Cornelius

Roddy McDowall

Acting

Dr. Zira

Kim Hunter

Acting

Dr. Lewis Dixon

Bradford Dillman

Acting

Dr. Stephanie 'Stevie' Branton

Natalie Trundy

Acting

Dr. Otto Hasslein

Eric Braeden

Acting

The President

William Windom

Acting

Dr. Milo

Sal Mineo

Acting

E-1

Albert Salmi

Acting

E-2

Jason Evers

Acting

Committee Chairman

John Randolph

Acting

General Winthrop

Harry Lauter

Acting

Aide

M. Emmet Walsh

Acting

Lawyer (as Roy E. Glenn Sr.)

Roy Glenn

Acting

Cardinal

Peter Forster

Acting

Army Officer

Norman Burton

Acting

Naval Officer

William Woodson

Acting

Orderly

Tom Lowell

Acting

Marine Captain

Gene Whittington

Acting

Curator

Donald Elson

Acting

TV Newscaster

Bill Bonds

Acting

Referee

Army Archerd

Acting

General Faulkner

James Bacon

Acting

Armando

Ricardo Montalban

Acting

Marine Corporal (uncredited)

John Alderman

Acting

General (uncredited)

Alan Baxter

Acting

Secretary of State (uncredited)

Jack Berle

Acting

Official at Briefing (uncredited)

Paul Bradley

Acting

German Newscaster (uncredited)

Karl Bruck

Acting

Undetermined (uncredited)

Sam Chew Jr.

Acting

Reporter (uncredited)

Robert Cole

Acting

Talking Baby Chimp (uncredited) (voice)

Walker Edmiston

Acting

Spectator (uncredited)

Sig Frohlich

Acting

Helicopter Pilot (uncredited)

James W. Gavin

Acting

Official at Briefing (uncredited)

George Golden

Acting

Official at Briefing (uncredited)

James Gonzalez

Acting

Bodyguard (uncredited)

Joe Gray

Acting

Aide (uncredited)

Bob Harks

Acting

Nova (archive footage) (uncredited)

Linda Harrison

Acting

Reporter at Hotel (uncredited)

Elizabeth Harrower

Acting

Bystander (uncredited)

Shep Houghton

Acting

Waiter (uncredited)

Joseph La Cava

Acting

Reporter (uncredited)

Robert Nichols

Acting

Undetermined (uncredited)

Ron Pinkard

Acting

Heloise (uncredited)

Janos Prohaska

Acting

Reporter at Hotel (uncredited)

Tony Regan

Acting

Gen. Brody (uncredited)

Stephen Roberts

Acting

Reporter (uncredited)

Hank Robinson

Acting

Control Room Officer (uncredited)

James B. Sikking

Acting

Reporter (uncredited)

Jack Slate

Acting

Official at Briefing (uncredited)

Arthur Tovey

Acting

Hotel Receptionist (uncredited)

William Tregoe

Acting

British News Anchor (uncredited)

William Beckley

Acting