Shaggy (archive footage) (uncredited)
Casey Kasem
Self
Sandy Duncan
Jonathan Winters
Robin Williams
Announcer (voice)
Marsha Crenshaw
Eustace Bain (voice)
Arthur Anderson
Thundarr the Barbarian (voice)
Doug Preis
Judy Jetson (voice)
Janet Waldo
Muriel Bain (voice)
Thea White
Betty Rubble (voice)
B.J. Ward
Miss Sara Bellum (voice)
Jennifer Martin
Big Red Guy - Chicken (voice)
Charlie Adler
Davy Jones
Daphne Blake (voice)
Grey DeLisle
Wilma Flintstone (Young) (voice)
Caroline Sellers
Barney Rubble (Young) (voice)
B.J. Mitchell
Professor Utonium - Him (voice)
Tom Kane
Bunny Bravo (voice)
Brenda Vaccaro
Porky Pig - Fred Flintstone / Foghorn Leghorn / Elmer Fudd (voice)
Jeff Bergman
Self (uncredited)
Debbie Allen
Producer (uncredited)
Christina Augustinos
Johnny 2x4 (voice) (archive footage) (uncredited)
David-Paul Grove
Kevin (voice) (archive footage) (uncredited)
Kathleen Barr
Tim Conway
Bugs Bunny (voice) (archive footage) (uncredited)
Mel Blanc
Dexter (voice) (archive footage) (uncredited)
Christine Cavanaugh
Jimmy (voice) (archive footage) (uncredited)
Keenan Christensen
Dee-Dee (voice) (archive footage) (uncredited)
Kat Cressida
Mandark (voice) (archive footage) (uncredited)
Eddie Deezen
Patrick Ewing
Self (archive footage) (uncredited)
William Hanna
Ed (voice) (archive footage) (uncredited)
Matt Hill
Scooby-Doo (voice) (uncredited)
Scott Innes
Sarah (voice) (archive footage) (uncredited)
Janyse Jaud
Phyllis Diller
Chuck Jones
Rolf (voice) (archive footage) (uncredited)
Peter Kelamis
Chris Kirkpatrick
Scooby-Doo (voice) (archive footage) (uncredited)
Don Messick
Eddy (voice) (archive footage) (uncredited)
Tony Sampson
Edd (voice) (archive footage) (uncredited)
Sam Vincent
Fred Jones (voice) (archive footage) (uncredited)
Frank Welker
Jonathan Lipnicki
Mayor of Townsville - Top Cat (voice)
Tom Kenny
Johnny Bravo (voice)
Jeff Bennett
Captain Linger (voice)
Ron McClary
Don Knotts
Characters
Joseph Barbera
Executive Producer
Producer
Stuart Hill
Matt Peccini
Writer
Ashley Kohler
Steve Patrick