1981

Dates Unknown

 * Anne Travers becomes the cabinet's scientific advisor. (MA: Downtime)

February

 * 28 - The Fourth Doctor and Adric land the TARDIS by the side of a motorway to gain measurements of a police box. Air hostess Tegan Jovanka stumbles aboard the TARDIS on her way to work at London's Heathrow Airport. (Events of (parts of) DW: Logopolis)
 * 28 - The Fifth Doctor tries to return Tegan Jovanka to her own time, but instead the TARDIS lands on Monarch's ship. (DW: Four to Doomsday)

March

 * 1 - Following a lethal fall from the Pharos Project's dish, the Fourth Doctor regenerates. (DW: Logopolis) The regenerated Doctor and his companions manage to escape. (DW: Castrovalva)

June

 * Peter Tracey was given a suspended sentence for breaking and entering. (KAC: A Girl's Best Friend)

September

 * A hailstorm strikes Moreton Harwood. It lasts only thirteen seconds, but destroys Commander Bill Pollock's crops. (KAC: A Girl's Best Friend)

December

 * 1 - 14 - Sarah Jane Smith was out of the country working for Reuters. (KAC: A Girl's Best Friend)


 * 6 - Lavinia Smith departed Moreton Harwood for a lecture tour in America. Before departing, she arranges for a mysterious crate addressed to her niece, Sarah Jane Smith, to be left at Moreton Harwood. (KAC: A Girl's Best Friend)


 * 10 - Lavinia Smith phones Brendan Richards to tell him he will be spending Christmas with Sarah Jane. Brendan waits for Sarah to pick him up at school, unaware that she was out of the country. (KAC: A Girl's Best Friend)


 * 18 - 22 - Sarah Jane Smith opened the crate left by Lavinia and activated K9 Mark III, who had been waiting for her since 1978. (KAC: A Girl's Best Friend)


 * 29 - Members of the Hecate Cult at Moreton Harwood were tried for attempted murder. (KAC: A Girl's Best Friend)

January

 * 2 - Victor Carin (Virgil Earp in DW: The Gunfighters) died from cancer in Edinburgh, Scotland.
 * 3 - DW: Warriors' Gate Part 1 was first broadcast.
 * 5 - The Hitchhiker's Guide to the Galaxy debuts on BBC Television. A mini-series adaptation of Douglas Adams' radio play and novelisation, the series would include a cameo appearance by future Doctor Peter Davison as "The Dish of the Day".
 * 10 - DW: Warriors' Gate Part 2 was first broadcast.
 * 15 - DWN: Doctor Who and the Creature from the Pit was first published. Beginning with this release and continuing through 1991, Target Books will begin commissioning the original teleplay authors to adapt their own scripts, whenever possible.
 * 17 - DW: Warriors' Gate Part 3 was first broadcast.
 * 24 - DW: Warriors' Gate Part 4 was first broadcast. Lalla Ward departed the series with part 4 of this story. Also final appearance of K9 Mark II. Part 4 concludes the "E-Space Trilogy".
 * 28 - Production of DW: Logopolis concludes, bringing an end to the Tom Baker era.
 * 31 - DW: The Keeper of Traken Part 1 was first broadcast. Sarah Sutton debuted as new companion Nyssa (although she officially does not become a companion until the next story), and Anthony Ainley makes his first appearance on the series, though not yet as the Master.

February

 * The pop band The Human League releases the instrumental "Tom Baker" (in honour of the actor) on the flipside of their single "Boys and Girls". This piece of music was later reused for the Project Who radio series in 2005.
 * 7 - DW: The Keeper of Traken Part 2 was first broadcast.
 * 14 - DW: The Keeper of Traken Part 3 was first broadcast.
 * 21 - DW: The Keeper of Traken Part 4 was first broadcast. Anthony Ainley became the newest, and longest-serving, incarnation of The Master.
 * Doctor Who theme composer Ron Grainer died.
 * 28 - DW: Logopolis Part 1 was first broadcast. Janet Fielding debuts as new companion Tegan Jovanka.

March

 * 7 - DW: Logopolis Part 2 was first broadcast.
 * 14 - DW: Logopolis Part 3 was first broadcast. Sarah Sutton returned as Nyssa and officially becomes a companion.
 * 21 - DW: Logopolis Part 4 was first broadcast, concluding Season 18 and ending with Tom Baker's regeneration into Peter Davison. For the last time until 2005, the lead actor of the series was credited on screen as "Doctor Who" (beginning with the next season, the credit becomes "The Doctor").
 * 28 - Gareth David-Lloyd, who played Ianto Jones in Torchwood, was born in Newport, Wales.

April

 * John Nathan-Turner wrote a story outline for the proposed K9 and Company spin-off pilot story.
 * 13 - Studio taping begins on DW: Four to Doomsday, the first story of the Peter Davison era to be made, though it was not the first to be broadcast.
 * 17 - DWN: Doctor Who and the Enemy of the World was first published. Written by series actor Ian Marter, the book was controversial at the time of release for its use of adult language in a line of books officially considered children's literature. This was the last novelisation in the Target Books line to use the "diamond logo".

May

 * John Nathan-Turner and Anthony Root composed a "format document" for a planned spin-off series to be entitled K9 and Company.
 * 12 - Elisabeth Sladen was officially invited to reprise the role of Sarah Jane Smith for the planned K9 and Company spin-off.
 * 21 - REF: The Doctor Who Programme Guide Volumes 1 and 2, were first published in hardcover.

August

 * Doctor Who Annual 1982 was published.

October

 * 15 - DWN: Doctor Who and An Unearthly Child, an adaptation of the very first Doctor Who serial, was first published. Its publication promotes the upcoming rebroadcast of the serial by BBC Two as part of their "Five Faces of Doctor Who" special series re-broadcasts. The Target Books line switches to the then-current "neon tubing" series logo with this release.
 * Paperback editions of REF: The Doctor Who Programme Guide Volumes 1 and 2 was published. The books had been revised from the hardback versions.

November

 * Production of the pilot Part of the planned K9 and Company spin-off series, KAC: A Girl's Best Friend, takes place this month.
 * 2 - "The Five Faces of Doctor Who" special re-broadcast series commences with the third television broadcast of the first Part of DW: An Unearthly Child, the very first Part of Doctor Who. It airs in the UK on BBC Two.
 * 3 - Second television Broadcast of "The Cave of Skulls" (the second Part of DW: An Unearthly Child) in the UK on BBC Two
 * 4 - Second television Broadcast of "The Forest of Fear" (the third Part of DW: An Unearthly Child in the UK on BBC Two.
 * 5 - Second television Broadcast of "The Firemaker", the fourth and last Part of DW: An Unearthly Child in the UK on BBC Two.

December

 * Publication of REF: The Doctor Who Quiz Book by Nigel Robinson.
 * 21 - The final new episode of Terry Nation's Blake's 7 aired on the BBC.
 * 28 - KAC: A Girl's Best Friend, a pilot Part for the proposed spin-off K9 and Company, was first broadcast. The pilot reintroduces Sarah Jane Smith and introduces K9 Mark III.

Unknown dates

 * Steven Scott (Kebble in DW: The Power of the Daleks) died.
 * Marvel Comics published Marvel Premiere issue 60, bringing to a close the first set of American Fourth Doctor comic strip reprints from Doctor Who Weekly. Another series, Doctor Who, followed in 1984.