The Doctor and The God of Time

The Last Lord Time, trying to understanding the Face of Boe's message, is slung to the very end of time on a quest.
There, a stranger offers to show him how to get to Rose and revive the race of the Time Lords. The Doctor demands to know how and who this stranger is with all the answers-he's convinced this is some sort of Dalek trick...
The stranger says he's Chronos, the God of Time, (and he considers Rassilon a twit) and it was time the true age of the Time Lords comes to pass, and Rose is needed (read- lots and lots of 'dancing').

And then he reveals his true face....

Oh, this sounded so much better in my head....