The Doctor finds that the subterranean UK Habitat is run by a cloistered robot named Drathro, whom the inhabitants call "The Immortal." Their black light energy converters are destabilizing, unaware that it's the result of two space pirates mucking about on the surface with designs on looting their dwelling. Written by
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Tis my task to study the ancient texts.
About which you continually boast. That's the trouble with parried little swats like you, Balazar. You can't even organize an efficient stoning.
It was only half over.
You'd have been free of your troubles now if Merdeen and his trained guards had not saved you.