The Creature from the Pit is the third serial of the 17th season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 27 October to 17 November 1979. It was the first serial to feature David Brierley as the voice of K9. On the planet Chloris, Lady Adrasta (Myra Frances) imprisons the Tythonian ambassador Erato in a pit for fifteen years in order to maintain her control over the planet's limited metal supply. The alien time traveller the Fourth Doctor (Tom Baker) attempts to negotiate peace and a trade agreement with Erato.