Wubbzy watches a package that belongs to Walden, who is not home, and is really tempted to see what is inside. Unfortunately, he opens it, figure it out it is a train set, and soon, breaks it!
Wubbzy adopts a fleegle and he feeds him candy instead of the right kinds of food, and it is a big problem – a literally big problem. The Fleegle grows to a massive size, transforms into a monster and causes destruction to Wuzzleburg.