- Inspector Jacques Clouseau as The Cat in the hat
- David Niven as Sam-I-Am
- Herbert Lom as Mack the Turtle
- Marie Jouvet as Daisy-Head Mayzie
- Cato as Mr. Brown
- Bruno Langlois as The Grinch
- Professor Balls as King Derwin
- Lady Litton as Cindy Lou Who
- Clouseau Senior as Joey
- Francois Duval as Gertrude McFuzz
- Hercule LaJoy as Sylvester McMonkey McBean
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