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