- Frank Welker
- Garfield / Garzooka / Monster / Narrator / Spike Guard / Kung Fu Guard / Dog / Lawyer / Keith / Computer Voice (voice)
- Vanessa Marshall
- Vetvix
- Gregg Berger
- Odie / Odious (voice)
- Wally Wingert
- Jon / Emperor Jon (voice)
- Audrey Wasilewski
- Arlene / Starlena (voice)
- Jason Marsden
- Nermal / Abnermal (voice)
- Fred Tatasciore
- Billy / Horned Guard (voice)
- Stephen Stanton
- Randy / News Guy / Skinny Guard (voice)
- Jennifer Darling
- Bonita / Betty (voice)
- Neil Ross
- Wally / Professor Wally / Charles (voice)
- Greg Eagles
- Eli
- Cathy Cavadini
- Additional Voices
- Paige Pollack
- Additional Voices
- David Michie
- Additional Voices
- Greg Finley
- Additional Voices
- Ruth Zalduondo
- Additional Voices
- Jeff Fischer
- Additional Voices