(voices)
Casey Kasem
Buttercup (Voice)
Elizabeth Daily
Bunny Bravo (Voice)
Brenda Vaccaro
The Grim Reaper (Voice)
Greg Eagles
Professor Utonium (Voice)
Tom Kane
The Mayor (Voice)
Tom Kenny
I.R. Baboon
Charlie Adler
I.M. Weasel (Voice)
Michael Dorn
Courage (Voice)
Marty Grabstein
Muriel Bagge
Thea White
Muriel Bagge (Voice)
Dee Dee (voice)
Allison Moore
Little Suzy (Voice)
Mae Whitman
Frank Welker
(voice)
Mindy Cohn
Jim Cummings
Mark Hamill
William Hanna
Joseph Barbera
(archive footage)
Ted Turner
Don Messick
Bubbles (Voice)
Tara Strong
Jhonny Bravo (Voice)
Jeff Bennett
Blossom (Voice)
Cathy Cavadini
Dexter (Voice)
Christine Cavanaugh
I.R. Baboon (Voice) / Cow (Voice) / Chicken (Voice) / Red Guy (Voice)
Billy (Voice)
Richard Steven Horvitz
Mandy (Voice)
Grey DeLisle
Characters
Executive Producer
Director