It is revealed early in the film that the magic potion used by the Gauls only lasts for ten minutes.
Caesar is returned to power, and grants the village its freedom.
To defeat him, Panoramix brews a special version of the potion which creates dozens of duplicates of Asterix and Obelix. Caesar co-operates with the Gauls to defeat Detritus, who mounts an attack on the villagers using his own magic potion.