| Butch Patrick | Milo |
| Mel Blanc | Officer Short Shrift / The Word Speller / The Dodecahedron / The Demon of Insincerity |
| Daws Butler | Whether Man |
| Candy Candido | Awful DYNN |
| Hans Conried | King Azaz / The MathemaGician |
| June Foray | Ralph / The Which / Princess of Pure Reason |
| Patti Gilbert | Princess of Sweet Rhyme |
| Shepard Menken | Tick Tock the Watch Dog |
| Cliff Norton | Spelling Bee / Senses Taker |
| Larry Thor | Kakofonous A. Dischord |
| Les Tremayne | Humbug |
| Michael Earl | Milo's Friend |
| Director | Chuck Jones; Abe Levitow |
| Producer | Chuck Jones; Abe Levitow |
| Writer | Chuck Jones; Norton Juster |
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