 Butch PatrickMilo | Milo |
 Mel BlancOfficer Short Shrift / Dodecahedron / Demon of Insincerity (voice) | Officer Short Shrift / Dodecahedron / Demon of Insincerity (voice) |
 Daws ButlerWhether Man / Senses Taker / Terrible Trivium / Gelatinous Giant (voice) | Whether Man / Senses Taker / Terrible Trivium / Gelatinous Giant (voice) |
 Candy CandidoAwful DYNN (voice) | Awful DYNN (voice) |
 Hans ConriedKing Azaz / The MathemaGician (voice) | King Azaz / The MathemaGician (voice) |
 June ForayRalph / Faintly Macabre / Princess of Pure Reason (voice) | Ralph / Faintly Macabre / Princess of Pure Reason (voice) |
| PPatti GilbertPrincess of Sweet Rhyme (voice) | Princess of Sweet Rhyme (voice) |
 Shepard MenkenSpelling Bee / Chroma (voice) | Spelling Bee / Chroma (voice) |
 Cliff Nortonakofonous A. Dischord / Tollbooth Speaker (voice) | akofonous A. Dischord / Tollbooth Speaker (voice) |
 Larry ThorTock the Watchdog (voice) | Tock the Watchdog (voice) |
 Les TremayneHumbug (voice) | Humbug (voice) |
| MMichael EarlRalph (uncredited) | Ralph (uncredited) |
 Chuck JonesCable Car Passenger (uncredited) | Cable Car Passenger (uncredited) |
 Thurl RavenscroftLethargian (voice, uncredited) | Lethargian (voice, uncredited) |
