Caesar wants to wage war and ask the Senate for money, but it is out of the question of conquering anything as long as the village of the Gauls is not Roman. To do this, Caesar decides to send to Gaul a sower of trouble, ex-prisoner, from the name of Tullius Detritus. Arriving in Gaul he intends to offer a vase to the most important person in the village. It should be Chief Abraracourcix, but the lucky one is Asterix. This gesture will bring zizania into the village of Gaul. Everyone will be wary of everyone and by a trick the Romans will make the Gauls believe that they hold the magic potion. Only Asterix and Panoramix suspect themselves of the superchery and leave the village with Obelix to let their companions, all alone, without magic potion...