近未来，神秘症状在人群间扩散，恐惧在空气中曼延。原因不明，只知感染者初期会产生骨骼变异，身体长出毛皮或鳞片，原有人类特质将逐步退化。政府束手无策，只能强制收管已兽化的感染者。方苏瓦深信挚爱的妻子还在那张突变的面孔底下，无论她被转到多远的收容所，他都带着青春期的儿子艾米搬迁跟随。尝试融入新班级的艾米，却意外发现身体也出现了难以启齿的变化⋯⋯

　　It’s the year 50 BC. The Empress of China has just been imprisoned following a coup d’état incited by Deng Tsin Qin, a traitorous prince.
　　Helped by Finalthesis, the Phoenician merchant, and her faithful bodyguard Mai Wei, the Empress’ only daughter Princess Sass-Yi flees to Gaul to ask for help from two valiant warriors Asterix and Obelix, who are endowed with superhuman strength thanks to their magic potion.
　　Our two inseparable heroes gladly accept to help the Princess save her mother and free her country. And thus begins a great voyage and adventure on the road to China.
　　But Caesar and his powerful army, thirsty for a new conquest, are also heading toward the Middle Kingdom.

　　从卢浮宫到白金汉宫,从巴黎的下水道到拉罗谢尔的围城......在一个因宗教战争四分五裂、又面临英国入侵威胁的王国里,一小群男男女女将交叉长剑,将自己的命运与法兰西紧紧联系在一起。