Watch Online Free on Watchseries. It's Plop's birthday and that, of course, has to be celebrated. Kwebbel, Klus and Lui send Plop into the woods for a long, relaxing walk so they can prepare the party in the meanwhile. But won't Kwebbel talk too much? Can Lui stay awake long enough to help? And won't Klus' new invention cause problems? Let's hope it all goes well..