Jeff Bennett
Dad (voice) (221 eps)
Kath Soucie
Mom (voice) (221 eps)
Christine Cavanaugh
Dexter (voice) (183 eps)
Kat Cressida
Dee Dee (voice) (146 eps)
Candi Milo
Dexter (voice) (75 eps)
Allison Moore
Dee Dee (voice) (75 eps)
Eddie Deezen
Mandark (voice) (75 eps)
Dom DeLuise
Koosalagoopagoop (voice) (4 eps)
Frank Welker
Dynomutt / Dynomutt X90 (voice) (2 eps)
Randy Savage
Rasslor (voice) (1 eps)
Paul Williams
Professor Williams (voice) (1 eps)
Gary Owens
Blue Falcon (voice) (1 eps)
Agostino Castagnola
Doctor / Narrator (voice) (1 eps)
Tom Kenny
Peepers (voice) (1 eps)
Martin Mull
M.A.R. 10 (voice) (1 eps)
Fred Willard
F.R.E.D. (voice) (1 eps)
Mark Hamill
Magic Uncle Fergel O'Reilly (voice) (1 eps)
Michael Dorn
Robo Dexo 3000 (voice) (1 eps)
Earl Boen
General (voice) (1 eps)
Andy Suriano
Andy Suriano (voice) (1 eps)