Svante is a young boy who lives with his family in a Stockholm apartment. One day he meets Karlsson, a chubby little man in the prime of his life, who can fly using a propeller on his back and who lives in his little house on the roof.
Karlsson's grandmother is the world's best racing driver and Karlsson is not so bad either. Kaxige Kirre challenges Karlsson in a box car race. Now it is up to Karlsson and Lillebror to build a really fast car so that they can give Kirre what he can stand. Little brother has made a kite at school that he wants to test fly with Bosse. Just this day, it blows a lot so the dragon wears itself out and sticks out into the sky.
