On screen
Cast
32 credited performers
Jon Pertwee
The Doctor
Caroline John
Liz Shaw
Nicholas Courtney
Brigadier Lethbridge-Stewart
Ronald Allen
Ralph Cornish
John Abineri
Carrington
Artwork unavailable
Robert Cawdron
Taltalian
Michael Wisher
John Wakefield
Artwork unavailable
Cheryl Molineaux
Miss Rutherford
Artwork unavailable
Ray Armstrong
Grey
Artwork unavailable
Robert Robertson
Collinson
Artwork unavailable
Ric Felgate
Van Lyden / Alien Ambassador
Artwork unavailable
Dallas Cavell
Quinlan
Artwork unavailable
Bernard Martin
Control Room Assistant
John Moreno
Dobson
Artwork unavailable
James Haswell
Corporal Champion
Artwork unavailable
Derek Ware
UNIT Sergeant
William Dysart
Reegan
Cyril Shaps
Lennox
Gordon Sterne
Heldorf
Artwork unavailable
Steve Peters
Alien Ambassador / Lefee
Artwork unavailable
Neville Simons
Alien Ambassador / Michaels
Max Faulkner
UNIT Soldier
Artwork unavailable
John Lord
Masters
Artwork unavailable
Tony Harwood
Flynn
John Levene
Sergeant Benton
Artwork unavailable
James Clayton
Private Parker
Artwork unavailable
Joanna Ross
Control Room Assistant
Artwork unavailable
Carl Conway
Control Room Assistant
Roy Scammell
Technician
Artwork unavailable
Peter Noel Cook
Alien Space Captain
Peter Halliday
Aliens' Voices
Geoffrey Beevers
Private Johnson