When the vikings test Justforkix's flying skills by throwing him off a cliff, Cryptograf secretly rigs up a rope to him that causes him to be suspended in the foggy air. However, he refuses to leave after having fallen in love with Abba. Travelling to Norway, the pair attempt to rescue Justforkix. When Olaf captures Justforkix, after witnessing his cowardice, Asterix and Obelix find themselves having to rescue him before his father visits their village. When the Vikings arrive near their village, Cryptograf explains to his incredibly stupid son Olaf that he could claim Abba as his wife if he were to capture the Champion, thus putting him next in line as the tribe's chief, with his father secretly calling the shots. Both he and Asterix decide to train him to be a warrior, but have little success because of his pacifist nature and his refusal to drink any of the village's magic potion, which gives the villagers their super-human strength. However his nephew is more interested in chasing girls, using a bird to send messages to them, and is a vegetarian, much to the dismay of Obelix, who can't get him to try wild boar.
Meanwhile, in the rebel village of the Gauls, the villagers welcome the arrival of chief Vitalstatistix's nephew Justforkix, who is to be trained to be a man. Despite being angry, he reluctantly keeps her among his crew. While en route, Timandahaf is shocked to learn that his daughter Abba snuck aboard disguised as a man, after he refused to take her with him. Cryptograf, secretly wishing to seize power from Timandahaf, goes along with it and declares that they'll find who they seek within Gaul. The Viking's chief, Timandahaf, misinterprets his adviser's words and declares they must find a "Champion of Fear", believing that if the tribe were to become great cowards, they'll be able to fly and become invincible. The tribe's adviser, Cryptograf, concludes that their enemies have all fled, stating that "fear gives you wings". The game provides four language options, French being the default.A succession of raids leaves a tribe of Vikings without anyone to fight against them. Each of these stages are themselves based a different comic, which often see the duo visiting a specific country for various reasons. However, instead of travelling Gaul to collect every region's specialty dish like in the comic, Asterix and Obelix instead travel the world and collect souvenirs from various countries to humiliate their aggressors. As in the comic, the duo decide to prove to the Romans that they can go anywhere they wish in spite of the large Roman palisade built around their village. The game's story is loosely based on the fifth volume: Le Tour de Gaule d'Astérix, or Asterix and the Banquet. The player must select on the options menu which player (one or two) plays which hero: the default is Obelix as player one and Asterix as player two. Obelix does not have his trademark invincibility in this game, and so the two characters are essentially equal. The game allows the player to choose either Asterix and Obelix, or play as both in the co-op mode. Asterix & Obelix is a side-scrolling platformer based on the French comic Astérix, about a Gaulish warrior living in the only village in Gaul (France) that has so far resisted the Roman Empire.