The kids learn just how many things you can do with three sticks. Then, when Nick drops his mail bag into his train set, his fingers are too big to get it out. So they shrink down to get and use the right sized tool.
Sally thinks that three sticks aren't enough to make anything. Cat takes them to a place where they can get more sticks, along the way, they discover just how many things you can do with three sticks. / When Nick drops the mail bag into his train set, his fingers are too big get it out. Cat shrinkamadoodles them so they're small enough to be in the train set.