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S20E09
Feb 1, 1983 · 25 min
6.6
Peter Davison
The Doctor
Janet Fielding
Tegan Jovanka
Mark Strickson
Vislor Turlough
Nicholas Courtney
Lethbridge-Stewart
Roger Hammond
Doctor Runciman
Stephen Garlick
Ibbotson
Angus MacKay
Headmaster
Valentine Dyall
Black Guardian
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