Nils is the main protagonist of the series. He lives with his family on a farm in southern Sweden. Nils is lazy and disrespectful to others and enjoys tormenting the animals on the farm. After the farms tomte magically shrinks Nils smaller than the animals he gains the ability to speak and understand animals language. When the farm animals seek revenge Nils flies away with a flock of wild geese on their migration to the north of Sweden for the summer. Nils fervently wants to be restored to his original size.