Asterix and Obelix, nervous about Getafix traveling alone to the annual druids' conference in the Forest of the Carnutes, decide to accompany him on his journey, provided that, as non-druids, they remain outside the forest during the conference. Meanwhile, on the Roman Empire's border, two legionaries are ambushed by a band of Goths (Tartaric, Esoteric, Atmospheric, Prehistoric and Choleric), intending to kidnap the Druid of the Year and use his magic to conquer Gaul and Rome.