Kevin Costner
Kenneth O'Donnell

Bruce Greenwood
John F. Kennedy

Steven Culp
Robert F. Kennedy

Dylan Baker
Robert McNamara

Michael Fairman
Adlai Stevenson

Henry Strozier
Dean Rusk

Frank Wood
McGeorge Bundy

Kevin Conway
Gen. Curtis LeMay

Tim Kelleher
Ted Sorensen

Len Cariou
Dean Acheson

Bill Smitrovich
Gen. Maxwell Taylor

Shawn Driscoll
U-2 Pilot

Drake Cook
Mark O'Donnell

Stephanie Romanov
Jacqueline Kennedy

Lucinda Jenney
Helen O'Donnell

Caitlin Wachs
Kathy O'Donnell

Jon Foster
Kenny O'Donnell, Jr.

Matthew Dunn
Kevin O'Donnell

Kevin O'Donnell
NPIC Photo Interpreter

Janet Coleman
Evelyn Lincoln

Bruce Thomas
Floyd

Dakin Matthews
Arthur Lundahl

Liz Sinclair
Kenny's Assistant #1

Colette O'Connell
Kenny's Assistant #2

Karen Ludwig
Operator Margaret

Audrey Rapoport
White House Operator #1

Marliese Schneider
White House Operator #2

Ed Lauter
Gen. Marshall Carter

Walter Adrian
Lyndon Johnson

James Karen
George Ball

Dan Ziskie
Gen. Walter 'Cam' Sweeney

Peter White
John McCone

Kelly Connell
Pierre Salinger

Olek Krupa
Andrei Gromyko

Ilya Baskin
Anotoly Dobrinyn

Timothy Jerome
Journalist

Jack McGee
Richard J. Daley

Lamar Smith
Aide

John Aylward
Orville Dryfoos

Madison Mason
Adm. George Anderson

Vivien Straus
White House Aide

Christopher Lawford
Cmdr. William B. Ecker

David O'Donnell
Lt. Bruce Wilhemy

Gene Del Bianco
Petty Officer

Benjamin Koldyke
RF-8 Pilot

Daniel Vergara
OAS Secretary General José A. Mora

Ruben Moreno
Argentine Diplomat

Thomas Roberts
Sonar Operator

Sean Bergin
Chief Sonarman

Alan Francis Sullivan
Executive Officer of USS Pierce

Robert Munstis
Radio Room Operator #1

Michael Gaston
Captain of USS Pierce

Joseph Repoff
Radio Room Operator #2

J. Tucker Smith
Captain of USS Kennedy

Chris Henry Coffey
Officer of Destroyer

Олег Видов
Valerian Zorin

Radu Gavor
Romanian Delegate

Zitto Kazann
Chilean Delegate

Alex Veadov
Radio Room Operator #3

Jack Blessing
John Scali

Tom Everett
Walter Sheridan

Karl Makinen
Young FBI Agent

Boris Lee Krutonog
Alexander Fomin

Charles Esten
Maj. Rudolf Anderson

Charles Barrett
Air Force NCO

Darryl Smith
Football Coach

Allan Graf
Football Referee

Robert Miranda
RFK's Driver

Todd Sible
RFK's Staffer

Marya Kazakova
Soviet Woman

Cliff Fleming
Aerial Coordinator

Craig Hosking
Pilot

Michael R. Bowman
Aide to JFK (uncredited)

Greg Bronson
Secret Service Agent (uncredited)

Walter Cronkite
Self (archive footage) (uncredited)

Ryder Davis
Boy Scout (uncredited)

Roger Ferreira
Army Lieutenant General (uncredited)

Armen Garo
Crewman on Freighter (uncredited)

Gilley Grey
Air Force Pilot (uncredited)

Phil Hawn
UN Administrator (uncredited)

Rick Kain
Carpenter (uncredited)

John F. Kennedy
Self (voice) (archive footage) (uncredited)

Steven Koller
White House Staff (uncredited)

Pramod Kumar
U Thant (uncredited)

Richard Rossi
Reporter (uncredited)

Larry Strauss
Treasury Secretary Douglas Dillon (uncredited)

Brad Yoder
Sorensen's Assistant (uncredited)