Despite Kulderzipken's assurance he can continue to do as he pleases after ceding the throne as custom demands after princess Prieeltje's marriage the next day, king Jozef is suspicious enough to be actually relieved when he can send his future son-in-law and successor to the moon instead, because Frans Vanderschijnsel, the man in the moon, is on strike against his boredom there, which means the broken moon will fall onto the world and destroy humanity. The only way to get to the moon is a machine invented by the Grimms, but the voyager must jump off it so he can never return. Kulderzipken accepts, only to find the games and stories he brought are no cure, but out of love invents another way to deal with the grumpy man as well as the broken moon and to return to the castle. There the king gives him a last task: getting the wedding guests passed Rudolf, a relative of the queen, who believes to be a horse since a famine, when his mother told him as a boy to eat straw just like 'strong and beautiful' horses...
—KGF Vissers