17 December (releases)


 * 1966 - Episode one of The Highlanders was first broadcast on BBC1.
 * 1966 - Part four of the TV Comic story The Experimenters was first published.
 * 1977 - Part four of The Sun Makers was first broadcast BBC1.
 * 1977 - Part five of the TV Comic story The Aqua-City was first published.
 * 1993 - UNIT Recruitment Film was first broadcast on BBC One, alongside a repeat airing of the final episode of Planet of the Daleks.
 * 2006 - Out of Time was first broadcast on BBC Three.
 * 2009 - The Doctor Who Adventures comic story A Merry Little Christmas was first published.
 * 2009 - Part five of the Torchwood Magazine comic story Broken was first published.
 * 2009 - Part one of The Doctor on My Shoulder was first published online.
 * 2010 - Parts three and four of Snowfall was first published online.
 * 2012 - Vastra Investigates: A Christmas Prequel was released online.
 * 2013 - Afterlife and Trial of the Valeyard were first released by Big Finish.
 * 2014 - The Rani Elite was first released by Big Finish.