Ok,title cold use work,but could not use one that would give the idea totally away. If you can handle my rambling for little bit,I have had a nagging plot bothering me for a time.
What if time was a living entity,like the T.A.R.D.I.S,and what is all this time,she has been watching the timelines,and fixing small hiccups that might have happened during certain events. She has made her present known to the doctor once,as Time is an Eternal,that was assigned to earth.
But something has gone totally wrong,and Time is literally dying,and timelines that should never collide are. But that is where I am snagged. Should it be the Eternal known as Death causing Time her agony and she needs a new champion to fight him,and his champion.
This has been in my head since I was rereading different reincarnation of the Doctor's back story and The Seventh was Time's Champion while The Master was Death's champion.