Doctor Who: Mawdryn Undead backdrop

Doctor Who: Mawdryn Undead

Directed by Peter Moffatt

Starring Peter Davison, Sarah Sutton

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?