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