Guy Williams
Dr. John Robinson (30 eps)
June Lockhart
Dr. Maureen Robinson (30 eps)
Mark Goddard
Major Don West (30 eps)
Marta Kristen
Judy Robinson (30 eps)
Angela Cartwright
Penny Robinson (30 eps)
Bill Mumy
Will Robinson (30 eps)
Jonathan Harris
Dr. Zachary Smith (30 eps)
Dick Tufeld
Robot B-9 (30 eps)
Bob May
Robot B-9 (30 eps)
Dawson Palmer
Monster (7 eps)
Fritz Feld
Mr. Zumdish (2 eps)
Vitina Marcus
Athena (2 eps)
Michael Fox
Alien on Computer Screen (voice) (2 eps)
Joe E. Tata
Zalto's Dummy (voice) (2 eps)
Allan Melvin
Little Joe / Gambling Machine (voice) (2 eps)
Tiger Joe Marsh
Elevator Operator (2 eps)
Dee Hartford
Verda (2 eps)
Ted Cassidy
Slave (1 eps)
Melinda O. Fee
Fenestra (1 eps)
Wally Cox
Tiabo (1 eps)
Dennis Patrick
Keema (1 eps)
Strother Martin
Nerim (1 eps)
Mike Kellin
Myko (1 eps)
Henry Jones
Jeremiah Smith (1 eps)
Albert Salmi
Captain Alonzo P. Tucker (1 eps)
Gerald Mohr
Morbus (1 eps)
Mickey Manners
Dee (1 eps)
Hans Conried
Sagramonte (1 eps)
John Carradine
Arcon (1 eps)
Sean McClory
Hamish (1 eps)
Al Lewis
Zalto (1 eps)
Francine York
Niolani (1 eps)
Ronald Long
Admiral Zahrk (1 eps)
Eddie Quillan
Bartender (1 eps)
Malachi Throne
Thief (1 eps)
Walter Burke
O. M. (1 eps)
Peter Brocco
Alien Leader (1 eps)
Janos Prohaska
Bird Monster (1 eps)
James Westerfield
Dr. Marvello (1 eps)
Ron Gans
Frog Alien (voice) (1 eps)
John Abbott
Sesmar (1 eps)
Chuck Roberson
Alien Fighter (1 eps)
Lane Bradford
Barfly (1 eps)
Sue England
Space Control Officer O-3 (voice) (1 eps)
Michael Greene
Nubu (1 eps)
Gregory Morton
Judge Iko (voice) (1 eps)
Harry Monty
Geoo (1 eps)
Maxine Gates
Fat Princess (1 eps)
Ken Mayer
Pleiades Pete (1 eps)
Bill Troy
Alien (1 eps)
Harry Raybould
Urso (1 eps)
June Foray
Gundemar (voice) (1 eps)
Jeff County
Gundemar (1 eps)
Larry Dean
Wooden Soldier (1 eps)
Sheila Allen
Brynhilda (1 eps)
Bern Hoffman
Thor (1 eps)
Jim Boles
Smeek (1 eps)
Craig Duncan
Deek (1 eps)
Don Matheson
IDAK Alpha 12 (1 eps)
Alan Hewitt
Lemnoc (1 eps)
Jim Mills
Saticon (1 eps)