

A warp ellipse draws the TARDIS off course. The Fifth Doctor's companions are separated from him not in space, but in time, and he has to deal with a treacherous schoolboy named Turlough. But why does the Doctor's old friend, the Brigadier, not remember him at all?
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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

Angus MacKay
Headmaster
Stephen Garlick
Ibbotson

Roger Hammond
Dr. Runciman
Sheila Gill
Matron
Peter Walmsley
Mutant
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