- Robert Angier as The Cat in the Hat
- Alfred Borden as King Derwin
- John Cutter as Sam-I-Am
- Julia McCullough as Pam-I-Am
- Sarah Borden as Joan
- Olivia Wenscombe as Sarah Hall-Small
- Nikola Tesla as Mack the Turtle
- Mr. Alley as Little Cat Fleep
- "Milton the Magician" as Norval the Fish
- Mr. Meredith as The Grinch
- The Judge as Thidwick the Moose
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