- William Frederick Cody as The Cat in the Hat
- Evelyn Hastings as Sarah Hall-Small
- Wild Bill Hickock as Mack the Turtle
- Denny Russell as Cindy Lou Who
- Rance Hastings as Sam-I-Am
- Jim Bridger as Horton the Elephant
- Red Barrett as Mr. Brown
- Joe Cooper as Joey
- Pemberton as The Lorax
- Sergeant Russell as King Derwin
- Chief Yellow Hand as Thidwick the Big-Hearted Moose
- Miller as Conrad
- Harvey as Sylvester McMonkey McBean
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