- Eric Server - Dr. Theopolis (voice)
- Jay Garner - Admiral Efram Asimov
- Felix Silla - Twiki
- Macdonald Carey - Dr. Mallory
- Sam Jaffe - The Keeper
- Michael Stroka - Rolla
- Lance LeGault - Flagg
- David S. Cass Sr. - Major Jason Samos / Pangor
- William Sylvester - Lt. General Preston Myers
- Peter Kastner - Reardon
- Denny Miller - Saurus
- Anne Jeffreys - Prime Minister
- John P. Ryan - Kurt Belzack
- Robert Quarry - Commander Corliss
- Kimberly Beck - Alison Michaels
- Tara Buckman - Majel
- Earl Boen - Selmar
- Joseph Wiseman - Carl Morphus
- Pamela Susan Shoop - Tangie
- Tamara Dobson - Dr. Delora Bayliss
- Lincoln Kilpatrick - Dr. Ecbar
- Anne Lockhart - Leila Markeson / Jennifer
- Bob Minor - Guard
- Judith Chapman - Lara Tizian
- Judy Landers - Joanna
- Keith Andes - Darius
- Allan Hunt - Wingman
- Don Marshall - Julio
- John Furlong - Cop
- David Opatoshu - Llamajuna
- Howard Culver - Mailman
- Billy Curtis - General Yoomak
- Paul Carr - Lieutenant Devlin
- Walter Brooke - U.S. President
- Stuart Nisbet - Rand
- Elizabeth Allen - Roxanne Trent
- Michael Delano - Malary Pantera
- Dorothy Stratten - Miss Cosmos
- H.B. Haggerty - Tigerman
- Jay Robinson - Cassius Thorne
- Alfred Ryder - Garedon
- Albert Popwell - Koren
- Juanin Clay - Major Marla Landers
- Gina Gallego - Woman
- Mary Woronov - Nola
- Bob Seagren - Rand Sorgon
- Jerry Orbach - Lars Mangros
- Heidi Bohay - Maya
- Frank Parker - Captain
- Jack Palance - Kaleel
- James Sloyan - Barney Smith
- Vera Miles - Tora
- Michael Fox - High Judge
- Buck Young - Brigadier General Biles
- Eldon Quick - Chronos
- Trisha Noble - Sabrina
- Bruce Wright - Rorvik
- Gino Conforti - Sylvie
- Elgin Baylor - Olympian
- Richard Moll - Yarat
- Fred Sadoff - Kelan
- Roddy McDowall - Governor Saroyan
- Frank Gorshin - Seton Kellogg
- Larry Ward - First Council Member
- John Milford - Air Force General
- K.T. Stevens - Lieutenant Harriet Twain
- Brett Halsey - Cruise Ship Captain
- Cesar Romero - Amos Armat
- Paul Mantee - Karl
- Leonard Lightfoot - Cirus
- John Quade - Jolen Quince
- Eddie Firestone - Corporal M.K. Schultz
- James Luisi - Hood
- Jessie Lawrence Ferguson - Lieutenant Rekoff
- Paul Coufos - Eric Zogan
- Victor Argo - Raphael Argus
- Julie Newmar - Zarina
- Rosemary DeCamp - Buck's Mother
- Robert Hardy - Clayton
- Ana Alicia - Felina Redding
- Peter Graves - Major Noah Cooper
- Alice Frost - Rita
- Markie Post - Joella Cameron
- Ann Dusenberry - Ariela Dyne
- Liberty Godshall - Nyree
- Henry Silva - Kane
- Duke Butler - Tigerman
- Caroline Smith - Delta Section
- John Dewey Carter - Supervisor
- David Groh - Major Duke Danton
- Brianne Leary - Ryma
- Karen Carlson - Stella Warden
- Michael Mullins - Regis Saroyan
- Buster Crabbe - Brigadier Gordon
- Robert Dowdell - Galen
- Sheila Wills - Major Fields
- Diane Markoff - Pilot
- June Whitley Taylor - Woman
- Borah Silver - Husband
- Richard Lynch - Morgan Velosi
- Ted Chapman - Man
- Cathey Paine - Argus' Ship's Computer (voice)
- James McEachin - Richard Selvan
- Robert Tessier - Marcos
- Nancy DeCarl - Sherese
- Whitney Rydbeck - Hartsteen
- Seamon Glass - Pirate
- Woody Strode - Sgt. 'Big Red' MacMurthy
- Sid Haig - Spirot
- Sid Haig - Pratt
- Dan Sturkie - Eli Twain
- Clifford Turknett - War Technician
- Jamie Lee Curtis - Jen Burton
- Bert Rosario - Sergio Sanwiler
- Robert Cornthwaite - Ted Warwick
- Daniel Ades - Gymon
- Michael Masters - Worker
- Michael Masters - Jailer
- Charles Walker - Lieutenant Zimmerman
- Jim B. Smith - Shuttle Captain
- Antoinette Stella - Jayel
- Wendy Oates - Renna
- Darrell Zwerling - Macon
- Teddi Siddall - Linea
- Wally K. Berns - Major Norris
- James Faracci - Karsh
- Ray Walston - Roderick Zale
- Melody Rogers - Lieutenant Dia Cyrton
- Lester Fletcher - M.D. Toman
- Tobar Mayo - Guard
- Tony Epper - Drunk
- Leigh McCloskey - Jalor Davin
- Patty Maloney - Tina
- Christopher Stone - Commander Royko
- Nicholas Hormann - Vorvon
- Phil Hoover - Nelson
- Phil Hoover - Mr. Napier
- Jeannie Fitzsimmons - Freighter Captain
- Dennis Haysbert - Security Guard
- Dennis Haysbert - Lieutenant Parsons
- Dennis Haysbert - Helmsman
- Don Maxwell - Guard
- Don Maxwell - Draconian Soldier
- David Moses - Technician
- Morgan Brittany - Raylyn Derren
- Peter MacLean - Col. Cornel Traeger
- Harry Gold - Alien Squadron Leader
- Abraham Alvarez - Security Agent
- Victoria Woodbeck - Technician
- Gary Coleman - Hieronymous Fox
- Betty A. Bridges - Technician
- Anne-Marie Martin - Stella Breed
- David Darlow - Pinchas
- Bebe Louie - Clare
- Eugenia Wright - Dawn
- Ken Letner - Oto Anad
- Nicolas Coster - Alaric
- Anthony James - Varek
- Anthony James - Mr. Graf
- Barney McFadden - Jorex Leet
- Thomas Henderson - Olympian
- Carlos Palomino - Olympian
- Jerry Quarry - Quarod
- John A. Zee - Satrap
- Paul Koslo - Commander Reeve
- Shawn Michaels - Supervisor
- Nancy Frangione - Karana
- Jesse D. Goins - Rambeau
- Jeff Harlan - Mark
- Alex Hyde-White - Technician
- Alex Hyde-White - Ensign Moore
- Alex Hyde-White - Lieutenant Martin
- Cynthia Leake - Elaine
- Paul LeClair - Tarkas
- William Smith - The Trebor
- Elizabeth Stack - Vione
- Edward Power - Neil
- Michael Ansara - Kane
- Tony Carroll - Pantherman
- Brent Davis - Goneril
- Pamela Hensley - Princess Ardala
- Kelley Miles - Chandar
- Donald Petrie - Kodus
- Kenneth O'Brien - Captain
- Lavelle Roby - Thromis
- Andre Harvey - Thordis
- Chris O'Connor - Lieutenant
- Timothy O'Keefe - Bailiff
- Ken Chandler - Court Clerk
- Susan McIver - Simmons
- Mark Lenard - Ambassador Duvoe
- Len Birman - Admiral Zite
- Donn Whyte - Zykarian Jr.
- Harry Townes - The Guardian
- Harry Johnson - Carew
- BarBara Luna - Koori
- Vic Perrin - First Guardian
- Linden Chiles - Ambassador Cabot
- Vernon Weddle - Dr. Moray
- Kim Hamilton - Nurse Paulton
- Barry Cahill - Major Elif
- Stacy Keach, Sr. - Senior Officer
- David Hollander - Velis
- Bruce M. Fischer - Loran
- Russell Wiggins - Relcos
- Roger Rose - Marcos
- Diana Chesney - Hag
- Richard Wright - Onlooker
- Amanda Wyss - Laura
- Sandy Champion - Chief Petty Officer Hall
- James R. Parkes - Kovick
- Leigh C. Kim - Petrie
- Hubie Kerns Jr. - Mummy
- Anne E. Curry - Cyra Samos
- Dennis Freeman - Midshipman
- Tommy Madden - General Xenos
- John Edward Allen - General Zoman
- Tony Cox - Private Zedht
- Harry Monty - General Sothoz
- Charles Secor - General Kuzan
- John Fujioka - Hand of Goral
- William Bryant - Cowan
- Michael Horsley - Yeoman James
- Ramon Bieri - Commissioner Bergstrom
- David Hooks - General Arnheim
- John O'Connell - Major Peterson
- Thomas Bellin - Crawford
- Carl Reindel - Air Force Sergeant
- James Emery - Marine Pilot
- Eric Lawrence - Young Marine
- Devon Ericson - Asteria Eleefa
- William Kirby Cullen - Demeter
- Walker Edmiston - Koldar
- Michele Marsh - Cleis
- Brady Rubin - Syla
- Jackie Russell - Kally
- Lachelle Chamberlain - Darel
- Keith Atkinson - Joham
- Ernesto Macias - Lieutenant Garth
- Jeff David - Crichton (voice)
- Shawn Stevens - Boy
- Cameron Young - Toby Kaplin
- Glen A. Larson
- Dick Wahrman
Victor Argo interpreta a Raphael Argus en la serie.
Cesar Romero interpreta a Amos Armat en la serie.
Mark Lenard interpreta a Ambassador Duvoe en la serie.
Frank Gorshin interpreta a Seton Kellogg en la serie.
John Furlong interpreta a Cop en la serie.
Dennis Haysbert interpreta a Helmsman en la serie.
Kimberly Beck interpreta a Alison Michaels en la serie.
Anthony James interpreta a Mr. Graf en la serie.
Earl Boen hace el papel de Selmar.
Jack Palance hace el papel de Kaleel.
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