Ross Bagdasarian, Jr.

David Seville / Alvin Seville / Simon Seville (voice)

Janice Karman

Theodore / Brittany / Jeanette / Eleanor (voice)

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)