1980

Events

Victoria Waterfield visits Det-sen Monastery in Tibet, believing she is following a summons from her father. (MA: Downtime).
Sarah Jane Smith claimed to Lawrence Scarman that she have come from the year 1980, though this is disputed. (DW: Pyramids of Mars; see UNIT dating controversy).
Dr. Owen Harper, Torchwood 3 operative, is born. (WEB:torchwood.co.uk)

8 - Former Beatle John Lennon is shot and killed by Mark David Chapman outside his home in New York City. (NA: The Left-Handed Hummingbird)
25 - Professor Edward Travers, CBE, dies. (MA: Downtime)

The Doctor brings Sarah Jane Smith and Laurence Scarman from 1911 and shows them what 1980 would look like if Sutekh had succeeded in freeing himself, a lifeless Earth orbiting a dead sun. This example of alternate time convinces Sarah that they must return to 1911 and stop Sutekh. (DW: Pyramids of Mars)

5 - DW:The Horns of Nimon Episode 3 first broadcast.
12 - DW:The Horns of Nimon Episode 4 first broadcast, bringing an end to the season six weeks earlier than planned due to the cancellation of Shada. Final episode to feature the original 1960s arrangement by Delia Derbyshire of the Doctor Who theme music, specifically the arrangement introduced in the 1967 serial The Macra Terror. Also final use of the diamond-shaped series logo and Bernard Lodge "tunnel" opening sequence.
24
- Publication of DWN:Doctor Who and the Underworld.
- American edition of DWN:Doctor Who and the Android Invasion is published by Pinnacle Books.

20 - Publication of DWN:Doctor Who and the Stones of Blood, in both the UK (published by Target) and the US (published by Pinnacle Books). This was the last US edition (with introduction by Harlan Ellison and editorial changes for American readers) to be published by Pinnacle.

26 - Publication of DWN:Doctor Who and the Armageddon Factor. Due to the inability of Target Books to come to an agreement with Douglas Adams, this would ultimately be the last of the Key to Time- arc serials to be novelised. The remaining serial, The Pirate Planet, would not be novelised.
Doctor Who Magazine begins publishing Doctor Who comic strips written by Alan Moore. This is some of his earliest work, long predating his rise to fame as the writer of Watchmen and League of Extraordinary Gentlemen.

6 - Barry Justice (King Charles IX in DW:The Massacre of St Bartholomew's Eve) dies in London.
21 - Publication of DWN:Doctor Who and the Keys of Marinus and DWN:Doctor Who and the Nightmare of Eden. First time in several years that Target Books released more than one book on the same day.
30 - DW:The Leisure Hive Episode 1 first broadcast, launching a longer-than-usual season that is Tom Baker's final season and the first series produced by John Nathan-Turner. Among the numerous changes evident with this episode is the introduction of a radically different arrangement of the Doctor Who Theme music by Peter Howell and a new neon-tubing style series logo.

4 - DW:Meglos Episode 2 first broadcast.
11 - DW:Meglos Episode 3 first broadcast.
16 - Publication of DWN:Doctor Who and the Horns of Nimon. Although the series branding has changed to a new logo, the 1973-1980 logo is still used by Target Books for several more volumes.
18 - DW:Meglos Episode 4 first broadcast.
25 - DW:Full Circle Episode 1 first broadcast.

1 - DW:Full Circle Episode 2 first broadcast.
8 - DW:Full Circle Episode 3 first broadcast.
13 - Junior Doctor Who and the Brain of Morbius First Published. This is a short version of Doctor Who and the Brain of Morbius aimed at younger readers and is one of two "Junior Doctor Who" books released in 1980. Reportedly the book was originally to have been released in 1978.
15 - DW:Full Circle Episode 4 first broadcast.
22 - DW:State of Decay Episode 1 first broadcast.
29 - DW:State of Decay Episode 2 first broadcast.

4 - Publication of DWN:Doctor Who and the Monster of Peladon.
6 - DW:State of Decay Episode 3 first broadcast.
8 - Former Beatle John Lennon, who appeared as himself in "The Chase," is shot and killed by Mark David Chapman outside his home in New York City.
13 - DW:State of Decay Episode 4 first broadcast.

Spring-summer: John Nathan-Turner takes over as executive producer for Doctor Who. Among the changes he implements is the introduction of a new arrangement for the show's theme song, an updated opening credit sequence, and the announcement that the 1980-81 season will be Tom Baker's last as the Doctor.
Junior Doctor Who and the Giant Robot, a short version of Doctor Who and the Giant Robot aimed at younger readers is published.
A series of four illustrated storybooks for children, The Adventures of K9 by David Martin, are published by Sparrow Books.
Tom Baker and Lalla Ward appear as The Doctor and Romana in a series of commercials for Australian television, advertising Prime Computers (an early home microcomputer). While most of the commmercials feature them in their standard character roles, the final commercial in the series has Romana flirting with the Doctor and ends with the Doctor proposing marriage to her!