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) Rodger Bumpass Additional Voices (voice) Robert Clotworthy Additional Voices (voice) Jennifer Darling 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)