- Detective Sgt. Mark Dixon as The Cat in the Hat
- Morgan Taylor-Paine as Sarah Hall-Small
- Tommy Scalise as Sam-I-Am
- Detective Sgt. Paul Klein (Dixon's partner) as Norval the Fish
- Jiggs Taylor as Thidwick the Moose
- Detective Lt. Thomas as Joey
- Martha as Joan
- Steve as Yertle the Turtle
- Ernie as Little Cat A
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