cast
-
Martin Landau
John Koenig
-
Barbara Bain
Helena Russell
-
Nick Tate
Alan Carter
-
Zienia Merton
Sandra Benes
-
Anton Phillips
Dr. Mathias
-
Catherine Schell
Maya / Servant of the Guardian
-
Barry Morse
Victor Bergman
-
Tony Anholt
Tony Verdeschi
-
Prentis Hancock
Paul Morrow
-
Clifton Jones
David Kano
- Sarah Bullen Kate
- John Hug Bill Fraser / Fraser
- Yasuko Nagazumi Yasko
-
Jeffery Kissoon
Ben Vincent
- Harry Fielder Medic (uncredited) / Security Guard (uncredited) / Gerry (uncredited) / Security Guard George (uncredited) / Command Center Technician (uncredited) / Survey Team Member (uncredited)
- Albin Pahernik Creature / Lizard Animal / Space / Kreno Animal / Maya / Creature
-
Emily Bolton
June
-
Shane Rimmer
Eagle Pilot (voice) / James Kelly / Bannion (voice) / Maintenance Section Voice (voice) (uncredited)
-
Stuart Damon
Guido Verdeschi / Parks
- Sam Dastor Ed Spencer
-
Alibe Parsons
Alibe
-
Isla Blair
Female Alien / Carla
- Laurie Davis Stewardess / Main Mission Operative (uncredited)
-
Brian Blessed
Mentor / Cabot Rowland
- James Fagan Ken Johnson
- Annie Lambert Operative
-
Peter Porteous
Petrov
-
Roy Marsden
Crael / Alien Invisible
- Laurence Harrington Jackson / Stewart
- Earl Robinson Sandstrom
-
Nicholas Young
Peter Rockwell
-
Drewe Henley
Joe Ehrlich
-
Billy J. Mitchell
Professor Hunter
- Cher Cameron Louisa
-
Al Lampert
Ken Burdett
- Robert Sheedy Henry
- Patrick Westwood Dr. Shaw
- Jeremy Young Jack Bartlett
-
Toby Robins
Diana Morris
-
John Judd
Security Guard
-
Roy Dotrice
Gerald Simmons
-
Joan Collins
Kara
-
Peter Duncan
Cantar
-
Judy Geeson
Regina Kesslan
-
Peter Bowles
Balhor
-
Bernard Kay
Humanoid
-
Leigh Lawson
Zarl
-
Bernard Cribbins
Captain Michael
-
Oliver Cotton
Spearman
-
Joanna Dunham
Vana
-
Guy Rolfe
Magus
-
Billie Whitelaw
Zamara
- Marc Zuber Security Lieutenant
-
Peter Cushing
Raan
- Stacy Dorning Zova
-
Gareth Hunt
Eagle Pilot (uncredited)
-
Nick Brimble
Ray Torens
-
Freddie Jones
Charles Logan
-
Michael Culver
Pete Irving
-
Philip Madoc
Commander Gorski
-
Geoffrey Bayldon
Number Eight
-
Valerie Van Ost
Main Mission Operative
-
Don Fellows
GTV Newscaster
- Martha Nairn Female Operative
-
Richard Johnson
Lee Russell
-
Christopher Lee
Captain Zandor
-
Caroline Mortimer
Dione
-
Maxine Audley
Theia
-
Kevin Stoney
Talos
-
Carolyn Courage
Prima ragazza
- Claire Lutter Main Mission Operative (uncredited)
- Andy Sutcliffe Main Mission Operative (uncredited)
- Andy Dempsey Main Mission Operative (uncredited)
- Maggie Wright Main Mission Operative (uncredited)
- Mary Miller Freda
-
Eric Carte
Collins
-
John Hamill
Dominix
- David Ellison Ted
-
Giancarlo Prete
Dan Mateo
-
Alex Scott
Aarchon
-
Lon Satton
Benjamin Ouma
- Eva Reuber-Staier Jane
-
Carla Romanelli
Melita Kelly
- Lawrence Trimble Steve Abrams
- Lea Brodie Hilary Preston
-
Leo McKern
Companion
-
Rula Lenska
Joan Conway
-
Orso Maria Guerrini
Luke Ferro
- Wayne Brooks Jackie
-
Barbara Kellerman
Monique Bouchere
-
Michael Sheard
Darwin King
- Dennis Burgess Neman
-
Susan Jameson
Juliet Mackie
-
Gwen Taylor
Nurse
-
Aubrey Morris
Petros High Priest
- Paul Antrim Bill Lowry
-
Robert Russell
Hadin
- Gerald Staddon Male Mute
- Jackie Horton Female Mute
-
Louise Jameson
Survivor
-
Ron Tarr
Survivor
-
Gianni Garko
Tony Cellini
-
Douglas Wilmer
Commissioner Dixon
-
Julian Glover
Jarak
-
Cyd Hayman
Sue Crawford
-
Jeremy Kemp
Ernst Linden
-
John Shrapnel
Jack Tanner
-
Anthony Valentine
Male Alien
-
Margaret Leighton
Arra
-
Ian McShane
Anton Zoref
-
Gay Hamilton
Eva Zoref
-
Roy Scammell
Jim Nordstrom
-
Paul Jones
Mike Ryan
- Jon Laurimore Smitty
-
Jan Harvey
Alpha News Service Girl
-
James Smillie
Baxter
- Alan Meacham Sandos
-
Gary Waldhorn
Winters
-
Max Faulkner
Ted Clifford
- Derek Anders Wayland
-
Hilary Dwyer
Laura Adams
-
Anthony Nicholls
James Warren
-
Anouska Hempel
Annette Fraser
-
Lisa Harrow
Anna Davis
- Gerard Paquis Lew Picard
- Margaret Inglis Mirella
- Anthony Blackett Stal
- Peggy Ledger Old Lady
- Roger Bizley MacDonald
-
Norwich Duff
Texas
- Peggy Paige Old Crone
- Michael Sharvell-Martin Brian the Robot
- Barbara Wise Girl
-
John Standing
Pasc
- Michael Gallagher Etrec
- Veronica Lang Lyra / Maurna
-
John Alkin
Johnson
-
Anthony Forrest
Carson
- Raul Newey Raul Nunez
-
Terry Walsh
Rescue Eagle Pilot
-
Godfrey James
Alien Transporter
-
David Jackson
Alien Strong
-
Patrick Mower
Dave Reilly
-
Willoughby Goddard
Taybor
- Laraine Humphrys Karen
- Mel Taylor Andrews
-
Rita Webb
Slatternly Woman
-
Jack Klaff
Security Guard
- James Leith Guard
- Ina Skriver A
-
Sarah Douglas
B
-
Robert Rietti
Sphere (voice)
-
James Laurenson
Patrick Osgood
-
Pamela Stephenson
Michelle Osgood
- Lloyd McGuire First Engineer
-
Brendan Price
Security Guard
- Alan Hunter Co-Pilot
- Nova Llewellyn Alphan Woman
- Andrew Lodge Grasshopper
- Trevor Thomas Eagle Pilot
-
Tony Osoba
Security Guard
-
Lynne Frederick
Shermeen Williams
-
Stuart Wilson
Vindrus
-
Nicholas Campbell
Eddie Collins
- Brian Osborne Mr. Potter
-
David Prowse
Cloud Creature
-
Deborah Fallender
Carolyn Powell
-
Jess Conrad
Mark Sanders
- Anthony Stamboulieh George Crato
- Michael Walker Carl Renton
- Gregory de Polnay Peter Garforth
- Lydia Lisle Sally Martin
-
Lucinda Curtis
Tessa
-
Dallas Adams
Sam
-
Ken Hutchison
Greg Sanderson
-
Carolyn Seymour
Eva
-
Nigel Pegram
Cernik
-
James Snell
Stevens
- Gyearbuor Asante Guard
-
Lee Montague
Dorzak
-
Jill Townsend
Sahala
-
Kathryn Leigh Scott
Yesta
- Paul Jerricho Security Guard
-
Hildegard Neil
Elizia
-
Cassandra Harris
Controller / Sares
-
Angus MacInnes
Jelto
- Michael Dickinson Blake Maine
- Arthur White Kinano
-
Nadim Sawalha
Zoran
-
Karl Held
Jerry Travis
- Robert Driscoll Revered One (uncredited)
- Walter McMonagle Les Johnson
-
Roy Boyd
Joe Lustig
-
Patrick Troughton
Archon
-
Ann Firbank
Consul Varda
-
Gerry Sundquist
Malic
-
Michael Halsey
Dorcon Soldier
- Kevin Sheehan Dorcon Operative
- Hamish Patrick Command Center Alphan
- Hazel McBride Medical Officer
- Hal Galili Voice
