31 January (releases)


 * 1970 - Episode one of Doctor Who and the Silurians was first broadcast on BBC1.
 * 1976 - Part one of The Seeds of Doom was first broadcast on BBC1.
 * 1976 - Part one of TV Comic story Virus was first released in issue 1259.
 * 1981 - Part one of The Keeper of Traken was first broadcast on BBC1.
 * 2009 - Big Finish audio story The Transit of Venus was first released.
 * 2011 - DVD box set K9: Series 1: Volume 1, containing Regeneration, Liberation, The Korven, The Bounty Hunter, Sirens of Ceres, Fear Itself, The Fall of the House of Gryffen, Jaws of Orthrus, Dream-Eaters, Curse of Anubis, Oroborus and Alien Avatar, was released in Region 2.