Guy Williams

Dr. John Robinson

June Lockhart

Dr. Maureen Robinson

Mark Goddard

Major Don West

Marta Kristen

Judy Robinson

Angela Cartwright

Penny Robinson

Bill Mumy

Will Robinson

Jonathan Harris

Dr. Zachary Smith

Dick Tufeld

Robot B-9

Bob May

Robot B-9

Ted Cassidy

Slave

Melinda O. Fee

Fenestra

Leonard Stone

Farnum

Wally Cox

Tiabo

Dennis Patrick

Keema

Strother Martin

Nerim

Mike Kellin

Myko

Henry Jones

Jeremiah Smith

Albert Salmi

Captain Alonzo P. Tucker

Gerald Mohr

Morbus

Mickey Manners

Dee

Torin Thatcher

The Space Trader

Michael J. Pollard

The Boy

Michael Ansara

The Ruler

Hans Conried

Sagramonte

Wilbur Evans

Lighted Head Leader

Lamar Lundy

The Giant Cyclops

John Carradine

Arcon

Sean McClory

Hamish

Al Lewis

Zalto

Francine York

Niolani

Werner Klemperer

Bolix

Fritz Feld

Mr. Zumdish

Warren Oates

Jimmy Hapgood

Robert Easton

Newsman Lacy

Frank Delfino

Acteur

Ronald Long

Admiral Zahrk

Kevin Hagen

Alien

Lew Gallo

Cmdr. Fletcher

Arthur Batanides

Rongah

Kym Karath

Princess

Lyle Waggoner

Mechanical Man

Daniel J. Travanti

Space Hippie

Stanley Adams

Tybo

Vincent Beck

Megazor

Abraham Sofaer

Sobram

Mercedes McCambridge

Sybilla

Michael Conrad

Creech

Lou Wagner

J-5

John Crawford

Dr. Chronos

Eddie Quillan

Bartender

Malachi Throne

Thief

Walter Burke

O. M.

Peter Brocco

Alien Leader

Janos Prohaska

Bird Monster

James Westerfield

Dr. Marvello

Michael Rennie

The Keeper

Vitina Marcus

Lorelei

Kurt Russell

Quano

Larry Ward

Ohan

Michael Fox

Alien on Computer Screen (voice)

Reta Shaw

Aunt Clara Simms

John Abbott

Sesmar

Sherry Jackson

Effra

Arte Johnson

Fedor

Don Matheson

Rethso

Tol Avery

Warden

Liam Sullivan

Nexus

Joe E. Tata

Purple Robot (voice)

Royal Dano

Major Domo

Woodrow Parfrey

Col. Silas Fogey

Edy Williams

Non

Chuck Roberson

Alien Fighter

Lane Bradford

Barfly

Helen Kleeb

Phone Operator Rachel

Brett Parker

Security Guard

Ford Rainey

The President

Don Forbes

TV Commentator

Hal Torey

General

Fred Crane

Alpha Control Technician

Robert 'Big Buck' Maffei

The Giant Cyclops

Alan Hewitt

Lemnoc

Allan Melvin

Little Joe / Gambling Machine (voice)

Bern Hoffman

Thor

Charles Dierkop

Horned Mutant

Don Eitner

Sgt. Smith

Duke Fishman

Convict

Françoise Ruggieri

Moela

Fred Krone

Monster

Harry Harvey

Grover

Harry Monty

Geoo

Hoke Howell

Security Guard

Jim Boles

Smeek

Jim Gosa

Gilt Proto

June Foray

Gundemar (voice)

Ken Mayer

Pleiades Pete

Lars Hensen

Convict

Linda Gaye Scott

Aien Girl

Marcel Hillaire

Junkman

Robert Foulk

Cragmire

Ron Gans

Frog Alien (voice)

Sheila Allen

Ruth Templeton

Theodore Lehmann

Alien

Tommy Farrell

Cyborg

Walter Sande

Sheriff George Baxendale