Cast

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

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Angus MacKay

Headmaster

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Stephen Garlick

Ibbotson

Roger Hammond

Dr. Runciman

Crew

Peter Moffatt

Director (Directing)

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Peter Grimwade

Writer (Writing)