The Hedenhös Kids in Space. Stone age dad Ben Hedenhös sits and looks at the moon and gets an idea. Why not build a rocket and go to the moon. The family Hedenhös constructs a space rocket and takes off. They stay on the moon for a while but then continues through planet Mars. There, they meet a modern metropolis and are presented to the population in different ways. In the end, they get tired and homesick. They return with the rocket with gifts from Mars.
—Ulf Kjell Gür