|See also:||crossover, SuperWho, WhoLock, SuperLock, SuperWhoAvengeLock, SuperWhoLockian|
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A "SuperWhoLockian" is an individual who is an avid fan of all three shows. These fans are notorious for their SuperWhoLock-themed Tumblr URLs, which are sometimes very long. (See the Superwholock url generator.)
There has been some backlash against the popularity of the crossover from other fans who feel that it took over the fandom tags for the individual shows.
Some fans believe that there are connections between the shows. 
The first Tumblr post available in the "superwholock" tag is from 10 August 2011. It is probable that other posts had been floating around before this time and either had not used the accepted tag, or have since been deleted (the August 10th post references an earlier post which has since been deleted by the original poster). The earliest work with the "Superwholock - Fandom" tag on AO3 was posted 22 August 2012, but the first work tagged with the three fandoms separately was posted 16 January 2012. The trend is harder to track on Fanfiction.net, which only allows crossover tags of two fandoms, but the first story with "superwholock" in the summary was posted on 3 January 2012.
SuperWhoLock was most popular between early 2013-mid 2014. Various reasons for the decline in the fandom's popularity have been proposed, as chronicled in the post I would pay top dollar for a comprehensive, source-supported explanation of how Superwholock vanished.
- SuperWhoLock gif set
- Demon Doctor, first posted 26 March 2012 by 221bgallifrey
- My Sherlock Secret Santa by hinsabbies (29 December 2012)
- brunette in trenchcoat and their blondie in jacket, gifset by lubenatic (4 August 2016)
- SuperWhoLock The Comic, first posted 11 January 2013, last updated 1 August 2016
- What are the odds of Superwholock actually happening? at TheDailyFandom.com
- WTF is SuperWhoLock?, an article about the phenomenon at The Daily Dot
- I would pay top dollar for a comprehensive, source-supported explanation of how Superwholock vanished. 2016 tumblr thread
- The Keys to SuperWhoLock on The Artifice
- Tumblr post Castiel in DW and Sherlock
- What would the portmanteau be for Supernatural/Doctor Who/Sherlock crossovers? by michaelandthegodsquad archived
- As of 31 August 2016 -- plenty of time for evidence to be removed
- The Detective, The Angel, The Alien & The Birthday Cake by HoneyYouShouldSeeMeInACrown
- Time Has Come Today by morelenmir
- The Consulting Chosen One by Teddicus Lupini
- SuperWhoLock on KnowYourMeme, including a Google trends graph
- archived, 17 notes as of 31 August 2016