The Mind of Evil is the second serial of the eighth season of the British science fiction television series Doctor Who, which was first broadcast in six weekly parts on BBC1 from 30 January to 6 March 1971. In the serial, the alien time traveller the Master (Roger Delgado) is plotting to start World War III by destroying a peace conference between the United States and China in London by using a nerve gas missile he hijacked from the organisation UNIT.