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Season 20 involved a plot where The Black Guardian frequently attmepted to kill the Doctor. This thread started in "Mawdryn Undead" and concluded in the serial " Enlightenment"- three episodes after.

In the Timey-Wimiest story of the whole classic era, Mawdryn Undead has the Fifth Doctor re-encountering Brigadier Lethbridge-Stewart in 1983, only to find his old friend a shell of his former self: a ...

Clips from Mawdryn Undead: Part 4 ...

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 ...