Sam's dad says that he is too small to fly their new kite, but when Dad, the postman, a bank robber, and some zoo animals get pulled up into the sky, only Sam can save them.
When Stuart Little and his brother George go to the amusement park, George keeps suggesting rides and games that are too big for Stuart, but the hall of mirrors helps put things into perspective.
Everyone tells Charlie that his new toy dinosaur Tex is too big to take anywhere, but he proves to be just right when Charlie needs support at the doctor's office.
Still reduced to the size of insects, Andrew, Judy, and the robot, Thudd, go to a pond, where they encounter dragonflies, moss animals, and fierce larvae in an attempt to learn why frogs are disappearing throughout the world.
When an electric fish shrinks Andrew, Judy, and Thudd to the size of bacteria, they end up being injected by a mosquito into Uncle Al's bloodstream where they must battle germs, parasites, and white blood cells.