The Year That Never Was

The Year that Never Happened was a year which, never occured, but was in the memories of many people who witnessed it. It was set betweeen April 2008 and 2009, and was when the Time Lord Empire was being created on Earth by the Master.

However, thanks to the Doctor, Martha Jones and Jack Harkness, the paradox machine used to subvert a temporal paradox thereby allowing the year to occur was destroyed, and so the events of the year did not actually happen. The only people with memories of the year were the Doctor, the Master, Jack Harkness and the Jones family on board the Valiant. (DW: Last of the Time Lords)