- Leona Stevenson as Sarah Hall-Small
- Henry J. Stevenson as King Derwin
- Sally Hunt Lord as Cindy Lou Who
- Dr. Philip Alexander as The Cat in the Hat
- Waldo Evans as Little Cat A
- James Cotterell as Norval the Fish
- Fred Lord as Mack the Turtle
- Morana as Horton the Elephant
- Joe as Sam-I-Am
- Peter Lord as The Grinch
- Elizabeth Jennings as The White-Tufted Floozle Bird
- Harpootlian as The Lorax
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