The Green Death is the fifth and final serial of the tenth season of the British science fiction television series Doctor Who, which was first broadcast in six weekly parts on BBC1 from 19 May to 23 June 1973. It was the last regular appearance of Katy Manning as companion Jo Grant. In the serial, the alien time traveller the Third Doctor (Jon Pertwee) and the organisation UNIT investigate a South Wales mine where waste from an oil plant has killed miners and made maggots grow to giant size.