Commander John Koenig (48 episodes, 1975-1977)
Dr. Helena Russell (48 episodes, 1975-1977)
Alan Carter (42 episodes, 1975-1977)
Sandra Benes (35 episodes, 1975-1977)
Main Mission Operative Kate Bullen (1 episode, 1975-1977)
Professor Victor Bergman (24 episodes, 1975-1976)
Maya / Servant of the Guardian (25 episodes, 1975-1977)
Paul Morrow (23 episodes, 1975-1976)
David Kano (23 episodes, 1975-1976)
Dr. Bob Mathias (23 episodes, 1975-1976)
Tony Verdeschi (23 episodes, 1976-1977)
Bill Fraser (9 episodes, 1976-1977)
Yasko (8 episodes, 1976-1977)
Dr. Ben Vincent (7 episodes, 1976-1977)
Creature / Lizard Animal / Kreno Animal / Maya / Space (6 episodes, 1976-1977)
Main Mission Operative Julie Tracy (2 episodes, 1975-1976)
Eagle Pilot / James Kelly / Maintenance Section Voice / Voice of Bannion (1 episode, 1975-1976)
Luke Ferro / Sphere / Voice of Cellini / Voice of Mateo (1 episode, 1975-1976)
Guido Verdeschi / Parks (3 episodes, 1975-1977)
Dr. Ed Spencer (3 episodes, 1977)
Alibe (3 episodes, 1977)
Petrov (2 episodes, 1976)
Alien Voice / Alien Strong (1 episode, 1976-1977)
Information Girl / Karen / Vegan (1 episode, 1975-1976)
Guard / Launch Area Security Guard / Security Guard (1 episode, 1976-1977)
Commissioner Gerald Simmonds (2 episodes, 1975)
Dr. Cabot Rowland / Mentor (2 episodes, 1975-1976)
Carla / Female Alien (2 episodes, 1975-1976)
Alien Invisible / Crael (2 episodes, 1976-1977)
Diana Morris (2 episodes, 1977)
Jack Bartlett (2 episodes, 1977)
Jackson / Stewart (2 episodes, 1976-1977)
Joe Ehrlich (2 episodes, 1977)
2nd Security Guard (2 episodes, 1976-1977)
Dr. Shaw (2 episodes, 1977)
Louisa (2 episodes, 1977)
Ken Burdett (2 episodes, 1977)
Professor Hunter (2 episodes, 1977)
Sandstrom (2 episodes, 1977)
Henry (2 episodes, 1977)
Peter Rockwell (2 episodes, 1977)
Main Mission Operative / Security Lieutenant (1 episode, 1975-1976)
Cousteau / Stevens (1 episode, 1976-1977)
Anton Zoref (1 episode, 1975)
Kara (1 episode, 1975)
Jarak (1 episode, 1975)
Regina Kesslann (1 episode, 1975)
Companion Gwent (1 episode, 1976)
Lee Russell (1 episode, 1975)
Dr. Ernst Linden (1 episode, 1975)
Balor (1 episode, 1975)
Male Alien (1 episode, 1975)
Arra (1 episode, 1975)
Mike Ryan (1 episode, 1975)
Tony Cellini (1 episode, 1975)
Luke Ferro (1 episode, 1975)
Vana (1 episode, 1976)
Dione (1 episode, 1976)
Dan Mateo (1 episode, 1976)
Captain Zantor (1 episode, 1975)
Capt. Jack Tanner (1 episode, 1975)
Anna Davis (1 episode, 1975)
Sue Crawford (1 episode, 1975)
Commissioner Dixon (1 episode, 1975)
Eva Zoref (1 episode, 1975)
Jim Haines (1 episode, 1975)
Neman (1 episode, 1975)
Shermeen Williams (1 episode, 1976)
Raan (1 episode, 1976)
Captain Michael (1 episode, 1976)
Laura Adams (1 episode, 1976)
Taybor (1 episode, 1976)
Melita Kelly (1 episode, 1976)
A (1 episode, 1976)
Elizia (1 episode, 1977)
Petros High Priest (1 episode, 1975)
B (1 episode, 1976)
Patrick Osgood (1 episode, 1976)
Vindrus (1 episode, 1976)
Dr. Charles Logan (1 episode, 1976)
Pasc (1 episode, 1976)
Dave Reilly (1 episode, 1976)
Magus (1 episode, 1976)
Dr. James Warren (1 episode, 1976)
Alien Transporter (1 episode, 1976)
Archon (1 episode, 1977)
Zoran (1 episode, 1977)
Dorzak (1 episode, 1977)
Cloud Creature (1 episode, 1976)
Michelle Osgood (1 episode, 1976)
Zamara (1 episode, 1976)
Humanoid (1 episode, 1976)
Carolyn Powell (1 episode, 1976)
Cantar (1 episode, 1976)
Etrec (1 episode, 1976)
Jerry Travis (1 episode, 1977)
Consul Varda (1 episode, 1977)
Sahala (1 episode, 1977)
Greg Sanderson (1 episode, 1977)
Interrogator (1 episode, 1977)
Winters (1 episode, 1976)
Eddie Collins (1 episode, 1976)
Mark Sanders (1 episode, 1976)
Zarl (1 episode, 1976)
Annette Fraser (1 episode, 1976)
Zova (1 episode, 1976)
Brian / Robot (1 episode, 1976)
Lyra / Maurna (1 episode, 1976)
Female Operative (1 episode, 1976)
Controller / Sares (1 episode, 1977)
Eva Lewis (1 episode, 1977)
Yesta (1 episode, 1977)
Malic (1 episode, 1977)
Spearman (1 episode, 1975)
Commander Anton Gorski (1 episode, 1975)
Number Eight (1 episode, 1976)
1st Security Guard (1 episode, 1976)
First Engineer (1 episode, 1976)
Theia (1 episode, 1976)
Johnson (1 episode, 1976)
Ted Clifford (1 episode, 1976)
Mirella (1 episode, 1976)
Mr. Potter (1 episode, 1976)
George Crato (1 episode, 1976)
Guardian's Brother (1 episode, 1976)
Jelto (1 episode, 1977)
Cernik (1 episode, 1977)
Pete Irving (1 episode, 1975)
Baxter (1 episode, 1975)
Smitty (1 episode, 1975)
Benjamin Ouma (1 episode, 1975)
Talos (1 episode, 1976)
Slatternly Woman (1 episode, 1976)
Security Guard (1 episode, 1976)
Lew Picard (1 episode, 1976)
MacDonald (1 episode, 1976)
Guard (1 episode, 1976)
Carl Renton (1 episode, 1976)
Beautiful Girl (1 episode, 1976)
Stal (1 episode, 1976)
Clea (1 episode, 1977)
Kinano (1 episode, 1977)
Voice (1 episode, 1977)
Dr. Monique Bouchere (1 episode, 1975)
Mark Dominix (1 episode, 1975)
Aarchon (1 episode, 1975)
Collins (1 episode, 1975)
Freda (1 episode, 1975)
Bill Lowry (1 episode, 1975)
Jackie (1 episode, 1975)
Peter Garforth (1 episode, 1976)
Refuel Eagle Pilot (1 episode, 1976)
Carson (1 episode, 1976)
First Girl (1 episode, 1976)
Wayland (1 episode, 1976)
Co-Pilot (1 episode, 1976)
Old Lady (1 episode, 1976)
Andrews (1 episode, 1976)
Ed Malcolm (1 episode, 1977)
Guard (1 episode, 1977)
Blake Maine (1 episode, 1977)
1st Dorcon Operative (1 episode, 1977)
Dr. Darwin King (1 episode, 1975)
Hadin (1 episode, 1975)
Jane (1 episode, 1975)
Steve Abrams (1 episode, 1975)
Ray Torens (1 episode, 1976)
Sally Martin (1 episode, 1976)
1st Operative Texas (1 episode, 1976)
1st Alphan Woman (1 episode, 1976)
Grasshopper (Captain Duro) / Psychon (1 episode, 1976)
Dr. Raul Nunez (1 episode, 1976)
1st Dorcon Soldier (1 episode, 1977)
Les Johnson (1 episode, 1977)
Professor Juliet Mackie (1 episode, 1975)
Male Mute (1 episode, 1975)
Tessa (1 episode, 1976)
The Old Crone (1 episode, 1976)
Joe Lustig (1 episode, 1977)
1st Security Guard (1 episode, 1977)
Command Center Alphan (1 episode, 1977)
Female Mute (1 episode, 1975)
Sam (1 episode, 1976)
Female Medical Officer (1 episode, 1977)
Outdoor Alphan (1 episode, 1976)
Security Guard / Security Guard Pierre / Security Guard Pierce Quinton / Moonbase Alpha guard / Security Guard Pierce (uncredited) (32 episodes, 1975-1977)
Main Mission Operative (uncredited) (23 episodes, 1975-1976)
Tanya Aleksandr / Tanya Alexandr (uncredited) (22 episodes, 1975-1976)
Security Guard Tony Allan (uncredited) (20 episodes, 1975-1976)
Main Mission Operative Lee Oswald (uncredited) (18 episodes, 1975-1976)
Operative / Alphan / Nurse / Maya Transformation / Receptionist / Survivor (uncredited) (17 episodes, 1975-1977)
Main Mission Operative / Alphan / Entran Prisoner / Patient (uncredited) (16 episodes, 1975-1977)
Main Mission Operative (uncredited) (16 episodes, 1975-1976)
Peter Reeves (uncredited) (15 episodes, 1976-1977)
Operative / Nurse / Cavewoman / Number / Technician (Corridor) / Thulian (uncredited) (14 episodes, 1975-1977)
Security Guard / Elevator Security Guard (uncredited) (11 episodes, 1975-1977)
Computer Voice / Computer voice / Computer (uncredited) (9 episodes, 1975-1976)
Command Center Operative / Operative (uncredited) (8 episodes, 1976)
Security Guard / Astronaut in Corridor / Audience Member / Injured Security Guard / Main Mission Operative (uncredited) (7 episodes, 1975-1977)
Medic / Command Center Technician / Gerry / Security Guard / Security Guard George / Survey Team Member (uncredited) (7 episodes, 1976-1977)
Medic / Caveman / Main Mission Operative / Medical Astronaut (uncredited) (6 episodes, 1975-1976)
Main Mission Operative (uncredited) (6 episodes, 1975-1976)
Les Johnston / Life Support Guard / Main Mission Operative / Partying Alphan / Security Guard (uncredited) (5 episodes, 1975-1977)
Operative June (uncredited) (5 episodes, 1975-1976)
Security Guard / Alphan on Balcony / Overseer / Steiner (uncredited) (5 episodes, 1975-1976)
Main Mission Operative Anna Wong / Anna Wong / Main Mission Operative / Nurse (uncredited) (5 episodes, 1975-1976)
Ken Johnson / Pilot Pete Johnson (uncredited) (5 episodes, 1975-1976)
Main Mission Operative Lew / Medical Security Guard / Security Guard / Technician (uncredited) (4 episodes, 1975-1977)
Technician (uncredited) (4 episodes, 1975-1976)
Main Mission Operative / Main Mission Operative Ann (uncredited) (4 episodes, 1975-1976)
Nurse (uncredited) (4 episodes, 1975-1976)
Main Mission Operative / Operative (uncredited) (4 episodes, 1975-1976)
Medic / Communications Controller Toshiro Fujita / Toshiro Fujita (uncredited) (4 episodes, 1975)
Clan Guard / Rescue Eagle Pilot / Security Guard / Technician with Petrov (uncredited) (4 episodes, 1976-1977)
Security Guard / Clansman / Garth (uncredited) (4 episodes, 1976-1977)
Space Animal / Jim Nordstrom (uncredited) (3 episodes, 1975-1977)
Technician / Technicican (uncredited) (3 episodes, 1975-1976)
Main Technician / Main Mission Technician (uncredited) (3 episodes, 1975-1976)
Eagle Pilot / Ed Davis / Thulian (uncredited) (3 episodes, 1975-1976)
Main Mission Operative / Operative (uncredited) (3 episodes, 1975-1976)
Main Mission Operative / Nurse (uncredited) (3 episodes, 1975-1976)
Main Mission Operative / Rescue Worker (uncredited) (2 episodes, 1975-1976)
Alphan Medic / Vegan (uncredited) (2 episodes, 1975-1976)
Technician (uncredited) (2 episodes, 1975-1976)
Main Mission Operative (uncredited) (2 episodes, 1975-1976)
Clansman / Security Guard (uncredited) (2 episodes, 1975-1976)
Alien Girl / Darian (uncredited) (2 episodes, 1975-1976)
Technician / Thulian (uncredited) (2 episodes, 1975-1976)
Alphan / Main Mission Operative (uncredited) (2 episodes, 1975-1976)
Hilary Preston / Stewardess 1 (uncredited) (2 episodes, 1975)
Main Mission Operative (uncredited) (2 episodes, 1975)
Astronaut Ellis / Security Guard (uncredited) (2 episodes, 1975)
An astronaut / Security Guard (uncredited) (2 episodes, 1975)
Nurse (uncredited) (2 episodes, 1975)
Alphan in corridor #2 / Guard (uncredited) (2 episodes, 1976-1977)
Nurse / Technician (uncredited) (2 episodes, 1976)
Number / White-haired Alphan (uncredited) (2 episodes, 1976)
Dorcon Soldier / Hunted Man (uncredited) (2 episodes, 1977)
Survivor (uncredited) (1 episode, 1975)
Thule Girl (uncredited) (1 episode, 1975)
Nurse (uncredited) (1 episode, 1975)
Main Mission Operative (uncredited) (1 episode, 1975)
Joan Conway (uncredited) (1 episode, 1975)
Alpha News Service Girl (uncredited) (1 episode, 1975)
Eagle Pilot (uncredited) (1 episode, 1975)
Technicican (uncredited) (1 episode, 1975)
Newscaster (uncredited) (1 episode, 1975)
GTV Newscaster (uncredited) (1 episode, 1975)
Eagle Technician (uncredited) (1 episode, 1975)
Kaldorian (uncredited) (1 episode, 1975)
Security Guard (uncredited) (1 episode, 1975)
Revered One (uncredited) (1 episode, 1975)
Ted (uncredited) (1 episode, 1975)
Depot Security (uncredited) (1 episode, 1975)
Eagle One Co-Pilot (uncredited) (1 episode, 1975)
Aggressive Main Mission Operative (uncredited) (1 episode, 1975)
Young (Technical) (uncredited) (1 episode, 1975)
Voice of Davis (uncredited) (1 episode, 1975)
Thulian (uncredited) (1 episode, 1975)
Prof. Angela Robinson (uncredited) (1 episode, 1975)
Bannion (uncredited) (1 episode, 1975)
Sandos (uncredited) (1 episode, 1975)
Medic (uncredited) (1 episode, 1975)
Morrow's Daughter (uncredited) (1 episode, 1975)
Astronaut Jackson (uncredited) (1 episode, 1975)
Technician (uncredited) (1 episode, 1975)
Darian in spacesuit (uncredited) (1 episode, 1975)
Morrow's Son (uncredited) (1 episode, 1975)
Stewardess 2 (uncredited) (1 episode, 1975)
Eric Sparkman (uncredited) (1 episode, 1975)
Technician (Eagle box stacking) (uncredited) (1 episode, 1975)
Alphan in Corridor (uncredited) (1 episode, 1975)
Nurse in Corridor (uncredited) (1 episode, 1975)
Operative Michael (uncredited) (1 episode, 1975)
Frank Warren (uncredited) (1 episode, 1975)
Flight Engineer George Osgood (uncredited) (1 episode, 1975)
Barbara (uncredited) (1 episode, 1976)
That's (uncredited) (1 episode, 1976)
Overseer (uncredited) (1 episode, 1976)
Alien in cave (uncredited) (1 episode, 1976)
Tall Alien in Cave (uncredited) (1 episode, 1976)
Medical Security Guard (uncredited) (2 episodes, 1976-1977)
Alphan Girl (uncredited) (1 episode, 1976)
Clansman (uncredited) (1 episode, 1976)
Psychon (uncredited) (1 episode, 1976)
Second Mining Engineer (uncredited) (1 episode, 1976)
Running Technician (uncredited) (1 episode, 1976)
Decontamination Operative (uncredited) (1 episode, 1976)
Ape Man (uncredited) (1 episode, 1976)
Short alien in cave (uncredited) (1 episode, 1976)
Spirit Mateo (uncredited) (1 episode, 1976)
Gorilla (uncredited) (1 episode, 1976)
Security Guard (uncredited) (1 episode, 1976)
Vegan (uncredited) (1 episode, 1976)
Musician (uncredited) (1 episode, 1976)
Nurse (uncredited) (1 episode, 1976)
Command Center Operative (uncredited) (1 episode, 1976)
Main Mission Operative (uncredited) (1 episode, 1976)
Technician (uncredited) (1 episode, 1976)
Patient (uncredited) (1 episode, 1976)
Guard (uncredited) (1 episode, 1976)
Female Botanist (uncredited) (1 episode, 1976)
Male Botanist (uncredited) (1 episode, 1976)
Alphan (uncredited) (1 episode, 1976)
Operative (uncredited) (1 episode, 1976)
Pilot (Corridor) (uncredited) (1 episode, 1976)
Guard (uncredited) (1 episode, 1977)
Alien Computer (uncredited) (1 episode, 1977)
Model (uncredited) (1 episode, 1977)
Security Guard (uncredited) (1 episode, 1977)
Phirly (uncredited) (1 episode, 1977)
Dorcon Soldier (uncredited) (1 episode, 1977)
Alphan (uncredited) (1 episode, 1977)