David Seville / Alvin Seville / Simon Seville (voice)

Ross Bagdasarian, Jr.

Acting

Theodore / Brittany / Jeanette / Eleanor (voice)

Janice Karman

Acting

Miss Rebecca Miller (voice)

Dody Goodman

Acting

Claudia Furschtien (voice)

Susan Tyrrell

Acting

Klaus Furschtien (voice)

Anthony De Longis

Acting

Sophie / Native Chief / Baby Penguin / Additional Voices (voice)

Frank Welker

Acting

Arabian Prince (voice)

Nancy Cartwright

Acting

Additional Voices (voice)

Philip L. Clarke

Acting

Inspector Jamal (voice)

Ken Sansom

Acting

Additional Voices (voice)

George Poulos

Acting

Additional Voices (voice)

Charlie Adler

Acting

Additional Voices (voice)

Patrick Pinney

Acting

Additional Voices (voice; uncredited)

Jack Angel

Acting

Additional Voices (voice; uncredited)

Mel Blanc

Acting

Additional Voices (voice; uncredited)

Laura Summer

Acting