31 January (releases)


 * 1970 - Episode one of Doctor Who and the Silurians was first broadcast on BBC1.
 * 1970 - Part three of the TV Comic story The Arkwood Experiments was first published.
 * 1976 - Part one of The Seeds of Doom was first broadcast on BBC1.
 * 1976 - Part one of the TV Comic story Virus was first published.
 * 1981 - Part one of The Keeper of Traken was first broadcast on BBC1.
 * 2003 - Rip Tide was first published by Telos Publishing.
 * 2007 - Part one of the Doctor Who Adventures comic story 13 O'Clock was first published.
 * 2008 - Part two of the Doctor Who Adventures comic story Hot Metal was first published.
 * 2008 - Step Back in Time aired on BBC Three.
 * 2009 - The Big Finish audio story The Transit of Venus was first released.
 * 2011 - The DVD box set K9: Series 1: Volume 1 was released in Region 2.
 * 2011 - The Mutants was released on Region 2 DVD.
 * 2013 - The Doctor Who Adventures comic story Pet Panic was first published.
 * 2017 - The World Beyond the Trees was first released by Big Finish Productions.