Ralph / Scribble (22 episodes, 1998-1999)
Dog Zero / Leonardo da Vinci (22 episodes, 1998-1999)
Additional Voices (22 episodes, 1998-1999)
Mitzy / Timmy (21 episodes, 1998-1999)
Additional Voices (13 episodes, 1998-1999)
Catastrophe / Von Rabie / Flea Leader / Bank Robbers / Saber-Toothed Mouse (11 episodes, 1998-1999)
Angus (11 episodes, 1998-1999)
Chukchi / Fleas / Furry / Space Slug / Counterfeiters / Hatchet / Old Man / Stinky Pie / William Shakespeare (9 episodes, 1998-1999)
Additional Voices (9 episodes, 1999)
Frank / Big Jim Jones / Sir William (4 episodes, 1998-1999)
Al Catraz / Dave / Dog Inmate #1 / Dog Inmate #2 / Egyptian Dog / Film Narrator / Italian Dog / Man (4 episodes, 1999)
Space Slug / Christopher Columbus (3 episodes, 1998-1999)
Stahl (3 episodes, 1998-1999)
Arty's Mom / Little Arty (2 episodes, 1999)
Baron Bone (1 episode, 1998)
Oatz Couture (1 episode, 1998)
D'Cell (1 episode, 1998)
Additional Voices (1 episode, 1998)
Ernst Stavro Blowfish (1 episode, 1998)
Anubis (1 episode, 1998)
Mistress Pavlov (1 episode, 1999)
Jill (1 episode, 1999)
Captain Earwig / Virgil (1 episode, 1999)
Frank's Owner (1 episode, 1999)
Granny Larceny (1 episode, 1999)
Santa Claus (1 episode, 1999)
Additional Voices (1 episode, 1999)
Additional Voices (unknown episodes)