Harvey Birdman, Attorney at Law

Thomas Allen

Peanut (voice)

John Michael Higgins

Mentok the Mindtaker (voice)

Chris Edgerly

Peter Potamus (voice)

Gary Cole

Judge Hiram Mightor (voice), Harvey Birdman (voice)

Peter MacNicol

X the Eliminator (voice)

Paget Brewster

Birdgirl (voice)

Stephen Colbert

Phil Ken Sebben / Myron Reducto (voice), Fed #2 (voice), Pirate (voice), Civilian #1 / Juror (voice), FBI (voice; uncredited)

Bill Farmer

Secret Squirrel (voice)

Paul Adelstein

Michael McKean

Evelyn Spyro Throckmorton (voice)

Nika Futterman

Patience Cleveland

Mark Hamill

Ricochet Rabbit (voice)

Neil Ross

Dr. Benton C. Quest / Vulturo (voice)

Mary Birdsong

Debi Mae West

Rob Paulsen

Toby Huss

Kym Whitley

Robert Osborne

Diane Michelle

Lewis Black

The Deadly Duplicator (voice)

Wally Wingert

Hadji (voice)

Billy West

Dr. Zin (voice)

Scott Innes

Shaggy Rogers / Scooby-Doo / Scrappy-Doo / Prisoner #1 (voice)

Phil LaMarr

Black Vulcan / Civilian #2 (voice), FEAR #2 / Black Vulcan (voice)

Jack Angel

General / Drunk Man / Additional Voices (voice)

Michael Bell

Zan (voice)

Laraine Newman

Sybil Scussler / Mrs. Debbie (voice)

Steve Landesberg

Bailiff (voice), Doctor Quincy (voice), Grok (voice)

Jeff Bergman

George Jetson / Bakov / Clown (voice)

B.J. Ward

Velma Dinkley (voice)

Maurice LaMarche

Azul Falcone (voice), Azul Falcone / Stan Freezoid (voice), Fred Flintstone / Bird / Can Opener (voice), Apache Chief / Announcer (voice), Yogi Bear (voice)

Tom Kenny

Top Cat (voice), Elroy (voice), Boo Boo (voice)

Dee Bradley Baker

Jonny Quest / Lizardman / Avenger (voice), Forensic Pathologist / Foreman / Lizardman (voice)

Frank Welker

Jabberjaw (voice), Fred Jones / Avenger / Robot (voice), Jabberjaw / Biff (voice), Avenger / Fed #1 / Juror (voice)

Jeanne Mori

Seiko / Miko (voice)

Toshi Toda

Shoyu Weenie's Manager (voice)

Tress MacNeille

Wilma Flintstone / Pebbles Flintstone (voice)

Doug Preis

Thundarr (voice)

Kevin Michael Richardson

Barney Rubble (voice)

Grey DeLisle

Debbie (voice), Receptionist (voice), Dr. Gale Melody / Debbie (voice), Debbie / DMV Operator / X's Wife (voice), Daphne Blake / Mrs. Debbie (voice)

Carol Bach Rita

Operator (voice), Talia (voice)

Joe Alaskey

FEAR #1 / Peter Potamus (voice), Peter Potamus / Employee (voice)

David Kaye

Officer (voice), Announcer / Officer (voice)

André Sogliuzzo

Dynomutt / Avenger / Pope (voice), Dynomutt / Avenger / Co-Worker (voice)