When Donald punishes the boys and forces them to fix the yard for filling his bath with gelatin, they decide to use a shrinking formula to decrease their workload. Unfortunately, Donald also uses it in his bath, causing him to progressively get younger and younger. Now the boys must stop their uncle from wreaking havoc throughout town.
- Donald's younger self is based on his older character design from The Wise Little Hen.
- Leslie J. Clark from Duck Pimples makes an appearance as the salesman who sells Huey, Dewey, and Louie the shrinking formula.
- Pamela Adlon - Dewey Duck
- Tony Anselmo - Donald Duck
- Corey Burton - Ludwig Von Drake
- Elizabeth Daily - Louie Duck
- Jeannie Elias - Huey Duck
- Pat Fraley - Gwumpki
- Roger Rose - Kent Powers
- Kath Soucie - Daisy Duck, Agent X, Nelly the Dragon
- Frank Welker - The Claw, Knuckles
- Jeff Bennett - E-Z Smith