• Jimmy Neutron as Mario
  • Goddard as Baby Mario
  • Carl Wheezer as Luigi
  • Sheen Estevez as Baby Luigi
  • King Goobot V as Bowser
  • Ooblar as Baby Bowser
  • Cindy Vortex as Princess Peach
  • Libby Folfax as Baby Princess Peach
  • Mr. Neutron as Toadsworth
  • Mr. Wheezer as Young Toadsworth
  • Butch Pakovski as Professor E. Gadd
  • Ike Wolvermein as Young Professor E. Gadd
  • Grandma Taters as Princess Shroob
  • Yolkians as Shroobs

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