Walker Boone
Mario (voice) (26 eps)
Tony Rosato
Luigi (voice) (26 eps)
Tracey Moore
Princess Toadstool (voice) (26 eps)
Harvey Atkin
King Koopa (voice) (26 eps)
John Stocker
Toad (voice) (26 eps)
Dan Hennessey
Bully Koopa (voice) (26 eps)
Tara Strong
Hip Koopa / Hop Koopa (voice) (26 eps)
Tabitha St. Germain
Kootie-Pie Koopa (voice) (26 eps)
James Rankin
Cheatsy Koopa (voice) (26 eps)
Michael Stark
Kooky Koopa (voice) (26 eps)
Gordon Masten
Big Mouth Koopa (voice) (26 eps)
Bonnie Brooks
Additional Voices/Mushroom Nanny (voice) (26 eps)
Fab Morvan
Fabrice of Milli Vanilli (uncredited) (1 eps)
Rob Pilatus
Rob of Milli Vanilli (uncredited) (1 eps)