"The Big Flub" is the eighty-fourth episode of DuckTales.
Fenton shoots a series of test commercials, but mistakingly creates demand for a nonexistent product. In desperation, he uses a new bubble gum invented by Gyro, who has not had time to test for side effects.
- Hamilton Camp as Fenton Crackshell/Gizmoduck, Store Worker, Singing Umbrella, Referee
- Miriam Flynn as Gandra Dee
- Kathleen Freeman as Mrs. Crackshell, Woman at Store, Electric Worker
- Tress MacNeille as Oprah Webfeet, Floating Woman, Milburn's Wife
- Chuck McCann as Duckworth, Beggar, Butler, News Anchor
- Hal Smith as Gyro Gearloose, Harvey, Man in Line, Chicken Hearn, Mail Carrier
- Russi Taylor as Huey, Dewey, and Louie
- Alan Young as Scrooge McDuck, Restaurant Host