The incessant confrontation of the Gauls with the Roman invaders forces the latter to constantly capitulate to the defenders of the village. Recently, a close friend of Asterix, Obelix, lost his memory as a result of a huge stone block falling on his head. Now, the main character, for some time, will have to fight back on his own against a strong, but not very smart opponent. 

To all the troubles of the inhabitants of the settlement, the deception of a wandering fortune-teller named Prolix was added, who fooled the gullible villagers, after which he disappeared into the forest. The generals running the legions are doing their best to curry favor with Caesar. When troubles occurred in the camp of the eternal enemy, one of the military leaders sent a scout to the village. The scout failed to lead the Gauls, who begin to experiment on the production of a new potion on the prisoner. Soon the spy managed to escape and report to the management about the problems of local residents.