- Laura Reynolds as Sarah Hall-Small
- Dr. Edward Hewitt as The Cat in the Hat
- Claire Hewitt as Joan
- Cos Erickson as Sam-I-Am
- Ward Hendricks as Mack the Turtle
- Larry Brant as Norval the Fish
- Judge Thompson as King Derwin
- Walter Robinson as Nick
- Paul Sutcliff as Thidwick the Big-Hearted Moose
- Danny Reynolds as Little Cat A
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