Bingowings said:
My personal fav scenario is that after being thrown into the Time War the last time we saw him the Master becomes a previously absent element in it's last hours.
He subdues Rassilon makes a temporary alliance with the Daleks and ends the war.
The temporal tinnitus is removed The Master is no longer a maniac and by way of a thank-you he is made high president.
The Time Lords still pretend to be extinct and focus on tracking down the man that almost destroyed them so they can return the favour.
The Master as the Hero of Gallifrey and the Doctor as the bogeyman of the Time Lords.
I wish I'd come up with that before.
Ooo!! That's even better!