Frank Welker
Fred Jones / Scooby-Doo (voice) (42 eps)
Casey Kasem
Norville 'Shaggy' Rogers (voice) (42 eps)
Mindy Cohn
Velma Dinkley (voice) (42 eps)
Grey DeLisle
Daphne Blake (voice) (42 eps)
James Arnold Taylor
Burr Batson / Champ Truman (voice) (8 eps)
Dee Bradley Baker
Fish Fiend (voice) (8 eps)
Jeff Bennett
General Niedermeyer / Mr. B / MP Guard #1 (voice) (8 eps)
Jennifer Hale
Thorn (voice) (7 eps)
John DiMaggio
Glasburgh Dragon / Officious Dwarf / Judge (voice) (5 eps)
Steve Blum
Rama Yam / Spencer Johnson (voice) (5 eps)
Tom Kenny
Sam / Harry Harrison (voice) (5 eps)
Lauren Tom
Nancy Chang (voice) (4 eps)
Kevin Michael Richardson
Announcer / Red Guy (voice) (4 eps)
Kimberly Brooks
Elliott Binder (voice) (4 eps)
Colleen O'Shaughnessey
Jingle (voice) (4 eps)
Eddie Deezen
Gibby Norton (voice) (3 eps)
Tara Strong
Terry / Joe (voice) (3 eps)
Rob Paulsen
Avery Orenthal / Government Agent (voice) (3 eps)
Daran Norris
Camel Sam / Tourist Dad (voice) (3 eps)
Fred Tatasciore
Skeleton (voice) (3 eps)
Nick Jameson
Rebel Canyon (voice) (uncredited) (3 eps)
Jim Cummings
Cyrus T. Buford / Crawdad Mike / Joe (voice) (2 eps)
Tasia Valenza
Lupe Chesares / Wormian #2 (voice) (2 eps)
Brian Tochi
Hakimoto (voice) (2 eps)
Pamela Adlon
Janey / Bobby Blather (voice) (2 eps)
Phil LaMarr
Col. Henry Thomwald / Shaman (voice) (2 eps)
Roger Rose
Narrator / Policeman (voice) (2 eps)
Carlos Alazraqui
Luis Santiago / Umpire (voice) (2 eps)
Mark Hamill
Barge Captain (voice) (2 eps)
Taylor Lautner
Ned (voice) (2 eps)
Rachael MacFarlane
Sheila (voice) (2 eps)
Rino Romano
Coral Creature (voice) (2 eps)
Kevin McDonald
Walter Claphammer (voice) (2 eps)
Frankie Ryan Manriquez
Jimmy (voice) (2 eps)
John Stephenson
Zelig (voice) (2 eps)
John O'Hurley
Beavis Bottomczek (voice) (2 eps)
William Schallert
Professor Pomfrit (voice) (2 eps)
Jane Wiedlin
Dusk (voice) (2 eps)
Stacy Keach
The Mayor (voice) (2 eps)
Michael Gough
Drill Sergeant Payne / MP Guard (voice) (2 eps)
John Gabriel
Dr. Zola / Worker (voice) (2 eps)
Moira Quirk
Mei Ling (voice) (2 eps)
Greg Ellis
Russian PA Announcer / Nicolai / Bob (voice) (2 eps)
Lindsay Pagano
Self (voice) (1 eps)
Kath Soucie
Susan Dinwiddie (voice) (1 eps)
Brian Unger
Avalanche Anderson (voice) (1 eps)
Hector Elizondo
Dr. Gutierrez (voice) (1 eps)
Dave Foley
Laslow Oswald (voice) (1 eps)
Bumper Robinson
Cap N' Robbie / Native Bearer (voice) (1 eps)
Larc Spies
Andy Dinwiddie (voice) (1 eps)
Jesse Borrego
Luis Cepeda (voice) (1 eps)
Kerrigan Mahan
Del Stone (voice) (1 eps)
Rip Taylor
Mr. Wackypants (voice) (1 eps)
Jason Harris
Flapjack / Announcer (voice) (1 eps)
Josh Peck
Damian / Kid / Zombie Kid #2 (voice) (1 eps)
Chris Klug
Self (voice) (1 eps)
Mimi Rogers
Maura Ravenmane / Helga (voice) (1 eps)
Daryl Sabara
Tommy / Steve (voice) (1 eps)
Matt Levin
Ticket Taker / Matt (voice) (1 eps)
David Faustino
Curt Crunch (voice) (1 eps)
Laraine Newman
Wor-El (voice) (1 eps)
Corey Burton
Gusano Grande (voice) (1 eps)
Jess Harnell
Lute Player / Shane Flinty / Constable (voice) (1 eps)
Beng Spies
Murph / Randy Dinwiddie (voice) (1 eps)
Irene Bedard
Cody Long (voice) (1 eps)
Michael Horse
Leon Strongfeather (voice) (1 eps)
Billy West
Jimmy Proudwolf (voice) (1 eps)
Vanessa Marshall
Danica LeBlake (voice) (1 eps)
Jim Belushi
Asa Buckwald (voice) (1 eps)
Kathy Kinney
Sheriff Ellen Perkins (voice) (1 eps)
Peter Scolari
Professor Higginson (voice) (1 eps)
M. Emmet Walsh
Jeb (voice) (1 eps)
Teri Garr
Sandy Gordon (voice) (1 eps)
Bill Mumy
Harry Noze (voice) (1 eps)
Eddie Santiago
Chip Hernandez, Jr. (voice) (1 eps)
Gedde Watanabe
Vincent Wong (voice) (1 eps)
Kathy Griffin
Autumn Summerfield (voice) (1 eps)
Mike Piazza
Self (voice) (1 eps)
Clyde Kusatsu
Dr. Akira Onodera / Fisherman / Desk Clerk (voice) (1 eps)
Mako
The Ancient One (voice) (1 eps)
Gwendoline Yeo
Lt. Keiko Tanaka (voice) (1 eps)
Benito Martinez
Horatio Hidalgo (voice) (1 eps)
Jonathan Osser
Billy Blather (voice) (1 eps)
Diedrich Bader
Uncle Evan (voice) (1 eps)
Jenny McCarthy-Wahlberg
Marcy (voice) (1 eps)
Rhea Perlman
Agnes (voice) (1 eps)
Paul Stanley
Self (voice) (1 eps)
Julia Sweeney
Aunt Meg (voice) (1 eps)
DeeDee Rescher
Sylvie (voice) (1 eps)
Ryan Sheckler
Self (voice) (1 eps)
Nika Futterman
Rutie Banez (voice) (1 eps)
Maurice LaMarche
Haze Ferlenguini / Security Guy (voice) (1 eps)
Pierre Bouvier
Self (voice) (1 eps)
Chuck Comeau
Self (voice) (1 eps)
David Desrosiers
Self (voice) (1 eps)
Sébastien Lefebvre
Self (voice) (1 eps)
Jeff Stinco
Self (voice) (1 eps)
Vince Corazza
Zeke Zillion (voice) (1 eps)
Susanne Blakeslee
Penelope Bailey (voice) (1 eps)
Larry Drake
Moss T. Meister / Burglar #2 / Scooby Snax Monster (voice) (1 eps)
Eva Almos
Captain Corvina Cloyd (voice) (1 eps)
Mikey Kelley
Monroe Hopper (voice) (1 eps)
Kathy Nagler
Sergeant Linda Rauch (voice) (1 eps)
Paul Julian
Road Runner (voice) (archive footage) (uncredited) (1 eps)
Pat Fraley
Uncle Karl (voice) (1 eps)
James Horan
Dr. Fleg / Bandit (voice) (1 eps)
Joey Lauren Adams
Rachel (voice) (1 eps)
Dan Castellaneta
Officer McBride / Police Officer (voice) (1 eps)
Harland Williams
George (voice) (1 eps)
JC Chasez
Self (voice) (1 eps)
Simon Petrie
Jonas Sulk / Demon Farmer (voice) (1 eps)
Jill Talley
Frida Flora (voice) (1 eps)
Ron Perlman
Inspector Malpumpkin / Joe / Frozen Fiend (voice) (1 eps)
Brett Hull
Self (voice) (1 eps)
Miranda Cosgrove
Miranda Wright / Stacy (voice) (1 eps)
Stacie Chan
Alex (voice) (1 eps)
Tara Lipinski
Grey (voice) (1 eps)
Denzel Whitaker
Jake / Kid (voice) (1 eps)
James Sie
Louie Hong Fa (voice) (1 eps)
Victoria Bruno
Cindy (voice) (1 eps)
Rodger Bumpass
Announcer / Steve (voice) (1 eps)
Steve Harwell
Self (voice) (1 eps)
Ben Diskin
Benji / Travis / Zombie Kid #1 (voice) (1 eps)
Khary Payton
Mitch (voice) (1 eps)