President

Ford Rainey

Prof. John Robinson

Guy Williams

Dr. Smith

Parker Posey

General

Hal Torey

Don West

Ignacio Serricchio

Maureen Robinson

June Lockhart

TV Commentator

Don Forbes

Maureen Robinson

Molly Parker

Major Don West

Mark Goddard

John Robinson

Toby Stephens

Judy Robinson

Marta Kristen

Will Robinson

Bill Mumy

Will Robinson

Max Jenkins

Penny Robinson

Angela Cartwright

Sentry

Brett Parker

Judy Robinson

Taylor Russell

Dr. Zachary Smith

Jonathan Harris

Penny Robinson

Mina Sundwall

Damien Witecka

Robot

Dick Tufeld

Giant Cyclops

Lamar Lundy

Alien

Frank Graham

Dog-faced alien

Hal John Norman

The Boy

Michael J. Pollard

Sybilla

Mercedes McCambridge

Nexus

Liam Sullivan

Rethso

Don Matheson

Mr. Nobody

William Bramley

Alien

Ted Lehmann

Canto of Quasti

Gregory Morton

Horned Mutant

Charles Dierkop

Capt. Alonzo P. Tucker

Albert Salmi

Giant Debbie the Bloop

Janos Prohaska

The Keeper

Michael Rennie

Aunt Clara Simms

Reta Shaw

Robot B-9

Bob May

Space trader

Torin Thatcher

Bolix

Werner Klemperer

Jimmy Hapgood

Warren Oates

The Ruler

Michael Ansara

Major Domo

Royal Dano

Effra

Sherry Jackson

Quano

Kurt Russell

Alien

Kevin Hagen

Moela

Francoise Ruggieri

Robotoid voice

Ollie O'Toole

Princess

Kym Karath

Giant Cyclops

Robert Maffei

Ohan

Larry Ward

Bubble Creature

Dawson Palmer

Lighted Head Leader

Wilbur Evans

Sheriff George Baxendale

Walter Sande

Luminary

Joe Ryan

Hairy monster

Mike Donovan

Newsman Lacy

Robert Easton

Administrator

Fred Crane

Lunon

Eddie Rosson

Grover

Harry Harvey

Alpha Control Technician

Fred Craine

Countdown Voice

Bart LaRue

Phone operator Rachel

Helen Kleeb

Inspector

Tom Allen

First Selectman

Anne Dore

Bearded Foreign Correspondent

Paul Zastupnevich

Davey Simms

Donald Losby

Theodore

Keith Taylor

First boy

Johnny Tuohy