Ross Bagdasarian, Jr.
David Seville / Alvin Seville / Simon Seville (voice)
Janice Karman
Theodore Seville / Brittany Miller / Jeanette Miller / Eleanor Miller
Dody Goodman
Miss Rebecca Miller (voice)
Susan Tyrrell
Claudia Furschtien (voice)
Anthony De Longis
Klaus Furschtien (voice)
Frank Welker
Sophie / Native Chief / Baby Penguin / Additional Voices (voice)
Nancy Cartwright
Arabian Prince (voice)
Philip L. Clarke
Additional Voices (voice)
Ken Sansom
Inspector Jamal (voice)
George Poulos
Additional Voices (voice)
Charlie Adler
Additional Voices (voice)
Patrick Pinney
Additional Voices (voice)
Jack Angel
Additional Voices (voice; uncredited)
Mel Blanc
Additional Voices (voice; uncredited)
Laura Summer
Additional Voices (voice; uncredited)