Set after "Last of the Time Lords" a eulogy from the Doctor to the Master.
You were a villain Master.
I won't deny it.
You were vengeful and spiteful. Angry and full of hate. You were capable of great evil.
For the longest time I let myself believe you were evil.
A villain by nature, down to your very core.
I was wrong.
I know that now.
I know that because somewhere, on a distant desolate planet at the end of the universe, where the skies are dark and the stars have died, there is a man.
A man who is building a ship he knows will never fly.
A man named Yana.
The fogwatch doesn't change you completely Master.
Not in the ways that truly count.
It changes your physiology, strips away your memories but it doesn't change your nature. It doesn't change your soul.
A century's long lifetime of anger, resentment, suffering and misery changed and twisted you beyond recognition. Changed my best friend into my greatest foe.
I know you didn't recognise Yana as a true part of you but he was. Maybe even the truest part of you.
Undamaged. Uncorrupted.
That is who you were when everything else was taken away.
When all the hurt and the fury and the fear were laid to rest.
So that is the man I will choose to remember.
The man at the end of the universe.
The man who built a miracle.
The man who alone shouldered the burden of a terrible truth so a few lonely survivors could cling to one final shining thread of hope.
Hope that you gave them.
You were brilliant Master.
You were brilliant and brave and selfless.
You were a hero.