The Doctor
Liz Shaw
Brigadier Lethbridge-Stewart
Ralph Cornish
Carrington
Taltalian
John Wakefield
Miss Rutherford
Grey
Collinson
Van Lyden / Alien Ambassador
Quinlan
Control Room Assistant
Dobson
Corporal Champion
UNIT Sergeant
Reegan
Lennox
Heldorf
Alien Ambassador / Lefee
Alien Ambassador / Michaels
UNIT Soldier
Masters
Flynn
Sergeant Benton
Private Parker
Control Room Assistant
Control Room Assistant
Technician
Alien Space Captain
Aliens' Voices
Private Johnson