Sinopsis
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Galería
Reparto
Peter Davison
The Doctor
Sarah Sutton
Nyssa
Janet Fielding
Tegan Jovanka
Mark Strickson
Vislor Turlough
Nicholas Courtney
Brigadier Alistair Gordon Lethbridge-Stewart
Valentine Dyall
The Black Guardian
David Collings
Mawdryn
Angus MacKay
Headmaster
S
Stephen Garlick
Ibbotson
Roger Hammond
Dr. Runciman
