Karlsson is a very short, very portly and overconfident man who lives in a small house hidden behind a chimney on the roof of a very ordinary apartment building, on a very ordinary street in Stockholm. When Karlsson pushes a button on his stomach, it starts a clever little motor with a propeller on his back allowing him to fly. Karlsson is the best at everything, at least according to himself. But there is, in fact, one thing at which he excels: being a playmate to a young boy named Svante, but nicknamed Lillebror (little brother), who lives in the apartment building with his family. Karlsson is quite mischievous, often getting Lillebror in trouble, but everyone in the end - even Lillebror's family, his cranky uncle, and their dour housekeeper - grow to like Karlsson and appreciate his sense of humour, energy, and good nature.
Did You Know?
In the books, Kalrssons pants are blue but are changed to a more gray hue in the film. This is because of the blue screen effect used for the flying scenes, and had the pants been blue they would've been completely obliterated in the process. A similar thing happened when they shot the Pippi Långstrump TV-series and two movies. See more
Here everything is well organized: The stuff to the right, the things to the left.