Directed by
Starring
Barry Morse
Prof. Victor Bergman
24 episodes, 1975-1976
Roy Marsden
Alien Invisible
/ ...
2 episodes, 1976-1977
Marc Zuber
Main Mission Operative
/ ...
2 episodes, 1975-1976
Quentin Pierre
Security Guard
/ ...
(uncredited)
32 episodes, 1975-1977
Tony Allyn
Security Guard
(uncredited)
20 episodes, 1975-1976
Alan Harris
Main Mission Operative
/ ...
(uncredited)
16 episodes, 1975-1977
Pam Rose
Command Center Operative
/ ...
(uncredited)
8 episodes, 1976
Maxwell Craig
Security Guard
/ ...
(uncredited)
7 episodes, 1975-1977
Barbara Kelly
Computer Voice
/ ...
(uncredited)
7 episodes, 1975-1976
Emily Bolton
Operative June
(uncredited)
5 episodes, 1975-1976
James Fagan
Ken Johnson
/ ...
(uncredited)
5 episodes, 1975-1976
Chai Lee
Main Mission Operative
/ ...
(uncredited)
5 episodes, 1975-1976
Paul Weston
Main Mission Operative
/ ...
(uncredited)
4 episodes, 1975-1977
Ann Maj-Brit
Main Mission Operative
/ ...
(uncredited)
4 episodes, 1975-1976
Peter Brayham
Security Guard
/ ...
(uncredited)
4 episodes, 1976-1977
Roy Scammell
Space Animal
/ ...
(uncredited)
3 episodes, 1975-1977
Jan Rennison
Main Mission Operative
/ ...
(uncredited)
3 episodes, 1975-1976
Vic Armstrong
Main Mission Operative
/ ...
(uncredited)
2 episodes, 1975-1976
Linda Hooks
Alien Girl
/ ...
(uncredited)
2 episodes, 1975-1976
Eddie Stacey
Clansman
/ ...
(uncredited)
2 episodes, 1975-1976
Felicity York
Alphan in corridor #2
/ ...
(uncredited)
2 episodes, 1976-1977
Del Baker
Dorcon Soldier
/ ...
(uncredited)
2 episodes, 1977
Lea Brodie
Hilary Preston
(uncredited)
1 episode, 1975
Don Fellows
GTV Newscaster
(uncredited)
1 episode, 1975
Jan Harvey
Alpha News Service Girl
(uncredited)
1 episode, 1975
David Robb
Main Mission Operative
(uncredited)
1 episode, 1975
Norma West
Main Mission Operative
(uncredited)
1 episode, 1975
Romo Gorrara
Running Technician
(uncredited)
1 episode, 1976
Nick Hobbs
Security Guard
(uncredited)
2 episodes, 1976-1977
Claire Lutter
Main Mission Operative
(uncredited)
1 episode, 1976
Frank Maher
Decontamination Operative
(uncredited)
1 episode, 1976
Roy Stewart
Tall Alien in Cave
(uncredited)
1 episode, 1976
Marc Smith
Alien Computer
(uncredited)
1 episode, 1977
Written by