The twelfth season of British science fiction television series Doctor Who began on 28 December 1974 with Tom Baker's first serial Robot, and ended with Revenge of the Cybermen on 10 May 1975.

Robot is the first serial of the 12th season in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 28 December 1974 to 18 January 1975. It was the first full serial to feature Tom Baker as the Fourth Doctor, as well as Ian Marter as new companion Harry Sullivan. The serial brought a full end to the Pertwee era, as it was the final story with the production team of Barry Letts and script editor Terrance Dicks. It was also the final regular appearance of UNIT, who had become regulars starting with the first Jon Pertwee serial Spearhead From Space.