1978

In 1978, the Fourth Doctor and Romana I searched for the third segment of the Key to Time on Earth, encountering the Ogri. (TV: The Stones of Blood)

Igrix intended to end poverty in 1978. (COMIC: The Love Invasion)

Dated events
On 21 February, workers in Mexico City uncovered the sacrificial stone at the base of the Great Temple. (PROSE: The Left-Handed Hummingbird)

On 25 February, Saeed Taufeeq was born. (TV: Adrift)

On 5 April, a memorial service was conducted for Charles Dickinson's son Justin, whom UNIT had claimed had died in the line of duty. (PROSE: Instruments of Darkness)

On 3 May, Dominic Martin was born. (AUDIO: Cuddlesome)

On 16 August, Gwen Cooper was born. (TV: Children of Earth)

Unknown dates
Chris Parsons graduated from Cambridge, and soon began his postgraduate studies at St Cedd's College. (HOMEVID: Shada)

The Doctor shipped the newly built K9 Mark III to Lavinia Smith's home in South Croydon as a gift for Sarah Jane Smith. However, the gift was not received by her until 18 December 1981. (TV: A Girl's Best Friend)

The Eighth Doctor brought Anji Kapoor and Fritter to a Hollywood bar, where they met special effects photographer Ron von Arnim and later Noël Coward. Coward arrived here from the 1960s using pinking shears given to him by Iris Wildthyme, which could cut through the fabric of space and time. (PROSE: Mad Dogs and Englishmen)

The Doctor met the Harlem Globetrotters, who taught him how to spin a basketball on his finger. (PROSE: Dark Horizons)

How I Saved the World by Alexander Lullington-Smythe, which was published by Aphrodite Press in 1976, was "very publicly discredited." (PROSE: Salvation)

According to one of Bill Potts' essays, many "modern" ideas on the cosmic far ultraviolet background began to emerge during the Pittsburgh Conference on BL Lac Objects. (TV: The Pilot)

Behind the scenes
At the beginning of Legacy, the Eleventh Doctor and Vastra arrive in Cardiff on 16th October 1978 to find Sontarans changing history by invading Earth. The Doctor and Vastra defeated the Sontarans, but realised that they had only witnessed the beginning of a Sontaran plot to alter all of time.

According to the UNIT website, the book Forces Other Than NATO: A history of Special Operations Units 1945-1989 contained an extensive section on UNIT's involvement in a crisis in Transylvania in this year.