- John Robie as The Cat in the Hat
- Frances Stevens as Sarah Hall-Small
- Jessie Stevens as Joan
- H. H. Hughson as Sam-I-Am
- Bertani as King Derwin
- Danielle Foussard as Cindy Lou Who
- Foussard as Norval the Fish
- Germaine as Pam-I-Am
- Alfred Hitchcock as The Grinch (cameo)
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