Michael Bell
— Opus the Penguin (voice)
Joe Alaskey
— Truffles / The Ducks (voice)
John Byner
— Bill (voice)
Tress MacNeille
— Chicken (voice)
Alexaundria Simmons
— Ronald-Ann (voice)
Andrew Hill Newman
— Milquetoast (voice)
Robin Williams
— Kiwi (voice) (credited as Sudy Nim)
Frank Welker
— Santa Claus (voice)