Eragon finds a blue stone sent by Princess Arya, he sooner realizes that it is a dragon egg. When the dragon Saphira is born, Eragon meets his mentor Brom, and becomes the dragon rider foreseen in an ancient prophecy that would set his people free from the tyrant Galbatorix. Eragon meets the rebels Varden and together they fight against the evil sorcerer Durza and the army of Galbatorix in a journey for freedom.