Jennifer Aniston

Annie Hughes (voice)

Harry Connick Jr.

Dean McCoppin (voice)

Vin Diesel

The Iron Giant (voice)

James Gammon

Foreman Marv Loach / Floyd Turbeaux (voice)

Cloris Leachman

Mrs. Lynley Tensedge (voice)

Christopher McDonald

Kent Mansley (voice)

John Mahoney

General Rogard (voice)

Eli Marienthal

Hogarth Hughes (voice)

M. Emmet Walsh

Earl Stutz (voice)

Jack Angel

Additional Voices (voice)

Bob Bergen

Additional Voices (voice)

Mary Kay Bergman

Additional Voices (voice)

Michael Bird

Additional Voices (voice)

Devon Cole Borisoff

Additional Voices (voice)

Rodger Bumpass

Additional Voices (voice)

Robert Clotworthy

Additional Voices (voice)

Jennifer Darling

Additional Voices (voice)

Zack Eginton

Additional Voices (voice)

Paul Eiding

Additional Voices (voice)

Bill Farmer

Additional Voices (voice)

Charles Howerton

Additional Voices (voice)

Ollie Johnston

Additional Voices (voice)

Sherry Lynn

Additional Voices (voice)

Mickie McGowan

Additional Voices (voice)

Ryan O'Donohue

Additional Voices (voice)

Phil Proctor

Additional Voices (voice)

Frank Thomas

Additional Voices (voice)

Patti Tippo

Additional Voices (voice)

Brian Tochi

Additional Voices (voice)

Carole Jeghers

Firefighter Woman (voice) (uncredited)