- Terry Malloy as The Cat in the Hat
- Edie Doyle as Sarah Hall-Small
- Michael J. Skelly as Sam-I-Am
- Father Barry as Mack the Turtle
- Charley Malloy as Norval the Fish
- Timothy J. Dugan as Mr. Brown
- Joey Doyle as The Lorax
- Big Mac as Sylvester McMonkey McBean
- Maiden Sekulovich as King Derwin
- Lead Investigator for Crime Commission as Joey
- Gillette as Pam-I-Am
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