- Peter Tuddenham - Zen / ORAC
- Peter Tuddenham - Zen
- Peter Tuddenham - Slave / ORAC
- Gareth Thomas - Roj Blake
- Steven Pacey - Del Tarrant
- Jan Chappell - Cally
- Jan Chappell - Cally (voice) (uncredited)
- Glynis Barber - Soolin
- Glynis Barber - Mutoid
- Brian Croucher - Travis
- Brian Croucher - Space Commander Travis
- Morris Barry - Dr. Wiler
- Suzan Farmer - Meegat
- David Sterne - Guard
- Juliet Hammond-Hill - Pella
- Peter Byrne - Justin
- Richard Hurndall - Nebrox
- Michael Gough - Hower
- Darien Angadi - Ro
- John Abineri - Ushton
- Ian Cullen - Base Commander Escon
- Richard Bebb - Ven Glynd
- Derek Farr - Ensor
- Bobbie Brown - Zeeona
- T. P. McKenna - Sarkoff
- Ian Barritt - Ultra 3
- Vernon Dobtcheff - The Chairman
- Stratford Johns - Belkov
- Sabina Franklyn - Chesil
- Leslie Schofield - Sub-Commander Raiker
- Michael Troughton - Pilot Four-Zero
- Harriet Philpin - Alta Two
- David Quilter - The Tracer
- Beth Morris - Sara
- Lynda Bellingham - Vena
- Candace Glendenning - Rashel
- Cy Grant - Hal Mellanby
- Paul Shelley - Major Provine
- David Haig - Forres
- Damien Thomas - Atlan
- Roy Kinnear - Keller
- John Hollis - Lom
- Geoffrey Burridge - Dorian
- Richard Beale - Saymon
- Carol Hawkins - Kerril
- Julian Glover - Professor Kayn
- Isla Blair - Sinofar
- Aubrey Woods - Krantor
- Bruce Purchase - Gola
- Paul Daneman - Dr. Bellfriar
- Carol Royle - Mutoid
- William Squire - Kommissar
- Kevin Lloyd - Trooper Par
- Valentine Dyall - Nori
- Stephen Yardley - Investigator Reeve
- Karl Howman - Bek
- Roy Boyd - Zukan
- Alan Lake - Chel
- Kathleen Byron - Clonemaster Fen
- Betty Marsden - Verlis
- John Westbrook - Muller
- Tom Chadbon - Del Grant
- Dicken Ashworth - Gunn-Sar
- Brian Capron - Rafford
- Malcolm Stoddard - Leitz
- Marc Zuber - Tarvin
- Yolande Palfrey - Veron
- Jacqueline Pearce - Servalan
- Arthur Hewlett - Old Man
- Glyn Owen - Commander Leylan
- Stephen Greif - Space Commander Travis
- Alison Glennie - Kate
- Ronald Leigh-Hunt - C.A. One
- Patsy Smart - Giroc
- Sylvia Coleridge - Croupier
- Primi Townsend - Zee
- Rosalind Bailey - Gambit (voice)
- Michael Melia - Federation Trooper
- Colin Baker - Bayban
- Souad Faress - Selma
- Ronald Lacey - Tynus
- Tony Caunter - Ensor Jr.
- Christopher Neame - Colonel Quute
- John Bennett - Coser
- Caroline Holdaway - Piri
- Andrew Robertson - Space Commander
- Gillian McCutcheon - Kostos
- David Neal - Gerren
- Judy Buxton - Inga
- Pamela Salem - Kara
- Jack McKenzie - Patar
- Robert Morris - Major Hunda
- Astley Jones - Eldon
- Ric Young - Ginka
- David Ryall - Selman
- Brian Blessed - Vargas
- Robert Russell - Laran
- Robert Beatty - Bran Foster
- Robert James - Ven Glynd
- Jeremy Wilkin - Dev Tarrant
- Pippa Steel - Maja Veron
- Gillian Bailey - Ravella
- Margaret John - Arbiter
- Susan Field - Alta Morag
- Brett Forrest - Krell
- Norman Tipton - Navigator Idas
- Norman Tipton - Navigator Artix
- Tom Kelly - Nova
- Michael MacKenzie - Dainer
- Peter Childs - Arco
- Bill Weston - Garton
- Tony Smart - 1st Alien
- Frank Henson - Alien
- Ania Marson - Geela
- Barry Jackson - Dr. Kendall
- Nigel Humphreys - Sonheim
- Kate Coleridge - Levett
- John Bryans - Senator Bercol
- John Bryans - Shrinker
- Carl Forgione - Grovane
- David Bailie - Chevner
- John Rolfe - Terloc
- Michael Halsey - Tel Varon
- Michael Halsey - Zee
- Ian Thompson - Farren
- Christian Roberts - Dr. Renor
- Carinthia West - Tyce
- Peter Craze - Prell
- Peter Craze - Servalan's Assistant
- James Lister - Space Surgeon Maryatt
- John Savident - Fleet Warden-General Samor
- John Savident - Egrorian
- Sheila Ruskin - Alta One
- Roy Evans - Slave
- Adrienne Burgess - Hanna
- Derek Smith - Largo
- Scott Fredericks - Carnell
- Brian Miller - Assistant Kommissar
- Kevin Stoney - Ardus
- Kevin Stoney - Councillor Joban
- Alan Halley - Arie
- John Leeson - Toise
- John Leeson - Pasco
- Sue Bishop - Mutoid
- Claire Lewis - Zil
- Colin Farrell - Gambrill
- Colin Higgins - Tak
- James Coyle - Molok
- Julia Vidler - Avalon
- Julia Vidler - Barr
- James Kerry - Cauder
- Lindy Alexander - Ralli
- Sidney Kean - Vetnor
- Nigel Gregory - Arrian
- Frieda Knorr - Governor Le Grand
- Denis Carey - Docholli
- Nicolette Roeg - Chenie
- Deep Roy - Moloch (voice)
- Deep Roy - Decima
- Deep Roy - The Klute
- Freda Jackson - Tara
- Shaun Curry - Rod
- John Bown - Durkim
- Gareth Armstrong - Parton
- Jenny Twigge - Lurena
- David Webb - Stot
- Paul Toothill - Marcol
- Michael Maynard - Leeth
- Sally Harrison - Lauren Mellanby
- Richard Franklin - Federation Trooper
- Michael Sheard - Klegg
- Doyne Bird - Harmon
- Helen Blatch - Receptionist
- Malcolm Bullivant - Bershar
- Ben Howard - Mori
- Judy Matheson - Mutoid
- Sam Dastor - The Caliph
- Terry Scully - Groff
- Marcus Powell - The Thaarn
- Andrew Burt - Ven Jarvik
- Frank Gatliff - Dastor
- Anthony Gardner - Captain Shad
- John J. Carney - Sherm
- Beth Harris - C.A. Two
- Donald Douglas - Major Grenlee
- David Gillies - Hob
- Philip Bloomfield - Balon
- Stuart Fell - Dortmunn
- Stuart Fell - Subterron
- Stuart Fell - Goth Warrior
- Lorna Heilbron - Sula
- Stephen Jenn - Ultra 2
- Davyd Harries - Doran
- Debbi Blythe - Poola
- John Hartley - Section Leader Grose
- Mark Sheridan - Unit Commander Lector
- Paul Mark Elliott - Vinni
- Stewart Bevan - Max
- David Sibley - Commentator
- Heather Wright - Reeval
- Richard Clifford - Toron
- Paul Ridley - Cato
- John Quentin - Practor
- Edgar Wreford - Forbus
- Nick Brimble - General
- Neil Dickson - Avandir
- Cyril Appleton - Sgt. Hask
- George Lee - Igin
- Barbara Shelley - Dr. Plaxton
- Peter Sands - Bomber
- Leonard Kavanagh - Napier
- William Lindsay - Captain
- Max Harvey - Borr
- David Boyce - Og
- Douglas Fielding - Technician
- Peter Attard - Benos
- Adam Blackwood - Tok
- Daniel Hill - Chasgo
- Jonathan David - Don Keller
- Antony Brown - Doctor Slaten
- Norman Hartley - Captain Kennedy
- Larry Noble - Pinder
- Dean Harris - Finn
- Rick James - Chalsa
- Charles Augins - Lod
- Simon Merrick - Boorva
- Brian Spink - Mida
- David Collings - Deva
- Sasha Mitchell - Arien
- Janet Lees-Price - Klyn
- Mark Holmes - Guard
- Mark York - Sub-Commander Cheney
- Derrick Branche - Amagon Guard
- Terence Plummer - Scavenger
- Terry Richards - Scavenger
- Les White - Alta Guard
- Terry Yorke - Alta Guard
- Graham Simpson - Officer
- Peter Miles - Secretary Rontane
- Victoria Fairbrother - Major Thania
- Paul Grist - Cevedic
- Harry Jones - Jarriere
- Pat Gorman - Trantinian planet hopper Captain
- Ron Tarr - Patrol Leader
- Paul Weston - Goth Warrior
- Hugh Dickson - Keldon Traffic Controller
- Michael Spice - Nova Queen Pilot (voice)
- Martyn Read - Nagu
- Michael Gaunt - Dr. Bax
- David Hayward - Teague
- Vere Lorrimer
- Dudley Simpson
Deep Roy interpreta a Moloch (voice) en la serie.
Roy Kinnear interpreta a Keller en la serie.
Vernon Dobtcheff hace el papel de The Chairman.
Ronald Lacey hace el papel de Tynus.
Aubrey Woods hace el papel de Krantor.
David Bailie hace el papel de Chevner.
Michael Gough hace el papel de Hower.
Julian Glover interpreta a Professor Kayn en la serie.
Isla Blair hace el papel de Sinofar.
Robert Beatty interpreta a Bran Foster en la serie.
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