1970

In 1970, a part-Time Lord/part-human girl regenerated into an incarnation who was later known as Mels, initially emerging as "a toddler in the middle of New York." (TV: Day of the Moon, TV: A Good Man Goes to War, Let's Kill Hitler)

Dated events
In the summer of 1970 the Tenth Doctor and Rose Tyler visited Durham University, where they caused Frank Openshaw to meet his future wife Sandra. (PROSE: I Am a Dalek)

On 20 July, according to one account, the first human astronauts landed on the Moon, where they encountered the First Doctor, John and Gillian. (COMIC: Moon Landing)

On 20 August, Dorothy Gale McShane, later to be a companion of the Seventh Doctor known as "Ace", was born to Audrey Dudman in England. (TV: Ghost Light)

Mars Probe 7 reached Earth, the radioactive aliens were removed and the Third Doctor prevented General George Carrington from starting a war. (TV: The Ambassadors of Death, PROSE: Who Killed Kennedy)

Unknown dates
"Mary" killed Myra Bennett to consume her heart. Human authorities didn't catch her. (TV: Greeks Bearing Gifts)

Agatha Ellis was born in Hove. Her mother died in childbirth which caused her father to suffer a mental illness. (PROSE: Curtain Call)

The Second Doctor and Jamie McCrimmon encountered the Ice Apes in Antarctica. (COMIC: Ice Cap Terror)

Trey Korte was born in Chicago. (PROSE: Instruments of Darkness)

The Second Doctor, John and Gillian fought the Cybermen in London. (COMIC: Cyber-Mole)

New York City's total population was 7,824,756, 1,437,023 of whom were foreign-born. (TV: The Gathering)

Emeritus Professor Dame Hilda Hutchens won the Nobel Prize for Philosophy. (PROSE: Island of Death)

A new house at 39 Bannerman Road was constructed, replacing the previous house which was demolished in 1969. (AUDIO: The Ghost House)

Charles de Gaulle died. (PROSE: Who Killed Kennedy)

The Eleventh Doctor encountered the Morphuse in Detroit. (COMIC: Bite of the Morphuse!)

Alternate timeline
In an alternate timeline, the Beatles did not break up in 1970. The Eighth Doctor's companion Fitz Kreiner saw them perform at Live Aid in 1985. (PROSE: The Gallifrey Chronicles)