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| Rene Auberjonois | Professor Genius/The Nightmare King |
| Bever-Leigh Banfield | Woman |
| Michael Bell | Oompy |
| Nancy Cartwright | Page |
| Gabriel Damon | Little Nemo |
| Jennifer Darling | Nemo's Mother |
| Bernard Erhard | King Morphy Morpheus |
| June Foray | Librarian |
| Kathleen Freeman | Dance Teacher |
| Ellen Gerstell | Page |
| Michael Gough | 2nd Teacher |
| Sherry Lynn | Bon Bon |
| Tress MacNeille | Elevator Creature |
| Danny Mann | Icarus, the squirrel |
| Michael McConnohie | Etiquette Master |
| Laura Mooney | Princess Camille |
| Alan Oppenheimer | Oomp |
| Mickey Rooney | Flip |
| Neil Ross | Oompa |
| John Stephenson | Oompo |
| Beau Weaver | 1st Teacher |
A boy goes to the kingdom of Slumberland and then, Nightmare Land.
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