2020

In 2020, the Earth went into a lockdown due to COVID-19, a deadly virus that was going around. (PROSE: The Invasion of London, Sweet Revenge)

According to some accounts, Amy Pond and Rory Williams were still living on Earth by this year. (TV: The Hungry Earth, Cold Blood) Other sources indicate the Ponds had left their native era over half a decade before 2020. (TV: The Power of Three, The Day of the Doctor, COMIC: The Fractures) According to the Eleventh Doctor, the population of Earth was six billion. (TV: The Hungry Earth)

According to one account, Queen Elizabeth II had died and the British Army had a King's New Delta Squadron by 2020. (AUDIO: Black and White)

Around 2020, bowlboards with a curved layout replaced the 20th century QWERTY keyboard and lasted into the 23rd century. (PROSE: Dreamstone Moon)

Dated events
In March, River Song and Leela visited the village Charm on Ozkozania to see the outcome of rescuing Juda and Hema from the Royal Magnificat in 2019. Seeing Charm devastated by the Ozkozania Civil War, River and Leela went back in time to save Juda and Hema from Charm's destruction. (AUDIO: Emancipation)

On 17 July, Honoré Lechasseur and Emily Blandish time channeled to Kyoto and began investigating a series of deadly incidents orchestrated by the White Claw Kitsune. (PROSE: Kitsune)

On 31 December, the European Space Agency's Mars rover Leonardo discovered a copy of David Bowie's Life on Mars which had been left on the planet by Erimem and Andy Hansen in 2016. Most of the rover's mission control had been celebrating New Year's Eve at the time, and only John Wilcox witnessed the find. Assuming it to be a prank by his colleagues, Wilcox did not record the rover's encounter with the album. (PROSE: Life on Mars on Mars)

Team TARDIS
Early in the year, the Kasaavin invaded Earth with the assistance of, having planned as early as 1834, and Daniel Barton, CEO of VOR. In the week leading up to the invasion, the Kasaavin, realising that Earth's intelligence services had began to notice their presence, assassinated numerous intelligence officers across the planet (including C, the head of MI6), but not before he alerted the Thirteenth Doctor and Team TARDIS to the situation. Finding the Master disguised as O, an MI6 agent, Team TARDIS became wanted fugitives while the Doctor was displaced by the Kasaavin. However, the Doctor took the Master's TARDIS to the middle of 2019 and sabotaged the Silver Lady vital to the invasion. When the invasion came, the Doctor, accompanied by Ada Lovelace and Noor Inayat Khan, reunited with Team TARDIS and confronted the Master, who had been stranded on Earth for the past 77 years. While Barton publicly announced his intention to convert the majority of humanity into hard drives at the cost of their lives, the Doctor exposed the Master's intent to betray both Barton and the Kasaavin, resulting in him being taken by the Kasaavin as she exiled them to their own dimension. (TV: Spyfall)

The Judoon briefly placed Gloucester on lockdown while pursuing Ruth and Lee Clayton on behalf of the Gallifreyans. Ruth, ostensibly a 44 year old human woman who had lived in Gloucester since mid-December 1999, was actually a persona adopted by an incarnation of the Doctor using a Chameleon Arch. Having intercepted the Judoon's transmissions, the Thirteenth Doctor and Team TARDIS stumbled upon this incident which led to her meeting her other self, an apparent past incarnation who she had no memory of. Ultimately, the Doctor was able to elude the Judoon and the Gallifreyans before taking her leave, after which the Thirteenth Doctor picked up alerts across three continents on Earth. (TV: Fugitive of the Judoon)

In 1816, the Doctor offered to return her companions to 2020 as she proceeded to face the Cybermen in the far future. Though they declined and accompanied her, (TV: The Haunting of Villa Diodati) the Doctor, in the face of the CyberMasters on Gallifrey, ultimately had a TARDIS return them along with future residents Ravio, Ethan and Yedlarmi, who were to settle in the 21st century. (TV: The Timeless Children)

Other events
In 2020, a decade after Bernice Summerfield and Jason Kane's wedding, Emily Hutchings' The Unformed Heart was published. (PROSE: Happy Endings)

The Silurians emerged from their underground city around Cwmtaff and captured local mammals, including humans. The Eleventh Doctor and his companions Amy Pond and Rory Williams, and human allies discovered the Silurians. (TV: The Hungry Earth) Rory was killed by Restac, military leader of this group of Silurians, and absorbed by a time crack. The Silurians then went into hibernation for a millennium. (TV: Cold Blood)

Amy and Rory celebrated their tenth wedding anniversary and went back to Cwmtaff, Wales to see the 2010 versions of themselves with the Eleventh Doctor. (TV: The Hungry Earth)

The first lunar passenger module was developed by Daniel Eldred's father. (TV: The Seeds of Death)

Directly after meeting Nostradamus on Prophecy, the Seventh Doctor was alerted by his TARDIS to investigate the Blue Fire Project in 2020. (AUDIO: Black and White) The Doctor and Private Sally Morgan of the King's New Delta Squadron of the British Army defeated the Mi'en Kalarash, a being which fed on nightmares and one of the Elder Gods. Sally subsequently joined the Doctor as one of his companions. (AUDIO: House of Blue Fire)

There were riots in Liverpool. (AUDIO: Afterlife)

According to Hob's Death's Head Interactive Archive, the Fantastic Four sent Death's Head to the year 2020, (COMIC: Clobberin' Time!) where he came into conflict with mercenary Arno Stark, also known as Iron Man. (COMIC: The Cast Iron Contract)

A presidential election was due in the United States this year. In 2018, Jack Robertson planned to run against Donald Trump in this election. (TV: Arachnids in the UK)

When Charley Pollard examined the belongings of the 108th or 109th century time traveller Carmen, she found a 2020 reprinting of a book first published in 2018. (AUDIO: The Raincloud Man)

Alternate timelines
With Rory Williams dead and his existence erased, Amy Pond visited Cwmtaff alone to wave to herself. (TV: Cold Blood)

Behind the scenes
The trailer included on the Lost in Time box set and press material from the time around the production of The Power of the Daleks states that The Power of the Daleks occurred in this year.