- Vitina Marcus - Zee
- Carroll O'Connor - Gen. Southall / Col. Phil Southall
- Lyle Bettger - Maj. Hoffman
- Robert Walker Jr. - Billy the Kid
- David Opatoshu - Shopkeeper
- Gary Merrill - Senator Leroy Clark
- George Mitchell - Sitting Bull
- Regis Toomey - Dr. Ben Berkhart
- Donald Harron - Robin Hood / Earl of Huntington
- Jim McMullan - King Arthur Pendragon
- Steven Geray - Perrault
- Tom Skerritt - Matthew Gebhardt
- Torin Thatcher - Dr. Everett Holland
- James Westerfield - Sheriff
- Elizabeth Rogers - Mrs. Reynerson
- Philip Ahn - Dr. Nakamura
- Richard Jaeckel - Sgt. Mueller
- Warren Stevens - Maj. 'Doc' Harlow, M.D.
- Louis Mercier - Antoine Simon
- Victor Jory - Capt. Beal
- Anthony Caruso - Hernando Cortez
- Ellen Burstyn - Eve Holland
- Kam Tong - Sgt. Itsugi
- Larry Ward - Col. Kane
- Tris Coffin - Jess Crawford
- Robert Duvall - Raul Nimon
- Paul Fix - Henderson
- Eduardo Ciannelli - Count Enrico Galba
- Ronald Long - Friar Tuck
- Allen Case - Pat Garrett
- Michael Rennie - Capt. Malcolm Smith
- Scott Marlowe - Jeremiah Gebhardt
- Oscar Beregi Jr. - Commandant Rubidoux
- Paul Comi - Capt. Frederick Benteen
- Susan Hampshire - Althea Hall
- Lisa Gaye - Ahza
- Abraham Sofaer - Epeios
- Abraham Sofaer - Father
- Ben Wright - Cabinet Minister
- Mako - Lt. Nakamura
- James T. Callahan - Ensign Beard
- R. G. Armstrong - Allan Pinkerton
- John Doucette - Ulysses
- John Wengraf - Dr. Hans Kleinemann
- John Lupton - Capt. Reynerson
- Paul Carr - Blaine
- Paul Carr - Paris
- John Pickard - Maj. Marcus Reno
- Byron Foulger - Saloon Proprietor Williams
- Ben Cooper - Nazarro
- Ross Elliott - Dr. Brandon
- Ross Elliott - Sheriff
- Joseph Ruskin - Sardis
- Ford Rainey - President Abraham Lincoln
- Jim Davis - Col. Jim Bowie
- Myrna Fahey - Rahab
- Joe E. Tata - Napoleon Bonaparte
- Joe E. Tata - Verlaine
- John Hoyt - The Alien Leader
- John Hoyt - Dr. Steinholtz
- Dayton Lummis - William Gladstone
- Christopher Dark - Crazy Horse
- Lew Gallo - Vokar
- Lew Gallo - Lt. Anderson
- Joe Maross - Gen. George Armstrong Custer
- Perry Lopez - Dr. Charles Whitebird
- Perry Lopez - Maj. Kabir
- Christopher Cary - Merlin
- Peter Brocco - Kashi - Blind Man
- Peter Brocco - Retainer
- Sheldon Collins - Little Tony Newman Jr.
- Michael Pate - Captain
- Michael Pate - Capt. Hotchkiss
- Don Knight - First Mate Grainger
- Jean-Michel Michenaud - Marcel Corbeau
- Michael Haynes - Soldier
- John Winston - The Guard
- Frank Parker - Countdown Technician
- Rhodes Reason - Col. William Barrett Travis
- Rhodes Reason - Joshua
- Michael Ansara - Col. Hruda
- Michael Ansara - Curator
- Barry Kelley - Vice-Adm. Killian
- David Watson - Lt. Rynerson
- David Watson - Rudyard Kipling
- Gregory Morton - Prof. Ainsley
- Linden Chiles - Commander Newman Sr.
- Robert Riordan - Admiral Brandt
- Susan Flannery - Louise Neal
- John Napier - Capt. Jenkins
- Victor Lundin - Karnosu
- Kevin Hagen - Alien Planet Leader
- Kevin Hagen - Sgt. Maddox
- Kevin Hagen - McDonnell
- Kevin Hagen - Greek Sword Leader
- Dee Hartford - Helen of Troy
- John Orchard - Engelard de Cigogne
- John Orchard - King John
- Bruce Mars - Tom Custer
- Jim Halferty - Trooper Tim McGinnis
- Marcel Hillaire - Boudaire
- Theo Marcuse - Lescaux
- Harry Lauter - Wilson
- Harry Lauter - Mr. Johnson
- Peter Balakoff - Capt. Alfred Dreyfus
- Alain Patrick - Claude
- Robert Adler - Gaunt Man
- George Sawaya - French Sailor
- Pat Michenaud - Louis Joseph Xavier Francois / Dauphin
- Lawrence Montaigne - Yellow Elk
- Lawrence Montaigne - Capt. Alvarado
- Malachi Throne - Hara Singh
- Malachi Throne - Michaels / Niccolo Machiavelli
- Nehemiah Persoff - Prof. Anton Biraki
- Russ Conway - Gen. Parker
- Gregory Gaye - Alexis
- Edward Colmans - Dr. Armandez
- Alberto Monte - Sgt. Garcia
- Fred Stromsoe - Sentry
- Sam Groom - Jerry
- George Keymas - Ali
- Brendan Dillon - Col. Fettretch
- Robert Carricart - Mirabeau
- Francis De Sales - Dr. Shumate
- Michael St. Clair - Duchamps
- Tiger Joe Marsh - Torturer
- Tiger Joe Marsh - Executioner
- Erin O'Brien-Moore - Baroness Elmont
- James Lanphier - Dubois
- Brent Davis - Marine Sergeant
- Vince Howard - Medic
- John Crawford - Henderson
- John Crawford - John Poe
- John Crawford - Little John
- John Crawford - Major
- John Drake - Marine
- Rodolfo Hoyos Jr. - Capt. Rodriguez
- Rodolfo Hoyos Jr. - Castillano
- Fred Beir - Taureg
- Jan Merlin - Centauri
- Gunnar Hellström - Maj. Neistadt
- Nino Candido - Cpl. Benito Mussolini
- Arnold Moss - Malek
- Cynthia Lane - Shala
- Teno Pollick - Young Chief
- Abel Fernandez - Bowman
- Pitt Herbert - Tom McKinney
- Phil Chambers - Marshall
- Charles Bateman - Capt. Stephan Decatur
- James Anderson - Mr. Hampton
- Wesley Lau - Master Sgt. Jiggs
- Alex Montoya - Spanish Captain
- Joe Ryan - Magister
- Kevin O'Neal - Corporal Perkins
- Lisa Jak - Guinevere
- Vincent Beck - Wogan
- Del Monroe - Ott, Official Time Traveler
- Irwin Allen
- Lionel Newman
Robert Duvall interpreta a Raul Nimon en la serie.
Tom Skerritt interpreta a Matthew Gebhardt en la serie.
R. G. Armstrong interpreta a Allan Pinkerton en la serie.
Nehemiah Persoff interpreta a Prof. Anton Biraki en la serie.
James Darren hace el papel de Tony Newman.
Robert Colbert hace el papel de Doug Phillipps.
Whit Bissell interpreta a General Heywood Kirk en la serie.
Lee Meriwether hace el papel de Dr. Ann McGregor.
John Zaremba interpreta a Dr. Raymond Swain en la serie.
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