On Christmas Day, Grandpa Troodon sent Timmy a big and mysterious surprise present. And as luck would have it, the parcel and the postman... got lost on the way! Will Rasmus and Timmy never see their present before Christmas? The friends are not used to giving up so easily, so they go in search of the postman in the Swamp Forest. But they say that a giant carnivorous dinosaur roams those places...