Attack of the Cybermen is the first serial of the 22nd season of the British science fiction television series Doctor Who, which was first broadcast in two weekly parts on 5 and 12 January 1985. It was written by pseudonymous author Paula Moore, who has conflicting accounts to whom this credit belongs. Beginning with this serial and continuing for the remainder of Season 22, episodes were 45 minutes in length (as opposed to previous episodes which were 25 minutes long); for syndication, in some markets, this serial is re-edited into four 25-minute segments.
The serial is set in London in 1985 and the planet Telos in the future. In the serial, the Cybermen plot to change the course of history by destroying Earth with Halleys Comet in 1985, which would prevent the destruction of the Cybermens original home planet Mondas. In addition to its contemporary London setting, it also features several other references to the previous seasons Resurrection of the Daleks, notably the return of Lytton (played by Maurice Colbourne) and his henchmen (who again masquerade as policemen), and is directed by Matthew Robinson in his second and final contribution to the series.