Episode 4
S10 E4 January 20, 1973 0h 25m
★ 7.9
Source:
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Guest Stars
William Hartnell
The Doctor
Patrick Troughton
The Doctor
Nicholas Courtney
Lethbridge-Stewart
John Levene
Sergeant Benton
Rex Robinson
Dr. Tyler
Roy Purcell
President of the Council
Graham Leaman
Time Lord
Patricia Prior
Mrs. Ollis
