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.