- Colonel Thompson as The Cat in the Hat
- US Army Ranger as King Derwin
- Private Arthur "Dutch" Schultz as Mack the Turtle
- John Steele as Horton the Elephant
- Private Harris as Thidwick the Big-Hearted Moose
- Captain Frank as Sylvester McMonkey McBean
- US Army Ranger Major as Joey
- US Army Ranger as The Grinch
- Major General Robert Haines as Conrad
- Madame Barrault as Sally
- Maid as Pam-I-Am
- Brigadier General Theodore Roosevelt Jr. as Sam-I-Am
- and more
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