William Devane

as John

as John F. Kennedy - US President

as Greg Sumner / Gregory Sumner

as President James Heller

as Dean Sanderson Sr.

as Leonard Doc Blach

Self

as Big Red

as Pop O'Hara

as Edward Grayson

as Jake

as Everett Morgan Gray

as Dutch Hines

as Dr. Dix

as Thompson

as Victor Gatling

as Alan Beckett

as Frank Carson

as Judge Stanley Seeban

as Billy Crumb

as Gregory Sumner

Self

as Grove McCarthy

as Col. Weldon

as The Judge

as George Boyajian

as Roger Thornhill

as Dr. Kramer

as Eugene Davis

as Ron Lake

as Tom Kincaid

as Brady McKay

as Older Sam Ryan

as Carter

as Sergeant Joseph Turk

as Voice over

as Sen. Emmett Hunter

as Dr. Karl Sorenson

as Lawrence Kellerman

as Narrator

as Dr. Richard Ofshe

as John Monroe

as Capt. Bob Pearson

as Nick Caldwell

as Dr. Harbuck

as Tom

Actor

as Lt. Barrett

as Lou Del La Rosa

as Daniel 'Dan' Fields

as Harry Orwitz

as Gregory Sumner

as Ed Bledsoe

as Elliot McSwain

as Self - Host & Narrator

as Black Jack Bouvier

as Sheriff Jim Metts

as Alex Brandt

as Dr. Chatham

as Jack Litman