Doctor Who: Lockdown!

Doctor Who: Lockdown! (also styled Doctor Who: LOCKDOWN!, and originally titled Who at Home ) was a project founded by Emily Cook from Doctor Who Magazine who proposed the idea to Doctor Who fans as a simulcast watch-along of the show's 50th Anniversary, The Day of the Doctor, worldwide as a way to pass the time in self-isolation due to worldwide outbreak of COVID-19. The story was shown on 21 March 2020. She added that if the concept gained enough popularity, she would arrange more watch-alongs.

For the first watch-along, Steven Moffat penned a short introductory skit, Strax Saves the Day, which was released on Twitter. The home-produced video starred Dan Starkey as Strax, represented on screen with a stuffed toy of the character, and featured the voice of Neve McIntosh as Vastra.

For the second watch-along Russell T Davies released a previously withheld prequel short story, Doctor Who and the Time War, which was released onto the Doctor Who website and depicted an alternate account to the Eighth Doctor's involvement in the Last Great Time War and the Ninth Doctor's origins, and a sequel audio story, Revenge of the Nestene, which was released onto YouTube and depicted the aftermath of the Nestene Consciousness's defeat at the hand of the Ninth Doctor.

Such releases continued with each new watchalong, bringing together established DWU writers, actors and/or characters in a variety of new original content, released alongside each instalment of this event.

Doctor Who: Lockdown! was only the hub of several varyingly-official watchalong projects on Twitter at the time. A The Five Doctors watchalong (with the hashtag #GameofRassilon) organised by Ellie Collins ("TardisMonkey") was promoted by Emily Cook but was not directly part of the Lockdown! line, and also saw a small scene with Paul Jerricho as the Castellan being filmed and released for the event. Other watchalongs promoted by Emily Cook included The Three Doctors, organised by Ellie Collins, (which had two short spoofs starring Jon Culshaw and Katy Manning), The Tomb of the Cybermen, organised by "BiblicalComix", and The War Games, organised by Pip Madeley. Radio Times organised Torchwood simulcasts with John Barrowman tweeting along and Billie-Adora ("Transgirlbillie") organised watchalongs of Class. Big Finish organised a livestream of The Chimes of Midnight (with the hashtag #PlumPudding) with Paul McGann tweeting along. Nor were the tweetalongs the only occasion for the release of new webcast Doctor Who content, with Russell T Davies or even the BBC itself releasing new webcasts not connected with a particular watchalong in an effort to spread awareness of various facets of the crisis.

Associated releases
Several new short stories and webcasts were released to tie into the watchalongs, or the COVID-19 pandemic in general, some of them on a dedicated Doctor Who: Lockdown YouTube channel.