Doom For The Doctor

Doom For The Doctor is the eleventh and final episode of the tenth series of Doctor Who, and marks the final appearance of Christina as a main companion. It is a continuation from In My Time of Dying.

Synopsis
"Time is being changed...." - Billy

Christina has died in the Doctor's place, but he is determined to set what has been made back to the way it was, he knows he must die. But as the enemy closes in on the Doctor, an old friend gives the Doctor some haunting words.