When their druid forgets how to prepare the magic potion, Asterix and Obelix must defend the village as Caesar plots to use a Gallic law against them.

In 35,000 BC, the tribe of the Dirty Hairs is at war against the tribe of the Clean Hairs for eight hundred years, trying to get their shampoo. The chief of the Dirty Hairs sends his daughter Guy disguised to the enemy tribe to get some shampoo for his tribe. When the healer of the Clean Hairs tribe surprisingly kills two cavemen of his tribe, their imbecile chief assigns Pierre with curled hair and Pierre blonde to investigate the murder and find the criminal.

Christmas is on its way and with it disaster. The 92,000 responsible for manufacturing children's toys all become sick at the same time! It's a tough moment for Santa, better known as Father Christmas. He's left no choice: he must make an emergency trip to Earth with his reindeer to search for a remedy. When he arrives, he must find some allies to save the magic of Christmas.