Three interlinked stories from the Peter Davison era of Doctor Who, the Black Guardian Trilogy brings together Mawdryn Undead, Terminus and Enlightenment, as the Doctor finds himself under threat from an old foe.
The enemy in question, of course, is the Black Guardian of the title, who first appeared at the end of the Tom Baker Key To Time season. Across the three stories of the Black Guardian Trilogy, he
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