• Mario as The Cat in the Hat
  • Princess Rosalina as Joan
  • Princess Peach as Sally
  • Luigi as Conrad
  • Bowser as Larry Quinn
  • Wario as Larry's Claw
  • Larry Koopa and Lemmy Koopa as Thing #1 and Thing #2
  • Waluigi as Mr. Humberfloob
  • Toadsworth as Narrator
  • Toadbert as Announcer
  • Wendy O. Koopa as Mrs. Kwan
  • Yoshi as Fish
  • Nabbit as Nevins
  • Toad as Locker

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