Benedict Cumberbatch (who could make a great Rassilon).
We already have a great slobberer...er...I mean Rassilon, in Timothy Dalton.
Cumberbatch could be an excellent Master though, if they're ready to move on from the goofy John Simm version.
One Day I hope to be the Man my Cat thinks I am
Where are we going? And why are we in this Handbasket?