Hal Bokar

Mr. Xeno

Richard Ney

Mrs. Dame

Chita Rivera

Deimos

Carroll O'Connor

Nick Adams

Harold J. Finley

Donald Pleasence

Dr. Evan Marshall

Larry Pennell

Narrator

Vic Perrin

Mary Kry

Miriam Hopkins

Jory Peters

Scott Marlowe

Leon Chambers

Howard Caine

Dr. James Hamilton / Major Roger Brothers

Gary Merrill

Lee Kinsolving

Prof. Stephen Grave

Michael Tolan

Allen Leighton / Paul Cameron / Trent

Robert Culp

Prof. Diana Brice

Ruth Roman

Sam Wanamaker

Sen. Orville

Peter Breck

Andro

Martin Landau

Simon Oakland

Stephen McNally

Ralph Meeker

William Lyons Selby

Sidney Blackmer

Col. Luke Stone

Ed Nelson

Lincoln Russell / Ben Fields

Philip Abbott

Radio DJ Gene 'Buddy' Maxwell

Lee Philips

GIA Agent Luis D. Spain

Don Gordon

David McCallum

Florinda Patten

Gloria Grahame

Joanna Frank

Lisa Lawrence

Olive Deering

Konig

Leonard Nimoy

Major Clint Anderson

Tim O'Connor

Nancy Malone

Vera Finley

Priscilla Morrill

General Crawford

Henry Brandon

Laurie Cameron

Salome Jens

Diana Sands

Dr. Phillip Gainer

Leonard Stone

Sgt. James Conover / Major Harold Giles

Ivan Dixon

Prof. Stuart Peters

Michael Forest

Ted Pearson

Phillip Pine

Major Roger Brothers / Dr. James Hamilton

Harry Guardino

General Juan Mercurio / Chino Rivera

Henry Silva

Maj. Jong

James Shigeta

Kenny Benjamin

Flip Mark

Carl Ford - TV Announcer

Lee Zimmer

Galaxy Being

Wm. O. Douglas

Richard Jaeckel

Lt. Bertram Cabot

John Considine

Prof. Ian Fraser

Peter Mark Richman

Edward Mulhare

Theresa 'Tess' Ames

Luana Anders

Gov. Lawrence K. Hillerman

George Macready

Phobos

Barry Morse

David Opatoshu

Mr. Byron Lomax

Jeff Corey

Gard Hayden

Buck Taylor

Mrs. Clarke

Dee Hartford

Alan Maxwell

Cliff Robertson

Eva Fraser

Nina Foch

Gen. Lee Stocker

Alex Nicol

Gaby Christian

BarBara Luna

Janet Blair

Pvt. Arthur Dix

Martin Sheen

Michael Higgins

Ray Kellogg

Phyllis Love

Crahan Denton

Wade Norton

Geoffrey Horne

Ann Barton / Yvette Leighton

Geraldine Brooks

Russell Johnson

Steve Crandon

Fred Beir

Jill Haworth

Janet De Gore

Roy Benjamin

Macdonald Carey

Carol Selby Conner

Nancy Rennick

Gen. Maximillian R. Hart

Robert F. Simon

Noelle Anderson

Shirley Knight

Carla Duveen

Grace Lee Whitney

Marsha Hunt

Reese Fowler

Warren Oates

Dr. Jonas Temple

Barry Atwater

Dr. Tillyard

Douglas Henderson

Laural Marshall

Signe Hasso

Kasha Paine

Vera Miles

Professor Hebbel / Bifrost Alien / Emmett Balfour

John Hoyt

Ingrid Larkin

Sally Kellerman

Barbara Scott

Joanne Gilbert

Li-Chin Sung

Richard Loo

Invisibles Recruiter

Walter Burke

Ralph

David Garner

Harvey Kry Jr. / Capt. Terrence Ralph Brookman

David Frankham

Frank Brant

Robert Kelljan

Agnes Benjamin

Marion Ross

John McLiam

Keenan

Frank Maxwell

Justice of the Peace

Russell Collins

Ron Foster

Dr. Philip Mendl

Curt Conway