- John Longridge as The Cat in the Hat
- Professor James Hunter as Mack the Turtle
- Nancy Hunter as Sarah Hall-Small
- Elizabeth Hunter as Cindy Lou Who
- Peter Hunter as Horton the Elephant
- The Hermit as Norval the Fish
- James MacKenzie as King Derwin
- Nell MacKenzie as Gertrude McBird
- Mrs. Oakes as Daisy-Head Mayzie
- Bert Oakes as Morton the Elephant Bird
- Bodger as Sam-I-Am
- Luath as Joey
- Tao as Mr. Brown
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