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.
Caught in a warp ellipse, the TARDIS is drawn to a huge spacecraft orbiting Earth.
At Brendon School, the Doctor enlists the help of the Brigadier.
Mawdryn and his eternal mutants are awake and reveal the truth, they are exiles.
The Doctor's ethics are challenged, the two Brigadier's finally meet, Turlough plots with the Black Guardian.
Fifth Doctor
Peter Davison
Tegan Jovanka
Janet Fielding
Nyssa
Sarah Sutton
Alistair Gordon Lethbridge-Stewart
Nicholas Courtney
Black Guardian
Valentine Dyall
Vislor Turlough
Mark Strickson
Headmaster
Angus MacKay
Ibbotson
Stephen Garlick
Doctor Runciman
Roger Hammond
Matron
Sheila Gill
Mawdryn
David Collings
1st Mutant
Peter Walmsley
2nd Mutant
Brian Darnley
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