- Major James Wilson as The Cat in the Hat
- Captain Owen Franklin as Sam-I-Am
- Sue Wilson as Sarah Hall-Small
- Lieutenant Commander Donald Kimberly as Mack the Turtle
- Rear Admiral Sir Frederick Grafton as Sylvester McMonkey McBean
- Forrester as Joey
- Lieutenant Graham as King Derwin
- Col. von Horst as Norval the Fish
- Admiral of the Fleet Lord William Cansley as Thidwick the Moose
- Capt. Erich Stasser as The Lorax
- Air Vice Marshall Woodbridge as Mr. Brown
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