- Charlie Chan as The Cat in the Hat
- Yvonne Roland as Sarah Hall-Small
- Betty Adams as Cindy Lou Who
- Richard Masters as Mack the Turtle
- Lee Chan as Sam-I-Am
- Arthur Hughes as Horton the Elephant
- Mr. Cartwright as King Derwin
- Charlie Chan, Jr. as The Lorax
- Mr. Hopkins as Mr. Brown
- Honorable Charles Zaraka as Norval the Fish
- Inspector Strasser as Joey
- Dr. Burton as Thidwick the Big-Hearted Moose
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