K3 Vriendenboek plot
Hanne, Marthe and Julia (K3) discover everyone's favorite things: from favorite sports to what they want to be when they grow up, and from favorite food to favorite animals. They also take on challenges and visit the nicest places on earth. They do this together with their 'friend book friends': children who submitted it. This is how they go on a discovery, and they enthusiastically participate in all the favorite, but also less favorite things from the large 'K3 Friends Book'. While zapping, Marthe, Julia and Hanne show each other and the viewer what they have experienced, and leaf through their friends' book together in search of new adventures.