Calificación
Reparto

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

Rex Robinson
Doctor Tyler

Roy Purcell
President of the Council

Laurie Webb
Mr. Ollis

Clyde Pollitt
Chancellor

Graham Leaman
Time Lord

Patricia Prior
Mrs. Ollis

Denys Palmer
Corporal Palmer