Bob Newhart

Character: Bernard (voice)

Eva Gabor

Character: Miss Bianca (voice)

Geraldine Page

Character: Madame Medusa (voice)

Joe Flynn

Character: Mr. Snoops (voice)

Jeanette Nolan

Character: Ellie Mae (voice)

Pat Buttram

Character: Luke (voice)

Jim Jordan

Character: Orville (voice)

John McIntire

Character: Rufus (voice)

Michelle Stacy

Character: Penny (voice)

Bernard Fox

Character: The Chairman (voice)

Larry Clemmons

Character: Gramps (voice)

James MacDonald

Character: Evinrude / Brutus / Nero (voice)

George Lindsey

Character: Rabbit (voice)

Bill McMillian

Character: TV Announcer (voice)

Dub Taylor

Character: Digger (voice)

John Fiedler

Character: Owl (voice)

Robie Lester

Character: Miss Bianca (singing voice, uncredited)

Peter Renaday

Character: American Deligate (voice) (uncredited)