2020

Unknown dates

 * The Silurians emerged from their underground city around Cwmtaff and captured local mammals, including humans. (DW: The Hungry Earth)
 * The Eleventh Doctor, his companions, and human allies discovered the Silurians. (DW: 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. (DW: Cold Blood)
 * Contemporaneous versions of Amy and Rory Williams celebrated their tenth wedding anniversary and went back to Cwmtaff, Wales to see the 2010 versions of themselves with the Eleventh Doctor. (DW: The Hungry Earth)
 * The first lunar passenger module was developed by Daniel Eldred's father. (DW: The Seeds of Death)
 * The Seventh 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. (BFA: House of Blue Fire)
 * The British Army had a King's New Delta Squadron by this time, suggesting that Queen Elizabeth II had died. (BFA: Black and White) In any event, the United Kingdom was described as having a king by 24 May 2027. (BFA: A Death in the Family)

Alternative timelines

 * With Rory Williams dead and his existence erased, the 2020 version of Amy Pond visited Cwmtaff alone to wave to the Eleventh Doctor and herself. (DW: Cold Blood)

Behind the scenes

 * The trailer included on the Lost in Time boxed 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.