David Seville/Alvin Seville/Simon Seville
Ross Bagdasarian, Jr.
Theodore Seville / Brittany Miller / Jeanette Miller / Eleanor Miller
Janice Karman
Miss Rebecca Miller
Dody Goodman
Claudia Furschtien
Susan Tyrrell
Klaus Furschtien
Anthony De Longis
Sophie / Additional Voices
Frank Welker