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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
Stephen Garlick
Ibbotson
Roger Hammond
Dr. Runciman
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Released
BBC
Peter Moffatt
Director
Peter Grimwade
Writer
Stephen Scott
Production Design
Godfrey Johnson
Camera Operator
