Nicholas Courtney
Brigadier Lethbridge-Stewart
Ronald Allen
Ralph Cornish
Michael Wisher
John Wakefield
Cheryl Molineaux
Miss Rutherford
Robert Robertson
Collinson
Ric Felgate
Van Lyden / Alien Ambassador
Bernard Martin
Control Room Assistant
James Haswell
Corporal Champion
Steve Peters
Alien Ambassador / Lefee
Neville Simons
Alien Ambassador / Michaels
John Levene
Sergeant Benton
James Clayton
Private Parker
Joanna Ross
Control Room Assistant
Carl Conway
Control Room Assistant
Peter Noel Cook
Alien Space Captain
Peter Halliday
Aliens' Voices
Geoffrey Beevers
Private Johnson
