- Gregory Anton as The Cat in the Hat
- Paula Alquist Anton as Sarah Hall-Small
- Brian Cameron as Mack the Turtle
- Miss Bessie Thwaites as Cindy Lou Who
- Nancy Oliver as Pam-I-Am
- Elizabeth Tompkins as The White-Tufted Floozle Bird
- Maestro Guardi as Sam-I-Am
- General Huddleston as Thidwick the Moose
- Mr. Mufflin as The Lorax
- PC Williams as Horton the Elephant
- Lady Mildred Dalroy as Daisy-Head Mayzie
- Lord Freddie Daloy as Sylvester McMonkey McBean
- The Pianist as Conrad
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