Alvin / Simon / David Seville (voice)
Ross Bagdasarian, Jr.
Theodore / Tommy's Sister (voice)
Janice Karman
Santa Claus / Doctor (voice)
Frank Welker
Clyde Crashcup (voice)
Charles Berendt
Tommy Waterford (voice)
R.J. Williams
Mrs. Waterford / Mrs. Claus
June Foray
Writer
Character Designer
Chuck Jones
Director
Phil Monroe
Story
Hal Mason
Background Designer
Toby Bluth
Production Design