- Happy as The Cat in the Hat
- Monique as Daisy-Head Mayzie
- Paula Schneider as Sarah-Hall Small
- Hilde as Cindy Lou Who
- Lieutenant Dick Rennick as Horton the Elephant
- Colonel Devlin as The Grinch
- Heinz Scholtz as Joey
- Oberst (Colonel) von Ecker as Harold as Sam-I-Am
- Klaus Kinski as Mr. Knox
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