- James Darren
- Â Dr. Tony Newman 30 episodes, 1966-1967
- Robert Colbert
- Â Dr. Doug Phillips 30 episodes, 1966-1967
- Whit Bissell
- Â Lt. Gen. Heywood Kirk / ... 30 episodes, 1966-1967
- John Zaremba
- Â Dr. Raymond Swain 30 episodes, 1966-1967
- Lee Meriwether
- Â Dr. Ann MacGregor 30 episodes, 1966-1967
- Sam Groom
- Â Jerry - Technician 5 episodes, 1966
- Wesley Lau
- Â Sgt. Jiggs 4 episodes, 1966-1967
- John Crawford
- Â Henderson / ... 4 episodes, 1966-1967
- Kevin Hagen
- Â Alien Planet Leader / ... 4 episodes, 1966-1967
- Tiger Joe Marsh
- Â Executioner / ... 1 episode, 1966-1967
- John Drake
- Â First Marine / ... 1 episode, 1967
- Malachi Throne
- Â Hara Singh / ... 2 episodes, 1966-1967
- Michael Ansara
- Â Col. Hruda / ... 2 episodes, 1966-1967
- Vitina Marcus
- Â Sarit / ... 2 episodes, 1967
- Gary Haynes
- Â Deputy Sam Colt / ... 2 episodes, 1967
- Michael Pate
- Â Capt. Hotchkiss / ... 2 episodes, 1966-1967
- Lawrence Montaigne
- Â Capt. Alvarado / ... 2 episodes, 1966-1967
- Lew Gallo
- Â Lt. Anderson / ... 2 episodes, 1966-1967
- David Watson
- Â Lt. Rynerson / ... 2 episodes, 1966
- Paul Carr
- Â Blaine / ... 2 episodes, 1966
- Rhodes Reason
- Â Col. William Barrett Travis / ... 2 episodes, 1966-1967
- Harry Lauter
- Â Mr. Johnson / ... 2 episodes, 1967
- Ross Elliott
- Â Dr. Brandon / ... 2 episodes, 1966-1967
- Perry Lopez
- Â Dr. Charles Whitebird / ... 2 episodes, 1966
- Joe E. Tata
- Â Napoleon Bonaparte / ... 2 episodes, 1966
- Abraham Sofaer
- Â Epeios / ... 2 episodes, 1966-1967
- Peter Brocco
- Â Kashi - Blind Man / ... 2 episodes, 1966-1967
- John Hoyt
- Â Dr. Steinholtz / ... 2 episodes, 1967
- Rodolfo Hoyos Jr.
- Â Capt. Rodriguez / ... 2 episodes, 1966-1967
- Michael Rennie
- Â Capt. Malcolm Smith 1 episode, 1966-1967
- Robert Duvall
- Â Raul Nimon 2 episodes, 1967
- Vincent Beck
- Â Alien Leader / ... 1 episode, 1967
- John Winston
- Â British Sentry / ... 1 episode, 1966
- Robert Adler
- Â Gaunt Man / ... 1 episode, 1966
- Virginia Semon
- Â Female in Alamo / ... 1 episode, 1966-1967
- Pat Murphy
- Â Conspirator #3 / ... 1 episode, 1966
- John Saxon
- Â Marco Polo 1 episode, 1967
- Carroll O'Connor
- Â Col. Phil Southall / ... 1 episode, 1966
- Paul Fix
- Â Henderson - Mining Supervisor 1 episode, 1966
- Nehemiah Persoff
- Â Prof. Anton Biraki 1 episode, 1966
- John Doucette
- Â Ulysses 1 episode, 1966
- James T. Callahan
- Â Navy Ensign Beard 1 episode, 1966
- Joe Maross
- Â Gen. George Armstrong Custer 1 episode, 1966
- Torin Thatcher
- Â Dr. Everett Holland 1 episode, 1966
- David Opatoshu
- Â Shopkeeper 1 episode, 1966
- Linden Chiles
- Â Commander Newman Sr. 1 episode, 1966
- Lyle Bettger
- Â Maj. Hoffman 1 episode, 1966
- Scott Marlowe
- Â Jeremiah Gebhardt 1 episode, 1966
- Marcel Hillaire
- Â Boudaire 1 episode, 1966
- Donald Harron
- Â Earl of Huntington / ... 1 episode, 1966
- Robert Walker Jr.
- Â Billy the Kid (William H. Bonney) 1 episode, 1967
- Mako
- Â Lt. Nakamura 1 episode, 1967
- Victor Jory
- Â Capt. Beal 1 episode, 1967
- Myrna Fahey
- Â Rahab 1 episode, 1967
- Jan Merlin
- Â Centauri 1 episode, 1967
- Eduardo Ciannelli
- Â Count Enrico Galba 1 episode, 1967
- Christopher Cary
- Â Merlin 1 episode, 1967
- Teno Pollick
- Â Young Chief 1 episode, 1967
- Ellen Burstyn
- Â Eve Holland 1 episode, 1966
- Dee Hartford
- Â Helen of Troy 1 episode, 1966
- Susan Hampshire
- Â Althea Hall 1 episode, 1966
- James Westerfield
- Â Sheriff 1 episode, 1966
- John Lupton
- Â Capt. Reynerson 1 episode, 1966
- Ben Cooper
- Â Nazarro 1 episode, 1966
- Oscar Beregi Jr.
- Â Commandant Rubidoux 1 episode, 1966
- John Alderson
- Â Little John 1 episode, 1966
- Christopher Dark
- Â Crazy Horse 1 episode, 1966
- Robert Carricart
- Â Mirabeau 1 episode, 1966
- Monique LeMaire
- Â Marie Antoinette 1 episode, 1966
- Regis Toomey
- Â Dr. Ben Berkhart 1 episode, 1967
- Heather Young
- Â Joan 1 episode, 1967
- Allen Case
- Â Sheriff Pat Garrett 1 episode, 1967
- Fred Beir
- Â Taureg 1 episode, 1967
- Kam Tong
- Â Sgt. Itsugi 1 episode, 1967
- Del Monroe
- Â Official Time Traveler / ... 1 episode, 1967
- Gunnar Hellström
- Â Maj. Neistadt 1 episode, 1967
- Lisa Jak
- Â Guinevere 1 episode, 1967
- Tom Skerritt
- Â Matthew Gebhardt 1 episode, 1966
- Jim Davis
- Â Col. Jim Bowie 1 episode, 1966
- Warren Stevens
- Â Maj. 'Doc' Harlow, M.D. 1 episode, 1966
- Gary Merrill
- Â Sen. Leroy Clark 1 episode, 1966
- Ford Rainey
- Â President Abraham Lincoln 1 episode, 1966
- Paul Comi
- Â Capt. Frederick Benteen 1 episode, 1966
- Theodore Marcuse
- Â Lescaux 1 episode, 1966
- Victor Lundin
- Â Karnosu 1 episode, 1966
- Ronald Long
- Â Friar Tuck 1 episode, 1966
- Louis Mercier
- Â Antoine Simon 1 episode, 1966
- John Wengraf
- Â Dr. Hans Kleinemann 1 episode, 1966
- Richard Jaeckel
- Â Sgt. Mueller 1 episode, 1967
- Lisa Gaye
- Â Ahza 1 episode, 1967
- Mabel Albertson
- Â Sarah Pettinghill 1 episode, 1967
- Anthony Caruso
- Â Hernando Cortez 1 episode, 1967
- Arthur Batanides
- Â Batu 1 episode, 1967
- Philip Ahn
- Â Dr. Nakamura 1 episode, 1967
- Jim McMullan
- Â King Arthur Pendragon 1 episode, 1967
- Pepito Galindo
- Â Armando Del Giddeo 1 episode, 1967
- R.G. Armstrong
- Â Allan Pinkerton 1 episode, 1966
- Joseph Ruskin
- Â Sardis - Ulysses Aide 1 episode, 1966
- John Pickard
- Â Maj. Marcus Reno 1 episode, 1966
- Edward Colmans
- Â Dr. Armandez 1 episode, 1966
- Larry Ward
- Â Col. Kane 1 episode, 1966
- Erin O'Brien-Moore
- Â Baroness Elmont 1 episode, 1966
- Paul Mantee
- Â Ambahai 1 episode, 1967
- Arnold Moss
- Â Malek 1 episode, 1967
- Kevin O'Neal
- Â Corporal Perkins 1 episode, 1967
- Christopher Harris
- Â David Gebhardt 1 episode, 1966
- Gregory Morton
- Â Prof. Ainsley 1 episode, 1966
- James Lanphier
- Â Dubois 1 episode, 1966
- John Napier
- Â Capt. Jenkins 1 episode, 1966
- John Orchard
- Â Engelard de Cigogne 1 episode, 1966
- Russ Conway
- Â Gen. Parker 1 episode, 1966
- Steven Geray
- Â Perrault 1 episode, 1966
- Michael St. Clair
- Â Duchamps 1 episode, 1966
- Robert Riordan
- Â Admiral Brandt 1 episode, 1966
- Pat Michenaud
- Â Louis Joseph Xavier Francois AKA Dauphin 1 episode, 1966
- Alex Montoya
- Â Spanish Captain 1 episode, 1967
- Brent Davis
- Â Marine Sergeant 1 episode, 1967
- Sheldon Collins
- Â Little Tony Newman Jr. 1 episode, 1966
- Don Knight
- Â First Mate Grainger 1 episode, 1966
- George Keymas
- Â Ali 1 episode, 1966
- Gregory Gaye
- Â Alexis 1 episode, 1966
- Alain Patrick
- Â Claude 1 episode, 1966
- Alberto Monte
- Â Sgt. Garcia 1 episode, 1966
- George Matsui
- Â Young Native 1 episode, 1966
- Vince Howard
- Â Medic 1 episode, 1967
- Tristram Coffin
- Â Jess Crawford 1 episode, 1967
- Charles Bateman
- Â Capt. Stephan Decatur 1 episode, 1967
- Abel Fernandez
- Â Bowman 1 episode, 1967
- Pitt Herbert
- Â Tom McKinney 1 episode, 1967
- Nino Candido
- Â Cpl. Benito Mussolini 1 episode, 1967
- Joe Ryan
- Â Magister 1 episode, 1967
- Barry Kelley
- Â Vice-Adm. Killian 1 episode, 1966
- George Mitchell
- Â Sitting Bull 1 episode, 1966
- Jean-Michel Michenaud
- Â Marcel Corbeau 1 episode, 1966
- Francis De Sales
- Â Dr. Shumate 1 episode, 1966
- Caroline Barrett
- Â Yuko 1 episode, 1966
- Brendan Dillon
- Â Col. Fettretch 1 episode, 1966
- Ted Roter
- Â Capt. Alfred Dreyfus 1 episode, 1966
- Byron Foulger
- Â Saloon Proprietor Williams 1 episode, 1967
- Phil Chambers
- Â Marshall 1 episode, 1967
- Susan Flannery
- Â Louise Neal 1 episode, 1966
- Elizabeth Rogers
- Â Mrs. Reynerson 1 episode, 1966
- Bruce Mars
- Â Tom Custer 1 episode, 1966
- James Anderson
- Â Mr. Hampton 1 episode, 1967
- Cynthia Lane
- Â Shala 1 episode, 1967
- Ben Wright
- Â Cabinet Minister 1 episode, 1966
- Frank Parker
- Â Countdown Technician 1 episode, 1966
- Jim Halferty
- Â Trooper Tim McGinnis 1 episode, 1966
- Dayton Lummis
- Â William Gladstone 1 episode, 1966
- Fred Stromsoe
- Â Sentry 1 episode, 1966
- George Sawaya
- Â French Sailor 1 episode, 1966
- Dick Tufeld
- Â Announcer / ... (uncredited) 22 episodes, 1966-1967
- Paul Stader
- Â Cowboy #3 / ... (uncredited) 8 episodes, 1966-1967
- Anne Dore
- Â Time Tunnel Technician / ... (uncredited) 5 episodes, 1966-1967
- Bart La Rue
- Â Computer Voice / ... (uncredited) 4 episodes, 1966-1967
- Patrick Culliton
- Â Cowboy / ... (uncredited) 4 episodes, 1966-1967
- Denver Mattson
- Â German Soldier #5 / ... (uncredited) 4 episodes, 1966-1967
- Orwin C. Harvey
- Â First Soldier / ... (uncredited) 4 episodes, 1966-1967
- George Robotham
- Â German Corporal / ... (uncredited) 3 episodes, 1966-1967
- Eddie Saenz
- Â Arab / ... (uncredited) 3 episodes, 1966-1967
- William Graeff Jr.
- Â Conspirator #2 / ... (uncredited) 2 episodes, 1966-1967
- Dave Dunlap
- Â Johnson / ... (uncredited) 2 episodes, 1966-1967
- Gene Silvani
- Â Conspirator #1 / ... (uncredited) 2 episodes, 1966-1967
- Michael Haynes
- Â Soldier / ... (uncredited) 2 episodes, 1966
- Gil Perkins
- Â Mongol Warrior / ... (uncredited) 2 episodes, 1967
- Gary Epper
- Â Guard #2 / ... (uncredited) 2 episodes, 1967
- Seymour Koenig
- Â Italian Soldier #1 / ... (uncredited) 2 episodes, 1967
- Dennis Hopper
- Â Tabor - Passenger (uncredited) 1 episode, 1966
- Howard Culver
- Â Voice (uncredited) 1 episode, 1966
- Mark Russell
- Â Third Pinkerton Agent (uncredited) 1 episode, 1966
- Michael Jeffers
- Â Ship Passenger (uncredited) 1 episode, 1966
- Jerry Fujikawa
- Â Japanese Lieutenant Okuno (uncredited) 1 episode, 1966
- Nelson Leigh
- Â Preacher (uncredited) 1 episode, 1966
- James Gonzalez
- Â Technician (uncredited) 1 episode, 1966
- William Beckley
- Â Loading Crewman (uncredited) 1 episode, 1966
- Dick Geary
- Â Pinkerton Agent Carver (uncredited) 1 episode, 1966
- Colin Kenny
- Â Ship Passenger (uncredited) 1 episode, 1966
- Fuji
- Â Sumida (uncredited) 1 episode, 1966
- Joseph La Cava
- Â Ship Passenger (uncredited) 1 episode, 1966
- Hal Taggart
- Â Ship Passenger (uncredited) 1 episode, 1966
- Kim Kahana
- Â Native (uncredited) 1 episode, 1966
- Dinny Powell
- Â Boiler Room Stoker (uncredited) 1 episode, 1966
- Pat O'Hara
- Â Radio Operator (uncredited) 1 episode, 1966
- Clark Ross
- Â Ship Passenger (uncredited) 1 episode, 1966
- Donald Lawton
- Â Chief Steward (uncredited) 1 episode, 1966
- William Meader
- Â Ship Passenger (uncredited) 1 episode, 1966
- Bob Okazaki
- Â Tasaka (uncredited) 1 episode, 1966
- George Pelling
- Â Titanic Steward (uncredited) 1 episode, 1966
- Dick Dial
- Â Soldier (uncredited) 1 episode, 1966
- John Pedrini
- Â Ship Passenger (uncredited) 1 episode, 1966
- John A. Neris
- Â Robert Corbeau (uncredited) 1 episode, 1966
- Bill Scully
- Â Martin (uncredited) 1 episode, 1966
- Frankie Kabott
- Â Billy Neal (uncredited) 1 episode, 1966
- Anthony Brand
- Â Trojan Captain (uncredited) 1 episode, 1966
- Ivan Markota
- Â Range Officer (uncredited) 1 episode, 1966
- Nadine Arlyn
- Â Jeanine Corbeau (uncredited) 1 episode, 1966
- Eric Michelwood
- Â Second Loading Crewman (uncredited) 1 episode, 1966
- Christopher King
- Â U.S. Sergeant (uncredited) 1 episode, 1966
- Marshall Carter
- Â British Soldier (uncredited) 1 episode, 1966
- Buddy Gates
- Â Ship Passenger (uncredited) 1 episode, 1966
- Wayne Lundy
- Â American Soldier (uncredited) 1 episode, 1966
- Owen C. Harvey
- Â Townsman (uncredited) 1 episode, 1966
- John J. Burns
- Â American Scout (uncredited) 1 episode, 1966
- Dennis Christopher
- Â Young Merlin (uncredited) 1 episode, 1967
- Paul Picerni
- Â Mongol Warrior (uncredited) 1 episode, 1967
- Chuck Hicks
- Â Soldier #4 (uncredited) 1 episode, 1967
- Kelly Thordsen
- Â Alien Sarah (uncredited) 1 episode, 1967
- Albert Cavens
- Â Mongol Warrior (uncredited) 1 episode, 1967
- Bob May
- Â Adolf Hitler (uncredited) 1 episode, 1967
- Fred Carson
- Â Frozen Townsperson (uncredited) 1 episode, 1967
- David Sharpe
- Â Cowboy #2 (uncredited) 1 episode, 1967
- Jerry Catron
- Â Android #1 (uncredited) 1 episode, 1967
- Pedro Regas
- Â Chief's Father (uncredited) 1 episode, 1967
- Hal Torey
- Â Technician - AKA Dr. Alfred Stiles (uncredited) 1 episode, 1967
- Mike Morelli
- Â Frozen Townsperson (uncredited) 1 episode, 1967
- Betty Jeanne Glennie
- Â Time Tunnel Technician (uncredited) 1 episode, 1967
- Paul Kessler
- Â Viking #2 (uncredited) 1 episode, 1967
- George Burrafato
- Â Frozen Townsperson (uncredited) 1 episode, 1967
- Preston Petersen
- Â Soldier #3 (uncredited) 1 episode, 1967
- Dusty Cadis
- Â Cowboy #1 (uncredited) 1 episode, 1967
- Glen Colbert
- Â Guard in Interior Scientist Office (uncredited) 1 episode, 1967
- Amapola Del Vando
- Â Chief's Mother (uncredited) 1 episode, 1967
- Ray Didsbury
- Â Intercom Voice (uncredited) 1 episode, 1967
- Steve Howell
- Â Viking #3 (uncredited) 1 episode, 1967
- Mike Donovan
- Â Slave #1 (uncredited) 1 episode, 1967
- Skip Burnham
- Â Viking #4 (uncredited) 1 episode, 1967
- Stephen Smith
- Â German Soldier #2 (uncredited) 1 episode, 1967
- T. Winslow
- Â Viking #6 (uncredited) 1 episode, 1967
- Bob Todd
- Â Roman Senator (uncredited) 1 episode, 1967
- Ed Jahnke
- Â German Soldier #3 (uncredited) 1 episode, 1967
- Miriam Schelber
- Â Time Tunnel Technician (uncredited) 1 episode, 1967
- Gregg Jacobson
- Â German Soldier #1 (uncredited) 1 episode, 1967
- Louis Paul
- Â Italian Soldier #2 (uncredited) 1 episode, 1967
- George Barefoot
- Â Android #2 (uncredited) 1 episode, 1967
