Character Name : Alvin / Simon / David Seville (voice)

Original Name : Ross Bagdasarian, Jr.

Gender : Male

Character Name : Theodore / Tommy's Sister (voice)

Original Name : Janice Karman

Gender : Male

Character Name : Santa Claus / Doctor (voice)

Original Name : Frank Welker

Gender : Male

Character Name : Clyde Crashcup (voice)

Original Name : Charles Berendt

Gender : Male

Character Name : Tommy Waterford (voice)

Original Name : R.J. Williams

Gender : Male

Character Name : Mrs. Waterford / Mrs. Claus

Original Name : June Foray

Gender : Female