Francesca Marie Smith

as Mayzie McGrew (voice)

Henry Gibson

as Cat in the Hat (voice)

Tim Curry

as Finagle (voice)

George Hearn

as Mayor (voice)

Lewis Arquette

as Principal (voice)

Jonathan Winters

as Dr. Eisenbart (voice)

Susan Silo

as Miss Sneetcher (voice)

B.J. Ward

as Mrs. McGrew (voice)

Paul Eiding

as Mr. McGrew (voice)

Robert Ridgely

as Finch (voice)

Ben Smith

as Butch (voice)

John Christian Graas

as Einstein (voice)

Beth Andersen

as Background Singer (voice)

Donna Medine

as Background Singer (voice)