Control Voice (voice) (uncredited)

Sgt. James Conover

Emmett Balfour

Trent

Adam Ballard

First Reporter

Bill Turner

Dean Radcliffe

Detective Lt. Runyan

Elder of Luminos

Bert Hamil

Randolph E. Branch

Lt. Rupert Lawrence Howard (uncredited)

Ben Fields

Harvey Kry Jr.

General Juan Mercurio

Dr. Block

Navigator Dexter

Thetan (uncredited)

Ann Barton

Andro

Prof. Stephanie Linden

Dr. Sui-Lin

Luis B. Spain

Galaxy Being (as Wm. O. Douglas)

Tone Hobart

Judith Bellero

Arndis Pollard

André

Richard Bellero, Sr.

FBI Agent Marshall

Ethel Latimer

Recruiter

Prof. Ian Fraser

Maj. Jong

Dr. Alicia Hendrix

George Wilkerson (as Sammy Reese)

Wilt Morgan

Larry K. Hillerman

Dr. Soldini

Carter - Watchman

Paul Tanner / Voice in The Enemy's war helmet (voice)

The Gardener

The Nurse

Dean Flint

E. F. Larkin

Captain Buckley

Janet

Sheriff Simon Stakefield

Judson Ellis

Dr. Philip Mendl

The Senator (voice)

Nichols

Orderly

Art Harris

Lt. Minns

Francis Hadley, P.F.C.

Robert Renaldo

Johnny Subiron

Minerva

Radio DJ Gene 'Buddy' Maxwell

Cathy Evans

Col. Grover

Policeman

Mary Kry

Lisa Lawrence

Deimos

Gaby Christian

Dr. Julia Harrison

Mike Benson

Laurie Cameron

Jonathan Meridith

Andy Thorne

Jim Darcy

Eddie Phillips

Frank Summers

Tom - Duckhunter #3 (as William Bush)

Harold J. Finley

Professor Mathers

Byron Lomax

Henderson James

Noelle Anderson

Edgar Price

Pilot Coberly

Detective Sgt. Thomas Siroleo

Prof. Stephen Grave

Carla Duveen

Dr. Evan Marshall

Wade Norton

Laura Hanley

Ebonite Interrogator

Thurman Cutler (as Howard da Silva)

Gen. Jeff Barton

Karen Thorne

Linda Darcy

Election Returns Commentator (voice) (uncredited)

Dr. Phillip Gainer

Dr. Sigmund Hindeman

Dr. James Hamilton / Major Roger Brothers

Prison Warden (as Francis de Sales)

John Dexter

Justice of the Peace

Prof. Diana Brice

Tom Kagan

Dr. Simon Holm

Prof. Stuart Peters

Ben Garth

Phobos One

Kassia Paine

Pvt. Arthur Dix

Dr. James Stone

Joe Dix

Limbo Being

Amanda Frank

Bob Conner

Dr. Henschell

Mrs. Ives

Sen. Orville

Major Roger Brothers / Dr. James Hamilton

Tom Evans

Vivia Balfour Hayden

Ikar

Andrea Holm

Mrs. Palmer

Dr. Thomas Kellander

Col. Luke Stone

Co-Pilot Beeman

Alan Maxwell

Ted Pearson

Dr. Keenan

Dr. Clifford Scott

Paco

Gard Hayden

Eva Fraser

Colas (as Sir Cedric Hardwicke)

Major Merritt

D.A. Thomas Coyle

Lamont

William Lyons Selby

Vera Finley

Colonel William Campbell

Lynn Arthur

Dwight Hartley

Dr. Whorf

Dr. Roy Clinton

Major Douglas McKinnon

Li-Chin Sung

Dr. Tremaine

Prof. Arivello

Sawyer

Commanding General

Wen Li

Radio Engineer

Li Kwan

Police Chief (as Joseph Perry)

Military Commander (as Don Harvey)

Woman (as Mavis Neal)

Maj. Ho Chi-Wong

Carol Selby Conner

Jane Darcy

"Baldy" Baldwin

Matron

Sentry

Detective

Emily Radcliffe

Finley's Doctor

Steve Crandon

Gert 'the Bread' Evans

Policeman

Dr. Herschel

Fred - Duckhunter #1

Bert - Duckhunter #2

Carl Ford - TV Announcer

Lt, Bertram Cabot

Mrs. McCluskey

Capt. Joseph Reardon

Old Man (scenes deleted)

Barbara Scott

Dr. Anderson (as Lindsay Workman)

Capt. James Harrison (as Robert Beneveds)

Peterson

Nurse

Sentry

Sergeant

Dr. Jonas Temple

Caretaker

Ralph

Lt. James P. Willowmore

Lt. Esra Krug

Dix's Mother

Krug's Governess

Warren Edgar Morley

Coroner

Capt. Fortunado

Servant

Oswaldo

Skipper

Gen. Maximillian R. Hart

Maj. Roger Hill

Dr. Robert Richardson (as Ronald Foster)

Chromoite

Goldsmith

Haddon

Frank Brant

Dr. Mordecai Spazman

Mrs. Clarke

Francesca Fields

Regina

Doctor Howard Warren

Genero Planetta

Johnny

Oliver Fair

Sforza Water/Power worker

Supervisor

Mrs. Dame

Ethan Wechsler

John Bartlett

Anna Bishop

Col. MacWilliams

Capt. Mike Doweling

Man

Empyrian

General

Major Nathan Jennings

Mara Matthews

Deputy (as Joey Tata)

Lt. Gordon Halper

Major Benedict

Buddy Lyman

Lt. Ken Galvin

Tommy Shadbury

Denise Ward

Arjay Beasley

Gen. Lee Stocker

Reese Fowler

Sueann Beasley

Lt. Peter Chandler

Lt. Ernie Travers

Prof. Henry Lacosta

Phillip Griffith

Theresa Ames

Roy Benjamin

Julie Griffith

Florida Patton

Mr. Zeno

Calco Galaxy Alien

Kenny Benjamin

Detective

Agnes Benjamin

Rhea Cashman

Ralph Cashman

Father Fontana

Joe Hayden

Teenage Luminos

Collins

Laural Marshall

Dr. Terrell

Leon Chambers

The Creature

Qarlo Clobregnny

General Crawford

Loren Kagan

Leonora Edmond

Toni Kagan

The Enemy

Gen. Claiborne

Sgt. Berry

Dr. Mike

Abby Kagan

Medical Technician

Construction

Reporter #1

Elizabeth Dunn

Dr. Bernard Stone

Miss Willett (as Marcel Hebert)

Dr. Peter Wayne

Grayson

Police Lt. Branch

TV Newscaster

Sergeant Jackson

Apartment Manager

Susan Wayne

Morrow

Elevator Operator

Consuelo Biros

Night Watchman (as Owen McGivney)

Arch

Det. Sgt. Alger

Battle

General Winston

Breech

Mr. Jerome

Colonel Danvers

Lieutenant Bowman

Lieutenant Johnson

Captain Lazzari

Captain Thomas

Ethel Meridith

Nina

Peter Jellicoe

Fred

Sheriff Barclay

Mrs. McCrae

Professor 'Doc' Link

The Judge

Evie

The Surgeon

Jessup

Prof. Andrew Whitsett

The Guard

Mrs. Subiron

Miss Steen

Shop Superintendent

Second Nurse

Danny Masters

Eric Plummer

Laura James

The Megasoid

Jerichau

The Guide

The Cop

The Pedestrian

Miss Thorsen

Michael Lint

Karl Emmet

Keith Ellis

Jennifer Barham

Captain Branson

Col. Alex Barham

Gen. Daniel Pettit

Maggie O'Hara

Henry Craif

Dr. Leo Hausner

Dr. Rahm

Major Locke

Guard

Adam Lunk

Adam Link (voice)