- Laurette Spang - Cassiopeia
- Melody Anderson - Brenda Maxwell
- Peter MacLean - President
- Edward Mulhare - John
- Nehemiah Persoff - Eastern Alliance Leader
- Logan Ramsey - Moore
- Ken Swofford - General Maxwell
- Fred Astaire - Chameleon / Captain Dimitri
- Ana Alicia - Aurora
- Paul Fix - Commander Kronus
- Nick Holt - Charka
- Randy Stumpf - Damon
- Richard Styles - Hermes
- Jonathan B. Woodward - Robus
- Barry Nelson - Bogan
- Lew Ayres - President Adar
- Wilfrid Hyde-White - Anton
- John Fink - Dr. Payne
- Rick Springfield - Lieutenant Zac
- Ray Milland - Sire Uri
- Gay Thomas Wilson - Warrior
- Jane Seymour - Serina
- Sheila Wills - Lieutenant Deitra
- Millicent Crisp - Warrior
- Katherine Cannon - Vella
- Johnny Timko - Puppis
- Claude Earl Jones - Lacerta
- Red West - Marco
- Carol Baxter - Macy
- Marneen Fields - Fighter Pilot
- Rex Cutter - Red Eye
- James Whitmore Jr. - Robber
- Ted Gehring - Croad
- Sean McClory - Assault 9
- Arlene Martel - Adulteress 58
- Ian Abercrombie - Forger 7
- Robert Hathaway - Enforcer
- Nancy DeCarl - Slayer
- Cathey Paine - C.O.R.A. (voice)
- Larry Cedar - Cadet Shields
- Richard Milholland - Killian
- Dan O'Herlihy - Dr. Ravashol
- Ed Begley Jr. - Flight Sergeant Greenbean
- Ed Begley Jr. - Ensign Greenbean
- Larry Manetti - Giles
- Paul Coufos - Guard
- Paul Coufos - Pilot
- Christine Belford - Leda
- Denny Miller - Ser 5-9
- Roy Thinnes - Croft
- Alan Stock - Cadet Cree
- Britt Ekland - Tenna
- Walt Davis - Vickers
- Richard Lynch - Wolfe
- Curtis Credel - Haals
- James Olson - Thane
- Brett Somers - Siress Belloby
- Dennis Fimple - Duggy
- Eric Server - Dipper
- Rance Howard - Farnes
- Ben Frommer - Nogow
- Charles Bloom - Kyle
- Bruce Glover - Megan
- Audrey Landers - Miri
- Brigitte Muller - Ariadne
- Adam Mann - Nilz
- Junero Jennings - Pegasus Launch Officer
- Alex Hyde-White - Cadet Bow
- Alex Hyde-White - Pilot
- Lloyd Bridges - Commander Cain
- Rod Haase - Flight Officer Tolan
- Jeff MacKay - CPI Komma
- Jeff MacKay - Crewman
- Jeff MacKay - Corporal Komma
- William Bryant - Fire Leader
- Janet Julian - Lieutenant Brie
- Bruce Wright - Guard
- Bruce Wright - First Lieutenant
- Bruce Wright - Corporal Lomas
- Olan Soule - Carmichael
- Harry Johnson - Pilot
- Kirk Alyn - Old Man
- Paula Victor - Old Woman
- John Williams - Sire Montrose
- Leann Hunley - Warrior
- Leann Hunley - Pilot
- Jonathan Harris - Lucifer (voice)
- Jonathan Harris - Lucifer
- Jonathan Harris - Lucifer (voice) (uncredited)
- Norman Stuart - Statesman
- Anne Jeffreys - Siress Blassie
- Murray Matheson - Statesman Geller
- Murray Matheson - Specter (voice)
- Dan Barton - Crewman
- John Holland - Waiter
- Lyman Ward - Pallon / Karibdis
- Frank Ashmore - Flight Sergeant Ortega
- Ben Frank - Chella / Riftis
- W.K. Stratton - Lieutenant Barton
- Newell Alexander - Elias
- Patricia Stich - Zara
- Patrick Macnee - Opening Credit Announcer / Imperious Leader (voice) (uncredited)
- Patrick Macnee - Count Iblis
- Patrick Macnee - Imperious Leader (voice)
- Frank Parker - Zed
- Ted Noose - Official
- Brock Peters - Chief Opposer Solon
- Ted Hamaguchi - Crewman
- Ted Hamaguchi - Helmsman
- Don Mantooth - MedTech
- Sarah Rush - Flight Corporal Rigel
- George Murdock - Dr. Salik
- John Dullaghan - Dr. Wilker
- Randolph Mantooth - Michael
- Kelly Harmon - Sarah
- Bobby Van - Hector
- Ray Bolger - Vector
- Curt Lowens - Krebbs
- Lesley Woods - Aggie Moreland
- Felix Silla - Lucifer
- Felix Silla - Lucifer (uncredited)
- Frank Marth - Josh Moreland
- Ron Kelly - Security Officer Reese
- Alex Rodine - Lanceman
- Gary Vinson - Doyle
- Lester Fletcher - Donner
- Gillian Greene - Melanie
- Kimberly Woodward - Loma
- Ina Balin - Siress Tinia
- Robert Feero - Bora
- Anthony De Longis - Taba
- Paul LeClair - Guard
- Lloyd Bochner - Commandant Leiter
- Paul Tinder - Guard
- Sidney Clute - Stone
- Ken Lynch - Dr. Horning
- Jordan Rhodes - Brace
- Lance LeGault - Maga
- Lance LeGault - Bootes
- John de Lancie - Officer
- Russ Marin - Alliance Member
- Milton James - Alliance Leader
- Robert Murvin - Duty Officer
- James R. Parkes - Mutineer
- Michael Horsley - Mutineer
- David Greenan - Flight Officer Omega
- Anne Lockhart - Lieutenant Sheba
- Glen A. Larson
- Stu Phillips
George Murdock interpreta a Dr. Salik en la serie.
Brock Peters interpreta a Chief Opposer Solon en la serie.
Nehemiah Persoff interpreta a Eastern Alliance Leader en la serie.
Ken Lynch interpreta a Dr. Horning en la serie.
Lloyd Bridges interpreta a Commander Cain en la serie.
Lew Ayres hace el papel de President Adar.
Alex Hyde-White interpreta a Pilot en la serie.
Lorne Greene interpreta a Commander Adama en la serie.
Dirk Benedict interpreta a Lt. Starbuck en la serie.
Richard Hatch interpreta a Capt. Apollo en la serie.
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