On screen
Cast
14 credited performers
Jon Pertwee
The Doctor
Patrick Troughton
The Doctor
William Hartnell
The Doctor
Katy Manning
Jo Grant
Nicholas Courtney
Brigadier Lethbridge-Stewart
John Levene
Sergeant Benton
Stephen Thorne
Omega
Artwork unavailable
Rex Robinson
Doctor Tyler
Roy Purcell
President of the Council
Artwork unavailable
Laurie Webb
Mr. Ollis
Artwork unavailable
Clyde Pollitt
Chancellor
Artwork unavailable
Graham Leaman
Time Lord
Artwork unavailable
Patricia Prior
Mrs. Ollis
Artwork unavailable
Denys Palmer
Corporal Palmer