The twenty-fifth season of British science fiction television series Doctor Who began on 5 October 1988. It comprised four separate serials, beginning with Remembrance of the Daleks and ending with The Greatest Show in the Galaxy. To mark the 25th anniversary season, producer John Nathan-Turner brought back the Daleks and the Cybermen. The American New Jersey Network also made a special behind-the-scenes documentary called The Making of Doctor Who, which followed the production of the 25th anniversary story Silver Nemesis. Andrew Cartmel script edited the series.

Season 25 saw script editor Andrew Cartmel, who had joined for the previous season, exert a greater influence on the style of the series. He had watched serials from the Philip Hinchcliffe and Robert Holmes era such as The Seeds of Doom and The Talons of Weng-Chiang in preparation for it and concluded that the series should return to a more serious and dramatic approach.^[1] The season also saw the start of a move to explore the Doctor's past; Cartmel had felt that as more of the character's own history, together with the history of the Time Lords, had been revealed, some of the mystery about the Doctor had been lost. As a consequence, together with new writers Ben Aaronovitch and Marc Platt, he began developing the seeds of a new backstory, which would be hinted at throughout the season, that suggested the Doctor to be more powerful than most people were aware of.^[2] This concept eventually came to be known as the "Cartmel Masterplan".

The Cartmel Masterplan is a fan name for the planned Doctor Who backstory developed primarily by script editor Andrew Cartmel and writers Ben Aaronovitch and Marc Platt, by which they intended to restore some of the mystery of the Doctor's background that had been lost through revelation of the existing backstory.^[3] Although hints were dropped in the last two seasons, the proposed revelations never materialised on screen as the programme was not renewed into the 1990s.

Some of the stories during the Seventh Doctor's tenure were intended to deal with the lack of mystery by suggesting that much of what was believed about the Doctor was wrong and that he was a far more powerful and mysterious figure than previously thought. In an untelevised scene in Remembrance of the Daleks (1988), the Doctor stated that he was "far more than just another Time Lord." In Silver Nemesis (1988), lines about the creation of validium and Lady Peinforte knowing the Doctor's secrets were meant to point towards this mystery.^[4]

In 2014, Cartmel speculated that the "great secret" Lady Peinforte knew about the Doctor in Silver Nemesis was "perhaps" connected to his name, which during the siege on the Fields of Trenzalore in "The Time of the Doctor" (2013) is said to be what would allow the Time Lords to return to the universe.^[5]

The Other was first mentioned explicitly in the novelisation of Remembrance of the Daleks (1990) by Ben Aaronovitch as a shadowy figure in Time Lord history, one of the founding Triumvirate of Time Lord society after the overthrow of the cult of the Pythia that had, until then, dominated Gallifrey.^[6] The other two members of the Triumvirate were Rassilon and Omega.

This season was broadcast on Wednesdays.

The entire season was broadcast from 5 October 1988 to 4 January 1989. Transmission moved to Wednesday nights. Season twenty-five was originally to have been broadcast in production order, with The Greatest Show in the Galaxy second. However, the expected start of the season on 7 September was postponed to 5 October as a result of BBC coverage of the Seoul Summer Olympics. Nathan-Turner still wanted to lead off the year with Remembrance of the Daleks and have episode one of the twenty-fifth anniversary story, Silver Nemesis, broadcast on 23 November – the actual date of Doctor Who's 25th anniversary. This left only three weeks in between the two serials. Consequently, the original season finale, The Happiness Patrol, was exchanged with The Greatest Show in the Galaxy.