While RedCat and WhizzKitty are in the tree house playing with their racetrack, they receive a message. It comes from the six national champions of the European Kart Competition. They challenge everyone to a competition. Whoever wins all races gets the Golden Euroster, which no one has ever managed to do before. Of course they want to participate. However: Brutus and Max discover this and decide to join in, so that they can buy a lot of cheese and bones with the star. The four of them travel to Europe to take part in the race and compete for the star.

While RedCat and WhizzKitty are in the tree house playing with their racetrack, they receive a message. It comes from the six national champions of the European Kart Competition. They challenge everyone to a competition. Whoever wins all races gets the Golden Euroster, which no one has ever managed to do before. Of course they want to participate. However: Brutus and Max discover this and decide to join in, so that they can buy a lot of cheese and bones with the star. The four of them travel to Europe to take part in the race and compete for the star.