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"The Time Lords abandoned us. Perpetual torment and despair. But the ending will come soon. I, Mawdryn, shall be a Time Lord"
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The Black Guardian recruits a young man named Turlough to assassinate the Doctor. Although outwardly an ordinary pupil at a boys' private boarding school, Turlough is in fact an alien who believes that the Guardian will return him home if he succeeds.
The Doctor: Peter Davison
Nyssa: Sarah Sutton
Tegan Jovanka: Janet Fielding
Vislor Turlough: Mark Strickson
Brigadier Alistair Lethbridge-Stewart: Nicholas Courtney
The Black Guardian: Valentine Dyall
Headmaster Mr. Sellick: Angus MacKay
Ibbotson: Stephen Garlick
Mawdryn: David Collings
Producer: John Nathan-Turner
Director: Peter Moffatt
Scriptwriter: Peter Grimwade