William Devane as President John F. Kennedy

Ralph Bellamy as U.N. Ambassador Adlai Stevenson

Howard Da Silva as Soviet Premier Nikita Khrushchev

James Hong as U.N. Secretary-General U Thant

Martin Sheen as Attorney General Robert F. Kennedy

James T. Callahan as David Powers, Special Assistant to the President

Peter Canon as Admiral's Aide

Keene Curtis as John McCone, Director CIA

Charles Cyphers as Press Photographer

Clifford David as Theodore Sorensen, Special Counsel

Francis De Sales as Senator

John Dehner as Former Secretary of State Dean Acheson

Peter Donat as David Ormsby-Gore, British Ambassador to U.S.

Andrew Duggan as Gen. Maxwell Taylor, Army Chief of Staff

Richard Eastham as Gen. David M. Shoup, USMC Commandant

Robert P. Lieb as Gen. Curtis LeMay - Air Force Chief of Staff