- Virginia Hey - Pa'u Zotoh Zhaan
- Tammy Macintosh - Joolushko Tunai Fenta Hovalis
- Rebecca Riggs - Commandant Mele-On Grayza
- Paul Goddard - Stark
- Raelee Hill - Sikozu
- Lani John Tupu - Pilot
- Ron Haddrick - Yondalao
- Stephen James King - Pikal
- Tim McCunn - Caa'ta
- Nathaniel Dean - Jothee
- Judi Farr - Scarran Doctor
- Melissa Jaffer - Noranti
- Melissa Jaffer - Nilaam
- Melissa Jaffer - Female Pilot
- Linal Haft - Zelkin
- Linal Haft - Maryk
- Kim De Lury - Tarnat
- Kim De Lury - Peacekeeper Captain
- Duncan Young - Emperor Staleek
- Duncan Young - Diagnosian (voice)
- Duncan Young - Axikor
- Sandy Gore - Nurse Vreena
- Sandy Gore - Judge
- Sandy Gore - Muoma
- David Franklin - Lt. Meeklo Braca
- David Franklin - Capt. Meeklo Braca
- Sacha Horler - Prisoner Morrock
- Paul Leyden - Captain Larraq
- Alex Dimitriades - Lieutenant Velorek
- Darlene Vogel - Alexandra / Lorana
- Natalie Mendoza - Lishala
- Imogen Annesley - Niem
- David Bowers - Kurz
- Nic Bishop - Ghebb Dellos
- Salvatore Coco - Voodi
- Anja Coleby - Ponara
- John Clayton - Verell
- Elizabeth Alexander - Vella
- Christine Stephen-Daly - Lt. Teeg
- Justine Saunders - Altana
- Matt Doran - Markir Tal
- Magda Szubanski - Furlow
- John Adam - Bekhesh
- John Adam - Alien
- John Adam - Raa'Keel
- John Adam - Sgt. Learko / Lt. Jatog
- Alyssa-Jane Cook - Gilina Renaez
- Michela Noonan - Vyna
- Lucy Bell - Nurse Kelsa
- Olivia Pigeot - Marella
- Peter Kowitz - Tarr
- David Field - Ho'Ock
- Max Phipps - Pa'u Tuzak
- Basia A'Hern - Cyntrina
- Ivar Kants - Gaashah
- Alan Cinis - Officer Tarn
- Louise Crawford - Second Prisoner
- Brett Stiller - Zerbat
- Carmen Duncan - Leslie Crichton
- Noel Hodda - Charrid Leader
- Inge Hornstra - Essk
- Peter Whitford - Jabula Clan Chieftain
- Jamie Croft - 'Young' John Crichton
- Francesca Buller - Minister Akhna
- Francesca Buller - ro-NA
- Francesca Buller - M'Lee
- Francesca Buller - Raxil
- Francesca Buller - War Minister Akhna
- Colin Borgonon - Peacekeeper Weapons Officer
- Greg Blandy - Peacekeeper Guard
- Lawrence Woodward - Bio Isolation Man
- Damian de Montemas - Lieutenant Melkor
- Jodie Dry - Kyona
- Lisa Hensley - Matala
- Jeremiah Dupre - Kyr
- Christopher Truswell - Evran (voice)
- Angie Milliken - Volmae
- Angie Milliken - Yoz (voice)
- Ken Blackburn - Hybin
- Karen Jacobson - Loud speaker (voice)
- Mary Mara - Lyneea
- Boris Brkic - Ryymax
- Grant Bowler - Shaman Liko
- Jake Blundell - Lieutenant Om
- Anthony Hayes - Molnon
- Anthony Hayes - Wa
- Wadih Dona - Tauvo Crais
- Vic Rooney - Admiral Josbek
- Gerry Day - Capt. Crais' Father
- Adrian Getley - Nam Tar
- Julian Garner - Nam Tar (voice)
- Rhys Muldoon - Staanz
- John Batchelor - Kcrackic
- Kate Raison - Pa'u Tahleen
- Kevin Copeland - Rokon
- John O'Brien - Kato-Re
- Chris Haywood - Sorcerer Maldis / Igg / Haloth
- Chris Haywood - Sorcerer Maldis / Kyvan
- Deni Gordon - Priestain Neera
- Tania Yuki - Maid
- Tiriel Mora - Salis
- Phillip Gordon - Ray Wilson
- Richard Sydenham - Cobb
- Frankie Davidson - Newsstand Guy
- June Salter - Dimensional Being (voice)
- Stephen Leeder - Commander Tollona Javio
- Anthony Kierann - Lieutenant Heskon
- Marton Csokas - Br'Nee
- Anna Lise Phillips - Young Nilaam
- Aaron James Cash - Dregon Carzenova
- Aaron James Cash - Pa'u Bitaal
- Natasha Beaumont - Jannix
- Linda Cropper - Xhalax Sun
- Linda Cropper - Fento
- Patrick Ward - Zylar
- Patrick Ward - Ralnaht
- Rob Carlton - Vija
- Richard Carter - Kabaah (voice)
- Richard Carter - Ullom
- Marin Mimica - Maton Dersch
- Simone Kessell - Finzzi
- Dean Nottle - Policeman
- Jessica Wilcox - Prison Guard
- Matthew Le Nevez - Caveman Crichton
- Bianca Roe - Jenavian Charto
- Felicity Price - Princess Katralla
- Matt Day - Councilor Tyno
- Tina Bursill - Empress Novia
- Felix Williamson - Prince Clavor
- Peter Carroll - Gahv
- Malcolm Kennard - Meelak
- Skye Wansey - Varla
- Simon Bossell - Nerri
- David Wheeler - Captain Selto Durka
- Jason Chong - General Rahzaro
- Jason Chong - E'Alet
- David Bowers - Kurz
- Tyler Coppin - Robert Schelmacher
- Tyler Coppin - Sheriff
- Nicholas McKay - Cargn (voice)
- Nicholas McKay - Naj Gil (voice)
- Nicholas McKay - Tak (voice)
- Jason Clarke - Captain Jenek / Letchner
- Jason Clarke - Captain Jenek
- Jeremy Sims - Rorf
- Phillip Hinton - Teurac (voice)
- Claudia Karvan - Natira
- Matthew Newton - Ka Jothee
- Leeanna Walsman - Borlik
- Nicholas Hope - Akkor
- Nicholas Hope - Kreetago
- Danny Adcock - Co-Kura Strappa
- Danny Adcock - T'raltixx
- Jessica Fallico - Alien Girl
- Victoria Longley - Neeyala
- Dan Spielman - Sub-Officer Dacon
- Kerith Atkinson - Shreena
- Brian Carbee - Lastren
- Marshall Napier - General Grynes
- Terry Serio - Colonel Lennok
- Sean Masterson - Rovhu Pilot (voice)
- Rebecca Gibney - Rinic Sarova
- Robert Bruning - Rinic Bralanoth
- Julieanne Newbould - Felor
- Ian Bliss - Scientist Drillic
- Tux Akindoyeni - Pilot Rinon
- John Brumpton - Katoya
- John Brumpton - B'Sogg
- Sam Healy - Rylani Jeema Dellos
- Stephanie Jacobsen - Nurse Froy
- William Zappa - Captain Molayne
- Susan Lyons - Sierjna
- Mark Mitchell - Mu-Quillus
- Tamblyn Lord - Fe'Tor
- Laura Keneally - Theladh
- Anthony Martin - Mitols
- Ray Anthony - Alcar
- Kate Beahan - Hubero
- Alexandra Fowler - Orrhn (voice)
- Ben Mendelsohn - Sko
- Sean Taylor - Lt. Reljik
- Lewis Fitz-Gerald - Kor Tosko
- Paul Shedlowich - Plint
- Royston Innes - PK Doctor
- Lenore Smith - Lt. Darinta Larell
- Sheridan Rynne - Brenna
- Marta Dusseldorp - Officer Yal Henta
- Ross Sharp - Scorpius Aide
- Peter Whittle - Ilkog
- Mark McCannon - Grudek #1
- Shane Briant - Dr. Trayso Talnell
- Shane Briant - Kaarvok
- Dinah Shearing - Elack's Pilot (voice)
- Steve Le Marquand - Oo-Nii
- Jack Finsterer - Gleeg
- Alan Flower - Frool
- Ross Newton - Sloggard
- Teo Gebert - Weldon
- John Schwarz - Bintog
- Ashley Fairfield - Coreeshi
- Bruce Spence - Prefect Falaak
- Barry Otto - Dr. Tumii
- Sara Groen - Mujombre
- Kelly Butler - Selva
- Nadia Townsend - Kim Kupperstein
- Susan Prior - Kiryah
- Casey Burgess - Olivia Crichton
- Louise Fox - Dot Levy
- Kosta Doukas - Deputy
- Murray Bartlett - Douglas 'D.K.' Knox
- Geoff Morrell - T.R. Holt
- Paula Arundell - Talikaa
- Erika Heynatz - Caroline Wallace
- Chris Pitman - Trader
- Walter Grkovic - Outurak
- Blair Venn - Macton
- Rachel Gordon - Lo'Laan
- Peter Lamb - Rekka
- Paula Iland - Receptionist
- Nick Tate - R. Wilson Munroe
- Joshua Anderson - Bobby Cole
- Nicholas Hammond - Dr. Adrian Walker
- Sarah Enright - Olivia Crichton
- Michael Barnacoat - Ivan Chanderpaul
- Dee Donavan - Dr. Jason Fletcher
- John Gregg - Talyn Lyczac
- Kent McCord - Jack Crichton
- Mike Duncan - Assassination Victim
- Rel Hunt - Karohm
- Ben Dalton - Zepa
- Dean O'Gorman - Zukash
- David Downer - Secretary Vakali
- Jonny Pasvolsky - Pennoch
- Lesley Parker
- Brian Henson
- Robert Halmi Jr.
- Marianne Jade
- Rockne S. O'Bannon
- Martin G. Baker
- Les Fiddess
- David White
- Guy Gross
Kent McCord hace el papel de Jack Crichton.
Darlene Vogel interpreta a Alexandra / Lorana en la serie.
Matt Day interpreta a Councilor Tyno en la serie.
Chris Haywood interpreta a Sorcerer Maldis / Kyvan en la serie.
Ben Browder hace el papel de John Crichton.
Claudia Black interpreta a Aeryn Sun en la serie.
Hugh Keays-Byrne interpreta a Grunchlk en la serie.
Jonathan Hardy hace el papel de Dominar Rygel XVI (voice).
Anthony Simcoe interpreta a Ka D'Argo en la serie.
John Bach hace el papel de Einstein.
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