In their very first cinema film 'Fien & Teun Het Grote Dierenfeest' Fien and Teun make it a party! It seems like a normal day on the farm but it is not. They are throwing a big animal party and there is still a lot to do. Fien and Teun hang flags, wrap presents for the animals and bake an apple pie. Only when Stip the Pony comes to stay at the farm, everything suddenly goes wrong! Rosa, Sebastiaan, Pim and Mike & Molly don't like that at first, but Stip really means well. When Mister Beer is suddenly nowhere to be found, Stip gets the chance to prove himself. But is that on time? Can the big animal party still go ahead?