1983

In 1983, the Ice Warrior Skaldak was found frozen underneath the North Pole by a Soviet submarine. He awoke and threatened to launch a nuclear missile, allowing the superpowers to launch missiles at one another, ending humanity. He was stopped once an Ice Warrior ship rescued him. The Eleventh Doctor explained to Clara Oswald time was in flux; if Skaldak succeeded then history would change. (TV: Cold War)

In January, Nyssa and Tegan Jovanka spent several days on holiday in Amsterdam (AUDIO: The Elite) while the Fifth Doctor dealt with the renegade Time Lord Omega in the Sector of Forgotten Souls. (AUDIO: Omega, The Burning Prince)

On 9 June, in the United Kingdom general election, the ruling Conservative Party, led by the Prime Minister Margaret Thatcher, won a landslide victory over the Labour Party. (AUDIO: Rat Trap)

On 19 August, Ianto Jones was born. (TV: Fragments)

On 10 December, the Seventh Doctor, Bernice Summerfield, Roz Forrester and Chris Cwej arrived in Little Caldwell, England. Bernice Summerfield was reunited with her father Isaac Summerfield II. (PROSE: Return of the Living Dad)

On 24 December, Jason Kane was born. (PROSE: Return of the Living Dad)

Unknown dates
Alistair Gordon Lethbridge-Stewart, now retired from UNIT and working at Brendon Public School, met the Fifth Doctor, but had no recollection of the Doctor at all. In the ensuing adventure, the Brigadier met his younger self from 1977, causing his younger self to lose all memory of the Doctor and experience a nervous breakdown, while his 1983 self regained his memory. Vislor Turlough joined the Doctor on his travels at this time. Unknown to the Doctor, he did so under the orders of the Black Guardian. According to the Brigadier, Harry Sullivan was doing "hush-hush" work on behalf of NATO at this time, and Benton was selling used cars. (TV: Mawdryn Undead)

After the Fifth Doctor departed, the Brigadier reactivated his relationship with UNIT, (TV: The Five Doctors) eventually returning to active duty. (TV: Battlefield).

The Second Doctor and the Brigadier were abducted by Borusa while attending a UNIT reunion. (TV: The Five Doctors)

Ace burnt down Gabriel Chase. (TV: Ghost Light)

Henry Spencer, the publisher of James Stevens and one of his closest friends, died of complications due to AIDS, one of the first British men to die from the disease. (PROSE: Who Killed Kennedy)

The race horse Shergar was stolen from Ireland by and given to his ally Colonel Hugh Spindleton in Derbyshire in 1979 as a down payment on his services. Spindleton gave him the name "Pink Gin." (AUDIO: The Oseidon Adventure)

Craig Owens was born. (TV: The Lodger)

Joel Mintz was transported back in time from 1993 through a time rift created by Albinex. (PROSE: Return of the Living Dad)

Ronald Turvey was convicted of tax fraud. His Cuddlesome factory in Shoreham was closed down shortly afterwards. (AUDIO: Cuddlesome)

Sarah Jane Smith and K9 encountered the Silurians and the Sea Devils in Egypt. (COMIC: City of Devils)

The Fifth Doctor, Nyssa, Tegan and Turlough visited the University of Frodsham. Using a time machine that she had created, Dr. Philippa Stone accidentally sent her husband Professor John Bleak and Tegan to Mercia in 918 and transported Princess Ælfwynn to 1983. (AUDIO: The Lady of Mercia)

Jo Jones lived with the Nambikwara tribe in Mato Grosso, Brazil for six months. (TV: Death of the Doctor)

Sida was elected President of the Savages and the Elders' planet. (AUDIO: The Founding Fathers, The Locked Room)

On Verno in the 30th century, the Second Doctor used a 1983 power blast grenade that he found in the TARDIS armoury historic collection. (COMIC: Space War Two)

Alternative timeline
In an alternative timeline, the Galactic Dutch Company had created domed colonies on both Venus and Mars and possessed a fleet of 1,000 interstellar ships by 1983. (AUDIO: The Waters of Amsterdam)