Vic Perrin

Control Voice (voice) (uncredited)

Aki Aleong

Dr. Sui-Lin

Ivan Dixon

Major Harold Giles

Geraldine Brooks

Yvette Leighton

Lee Philips

Radio DJ Gene 'Buddy' Maxwell

Jill Haworth

Cathy Evans

Alan Baxter

Col. Grover

Henry Darrow

Policeman

Miriam Hopkins

Mary Kry

Olive Deering

Lisa Lawrence

Carroll O'Connor

Deimos

BarBara Luna

Gaby Christian

Diana Sands

Dr. Julia Harrison

Nick Adams

Mike Benson

Salome Jens

Laurie Cameron

Henry Silva

Chino Rivera

Burt Metcalfe

Eddie Phillips

Bert Remsen

Frank Summers

Billy Green Bush

Tom - Duckhunter #3 (as William Bush)

Donald Pleasence

Harold J. Finley

Edward Mulhare

Professor Mathers

Jeff Corey

Byron Lomax

Shirley Knight

Noelle Anderson

Alfred Ryder

Edgar Price

Ed Asner

Detective Sgt. Thomas Siroleo

Michael Tolan

Prof. Stephen Grave

Grace Lee Whitney

Carla Duveen

Larry Pennell

Dr. Evan Marshall

Geoffrey Horne

Wade Norton

Nancy Malone

Laura Hanley

John Anderson

Ebonite Interrogator

Robert Duvall

Louis Mace

Jacqueline Scott

Carol Maxwell

Peter Mark Richman

Prof. Ian Fraser

Leslie Stevens

Election Returns Commentator (voice) (uncredited)

Leonard Stone

Dr. Phillip Gainer

John Marley

Dr. Sigmund Hindeman

Gary Merrill

Dr. James Hamilton / Major Roger Brothers

Francis De Sales

Prison Warden (as Francis de Sales)

Ralph Meeker

John Dexter

Russell Collins

Justice of the Peace

Ruth Roman

Prof. Diana Brice

Sam Wanamaker

Dr. Simon Holm

Michael Forest

Prof. Stuart Peters

Bruce Dern

Ben Garth

Barry Morse

Phobos One

Vera Miles

Kassia Paine

Martin Sheen

Pvt. Arthur Dix

Mark Roberts

Bob Conner

Paul Lambert

Dr. Henschell

Nora Marlowe

Mrs. Ives

Peter Breck

Sen. Orville

Harry Guardino

Major Roger Brothers / Dr. James Hamilton

Jerry Douglas

Tom Evans

Melinda Casey

Vivia Balfour Hayden

Phyllis Love

Andrea Holm

Gladys Cooper

Mrs. Palmer

Michael Higgins

Dr. Thomas Kellander

Robert Culp

Paul Cameron

Ed Nelson

Col. Luke Stone

Cliff Robertson

Alan Maxwell

Phillip Pine

Ted Pearson

Janos Prohaska

Thetan (uncredited)

Frank Maxwell

Dr. Keenan

Harry Townes

Dr. Clifford Scott

Martín Garralaga

Paco

Buck Taylor

Gard Hayden

Nina Foch

Eva Fraser

Cedric Hardwicke

Colas (as Sir Cedric Hardwicke)

James Shigeta

Maj. Jong

Sidney Blackmer

William Lyons Selby

Priscilla Morrill

Vera Finley

Joe De Santis

Colonel William Campbell

Janet Blair

Lynn Arthur

Barry Jones

Dwight Hartley

Bernard Kates

Dr. Whorf

Richard Loo

Li-Chin Sung

James McCallion

Dr. Tremaine

Jay Novello

Prof. Arivello

Gene Raymond

Sawyer

Whit Bissell

Commanding General

James Hong

Wen Li

James Yagi

Li Kwan

Joseph V. Perry

Police Chief (as Joseph Perry)

Don C. Harvey

Military Commander (as Don Harvey)

William Stevens

Policeman

Mavis Neal Palmer

Woman (as Mavis Neal)

Clarence Lung

Maj. Ho Chi-Wong

Henry Scott

FBI Agent Marshall

Nancy Rennick

Carol Selby Conner

Paul Kent

Detective

Anne Loos

Emily Radcliffe

Harry Ellerbe

Finley's Doctor

Fred Beir

Steve Crandon

Robert Doyle

Wilt Morgan

Constance Cavendish

Gert 'the Bread' Evans

George Pelling

Policeman

Martin Wolfson

Dr. Herschel

Clay Tanner

Fred - Duckhunter #1

Hal Bokar

Bert - Duckhunter #2

Lee Zimmer

Carl Ford - TV Announcer

John Considine

Lt, Bertram Cabot

Maxine Stuart

Mrs. McCluskey

Karl Held

Capt. Joseph Reardon

Jack Raine

Old Man (scenes deleted)

Joanne Gilbert

Barbara Scott

Sam Reese

Clyde Wyatt

Konstantin Shayne

Dr. Philip Fletcher

C. Lindsay Workman

Dr. Anderson (as Lindsay Workman)

Robert Benevides

Capt. James Harrison (as Robert Beneveds)

Shirley O'Hara

Dr. Soldini

John Newton

Peterson

Jane Langley

Nurse

Matty Jordan

Sentry

Art Alisi

Sergeant

Barry Atwater

Dr. Jonas Temple

Ken Renard

Caretaker

David Garner

Ralph

Bill Gunn

Lt. James P. Willowmore

Sasha Harden

Lt. Esra Krug

Lillian Adams

Dix's Mother

Lisa Mann

Krug's Governess

Joan Camden

Prof. Stephanie Linden

Ted de Corsia

New Sentry

Gene Darfler

Warren Edgar Morley

Tom Palmer

Coroner

Noel De Souza

Capt. Fortunado

Edward Colmans

Servant

Jon Silo

Oswaldo

Stuart Lancaster

Skipper

Robert F. Simon

Gen. Maximillian R. Hart

Claude Woolman

Maj. Roger Hill

Ron Foster

Dr. Robert Richardson (as Ronald Foster)

Hugh Langtry

Chromoite

Gene Tyburn

Goldsmith

Don Ross

Haddon

Bob Kelljan

Frank Brant

Linda Hutchings

Arlene Schnabel

Peter Madsen

Carter - Watchman

David Frankham

Harvey Kry Jr.

Anthony Jochim

Dr. Mordecai Spazman

Dee Hartford

Mrs. Clarke

Philip Abbott

Ben Fields

Marsha Hunt

Francesca Fields

Joanna Frank

Regina

Booth Colman

Doctor Howard Warren

Tony Mordente

Genero Planetta

William Douglas

Henry Castle

Chris Warfield

Johnny

Richard Dawson

Oliver Fair

Len Lesser

Sforza Water/Power worker

John Graham

Supervisor

Martin Landau

Richard Bellero

Sally Kellerman

Judith Bellero

Chita Rivera

Mrs. Dame

Lee Kinsolving

Ethan Wechsler

John Hoyt

Bifrost Alien

Kent Smith

Aabel

Neil Hamilton

Richard Bellero, Sr.

John Milford

John Bartlett

Crahan Denton

Sheriff Simon Stakefield

Bennye Gatteys

Anna Bishop

Stephen McNally

Col. MacWilliams

Dabbs Greer

Mr. Bishop

Richard Jaeckel

Capt. Mike Doweling

Burt Douglas

Man

Gail Kobe

Janet Doweling

Simon Oakland

Empyrian

Robert Osterloh

General

John Kellogg

Major Nathan Jennings

Janet De Gore

Mara Matthews

Joe E. Tata

Deputy (as Joey Tata)

Peter Baldwin

Lt. Gordon Halper

Don Gordon

Dave Crowell

Russell Johnson

Major Benedict

Yale Summers

Buddy Lyman

Arthur Batanides

Lt. Ken Galvin

Arnold Merritt

Tommy Shadbury

Mimsy Farmer

Denise Ward

John McLiam

Arjay Beasley

Alex Nicol

Gen. Lee Stocker

Warren Oates

Reese Fowler

Angela Clarke

Sueann Beasley

Tim O'Connor

Major Clint Anderson

Walter Burke

Dr. Frederick Riner

Curt Conway

Dr. Philip Mendl

Robert Sampson

Lt. Peter Chandler

Nellie Burt

Ethel Latimer

Hari Rhodes

Lt. Ernie Travers

Herman Rudin

Prof. Henry Lacosta

Vaughn Taylor

Randall Latimer

Richard Derr

Phillip Griffith

Luana Anders

Theresa Ames

Macdonald Carey

Roy Benjamin

Betsy Jones-Moreland

Julie Griffith

Gloria Grahame

Florida Patton

Richard Ney

Mr. Zeno

Bill Hart

Calco Galaxy Alien

Flip Mark

Kenny Benjamin

Ray Kellogg

Detective

Marion Ross

Agnes Benjamin

Joyce Van Patten

Rhea Cashman

Bob Johnson

The Senator (voice)

Edward Platt

Mr. Terrence

David Opatoshu

Ralph Cashman

Jason Wingreen

Bill Turner

Frank Puglia

Father Fontana

Bert Freed

Joe Hayden

Ben Wright

Elder of Luminos

George Macready

Dr. Marshall

Glenn Cannon

Teenage Luminos

Rudy Solari

Griffin

Joseph Ruskin

Collins

Leonard Nimoy

Konig

Signe Hasso

Laural Marshall

Allyson Ames

Arndis Pollard

Barry Russo

Dr. Terrell

Willard Sage

Coulter

Paul Lukather

Official

Howard Caine

Leon Chambers

Robert Fortier

Dr. Paul Pollard

Douglas Henderson

Dr. Tillyard

William O'Connell

The Creature

Henry Brandon

General Crawford

Scott Marlowe

André

David McCallum

Tone Hobart

Barbara Rush

Leonora Edmond

James B. Sikking

Orderly

Dabney Coleman

Lt. Rupert Lawrence Howard (uncredited)