Allan Sherman

The Cat in the Hat (voice)

Daws Butler

Mr. Krinklebein the Fish (voice)

Pamelyn Ferdin

Sally (voice)

Tony Frazier

Boy (voice)

Gloria Camacho

Mother (voice)

Thurl Ravenscroft

Thing 1 (voice)

Gene Morford

Thing 2 (voice) (as Lewis Morford)