Gyro’s ray gun gets into Donald’s hands by mistake. He plays around with it and accidentally shrinks himself to the size of an insect. A fly targets the mite. Luckily, Huey, Dewey and Louie return to the scene of accident and give their uncle his original size back. However, also the fly has been hit. It now has the size of a raptor and starts to attack the Ducks. In the wild chase another magnifying ray breaks loose, hitting Donald anew. The ray gun breaks and giant Donald has a “big” problem.