12 December

On 12 December 2360, the Eleventh Doctor and River Song visited Calderon Beta, where they encountered two future versions of River and one of the Doctor. (HOMEVID: First Night, Last Night)

On the same day in 1901, while on an expedition to the ruins of Babylon, time sensitive linguist John Lafayette stumbled across the Path to Babylon, circa 570 B.C.. (PROSE: Walking to Babylon)

Behind the scenes

 * 1938 - Actress Leslie Schofield was born.
 * 1949 - Actor Bill Nighy was born.
 * 1961 - Actress Sarah Sutton was born.
 * 1964 - "The End of Tomorrow" was first broadcast on BBC1.
 * 1989 - Actor Howard Lang died.
 * 1992 - Actress Gladys Spencer died.