- Tom Rath as The Cat in the Hat
- Betsy Rath as Cindy Lou Who
- Ralph Hopkins as Mack the Turtle
- Maria Montagne as Gertrude McFuzz
- Judge Bernstein as King Derwin
- Helen Hopkins as Sarah Hall-Small
- Sgt. Caesar Gardella as Horton the Elephant
- Bill Hawthorne as Thidwick the Big-Hearted Moose
- Susan Hopkins as Jane Kangaroo
- Janey Rath as Daisy-Head Mayzie
- Gordon Walker as Morton the Elephant Bird
- Bill Ogden as The Grinch
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