Cast
- James Arnold Taylor as Jonathan "Johnny" Test, Hank Anchorman, Principal Jules Harm, Mr. Mittens, Bee Keeper, Dark Vegan, Dog Catcher
- Louis Chirillo as Dukey, Mr. Henry Teacherman (Seasons 1-4)
- Trevor Devall as Dukey, Mr. Henry Teacherman (Season 5)
- Maryke Hendrikse as Susan Test, Jillian Vegan
- Brittney Wilson as Mary Test, Sissy Blakely (Seasons 1 and 5), Missy (Season 5)
- Ashleigh Ball as Mary Test, Sissy Blakely, Missy (Seasons 2-4)
- Ian James Corlett as Hubert "Hugh" Test
- Kathleen Barr as Lillian "Lila" Test, Janet Nelson Jr., Blast Ketchup
- Bill Mondy as Mr. Black, Brain Freezer
- Scott McNeil as Mr. White, Zizrar, Bumper Randalls
- Andrew Francis as Gil Nexdor, Tim Burnout
- Lee Tockar as Eugene "Bling-Bling Boy" Hamilton, General, Mayor Howard, Mr. Wacko, Montague, Albert
- Richard Newman as Professor Slopsink
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