25 December

History of the Doctor Who Universe

 * Traditional date of Christmas Day.
 * 1642: Isaac Newton born.
 * 1869: The Ninth Doctor and Rose Tyler encounter Charles Dickens in Cardiff during the events of The Unquiet Dead.
 * 2006: The Tenth Doctor, Rose Tyler, and Mickey Smith stop an invasion of Earth by the Sycorax during the events of The Christmas Invasion.

History of Doctor Who

 * 1965 - The Feast of Steven First Broadcast (The Daleks' Master Plan Episode 7)
 * 2005 - The Christmas Invasion First Broadcast
 * 2006 - The Runaway Bride First Broadcast