- Charlie Adler
- Â I.R. Baboon / ... 79 episodes, 1997-1999
- Michael Dorn
- Â I.M. Weasel / ... 79 episodes, 1997-1999
- Tom Kenny
- Â Additional Voices / ... 14 episodes, 1997-1999
- Dee Bradley Baker
- Â Dad / ... 10 episodes, 1998-1999
- Candi Milo
- Â Teacher / ... 6 episodes, 1998-1999
- Dan Castellaneta
- Â Earl / ... 5 episodes, 1998-1999
- Susanne Blakeslee
- Â Loulabelle / ... 4 episodes, 1998
- Howard Morris
- Â Flem / ... 4 episodes, 1998-1999
- Michael Gough
- Â Admiral Bullets / ... 3 episodes, 1997-1998
- Dom DeLuise
- Â Frenchman #3 / ... 3 episodes, 1997-1999
- Kevin Schon
- Â Hyena / ... 3 episodes, 1998
- Marabina Jaimes
- Â Baboon's Sister / ... 3 episodes, 1997-1998
- Frank Welker
- Â Coyote / ... 3 episodes, 1999
- Gregg Berger
- Â Mr. Draftsman / ... 2 episodes, 1997-1999
- Jennifer Hale
- Â Gertrude / ... 2 episodes, 1998
- Pat Musick
- Â Air Traffic Controller / ... 2 episodes, 1997-1998
- David Feiss
- Â Additional voices / ... 2 episodes, 1998-1999
- Jill Talley
- Â Woman 2 episodes, 1999
- Jeremy Piven
- Â American Football Star 1 episode, 1997
- Bronson Pinchot
- Â Guard / ... 1 episode, 1997
- Jess Harnell
- Â Admiral Bullets / ... 1 episode, 1997
- Susan Tyrrell
- Â Madame DeBarge 1 episode, 1997
- DeeDee Rescher
- Â Baboon's Mom 1 episode, 1997
- Kerrigan Mahan
- Â Announcer / ... 1 episode, 1997
- Kevin Michael Richardson
- Â Birch / ... 1 episode, 1998
- Tom Kane
- Â Anchor Man 1 episode, 1998
- Melissa Disney
- Â Judge / ... 1 episode, 1998
- Bruce McGill
- Â Baboon's Dad / ... 1 episode, 1997
- Laraine Newman
- Â Girl 1 episode, 1997
- Antoinette Spolar
- Â Fan / ... 1 episode, 1997
- Teresa Ganzel
- Â Loulabelle 1 episode, 1998
- Jeff Doucette
- Â Fat Farmer / ... 1 episode, 1998
- Thurl Ravenscroft
- Â I.M. Weasel 1 episode, 1999
- Jill Kenny
- Â Little Girl / ... 1 episode, 1999
- Fred Stoller
- Â Lonely Man 1 episode, 1997
- Gail Matthius
- Â Nurse / ... 1 episode, 1997
- Heidi Shannon
- Â Female #2 / ... 1 episode, 1997
- Bob Miller
- Â Man / ... 1 episode, 1997
- Peter Lurie
- Â Head Farmer 1 episode, 1998
- Jennifer Martin
- Â Blind Date 1 episode, 1998
- Merrill Ward
- Â Announcer / ... 1 episode, 1998
- David Lodge
- Â Doolunch / ... 1 episode, 1997
- Marianne Muellerleile
- Â Farmer Wife / ... 1 episode, 1998
- Richard Steven Horvitz
- Â Beaver #2 / ... 1 episode, 1997
- Carlos Alazraqui
- Â Beaver #1 / ... 1 episode, 1997
- Nora Dunn
- Â Bearded Girl / ... 1 episode, 1997
- Ed McMahon
- Â Eugene Oregon 1 episode, 1997
- Tony Pope
- Â Boy / ... 1 episode, 1997
- Mari Weiss
- Â Big Lady / ... 1 episode, 1997
- Lauri Fraser
- Â Girl / ... 1 episode, 1997
- Scott Weil
- Â Carl 1 episode, 1997
- Mark Hamill
- Â Yellow Haired Guest 1 episode, 1998
- Billy West
- Â Bag Boy / ... 1 episode, 1998
- Jeff Bennett
- Â Dog Catcher 1 episode, 1998
- Kath Soucie
- Â Squirrel / ... 1 episode, 1998
- Marcia Wallace
- Â Old Woman / ... 1 episode, 1998
- Rob Paulsen
- Â Admiral Algebra Doll / ... 1 episode, 1998
- Mary Kay Bergman
- Â Sandy Weasel 1 episode, 1998
- Earl Boen
- Â Ben Franklin / ... 1 episode, 1998
- John Kassir
- Â Asp / ... 1 episode, 1998
- Quinton Flynn
- Â Beaver #1 / ... 1 episode, 1998
- Paul Eiding
- Â Patient #1 / ... 1 episode, 1998
- Neil Dickson
- Â Banana 1 episode, 1998
- Susan Tolsky
- Â Betsy Ross / ... 1 episode, 1998
- B.J. Ward
- Â Betty / ... 1 episode, 1998
- Townsend Coleman
- Â Hector / ... 1 episode, 1998
- Ed Gilbert
- Â Announcer / ... 1 episode, 1998
- Dionne Quan
- Â Girl 1 episode, 1998
- S. Marc Jordan
- Â George Washington / ... 1 episode, 1998
- Phyllis Diller
- Â Red's Mother 1 episode, 1999
- Dick Gautier
- Â Barber / ... 1 episode, 1999
- Vanessa Marshall
- Â Beautician 1 episode, 1999