as President Thomas J. Whitmore
as David Levinson
as First Lady Marilyn Whitmore
as Julius Levinson
as U.S. Space Command General William Grey
as Russell Casse
as Constance Spano/Levinson
as Secretary of Defense Albert Nimzicki
as Marty Gilbert
as Major Mitchell
as Dr. Brakish Okun
as Miguel Casse
as Video Newscaster