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- Tony Toponi as Horton
- Jimmy as The Mayor of Who-ville
- Gussie Mausheimer as Mrs. Quilligan
- Honest John as Morton
- Bridget as Katie
- Mama Mousekewitz as Sally
- Miss Kitty [from An American Tail: Fievel Goes West] as Kangaa
- Fievel Mousekewitz as Kangaa's son
- Fred [from Scooby Doo] as The King Monkey
- Cat R. Waul [from An American Tail: Fievel Goes West] as Vlad
- Wilma and Betty [from The Flintstones] Hedy and Hooly
- Little Miss Calamity [from The Mr. Men Show] as Helen
- Wylie Burp [from An American Tail: Fievel Goes West] as Jojo