Nils, petit garçon suédois qui vit au sud de la Scannie, est un garçon farceur et méchant, qui aime jouer de sales tours et maltraiter les animaux de la ferme. Mais un jour, pour s'être moqué d'un lutin, Nils va être ensorcelé et devenir tout petit, de la taille d'une souris. Il décide alors d'accompagner une troupe d'oies sauvages dans leur longue migration Il accomplira alors un voyage extraordinaire jusqu'en Laponie avec l'oie Aka, le jars Martin et Quenotte, son hamster. .
Nils Holgersson is a young boy on a farm who is cruel to the animals. But when he catches the farm's little goblin it becomes one prank too many. He is magically shrunk and suddenly the farm animals are out for revenge. He flees on the back of the goose Morten and they join up with a flock of wild geese. Together they travel all over Sweden, with Nils hoping to find a way to become big again..
Nils lives with his parents in the south of Sweden. He is a naughty boy and teases like the animals on the farm. They should not have him and be happy if he is bewitched one day with his hamster Crumb for punishment by a gnome..
This is an animated adaptation of the classic story of Nils Holgersson, a naughty boy who is transformed to a very little dwarf and goes through many adventures, flying with a band of wild geese..