David Tennant's return as the Doctor called for some very creative writing from Russell T Davies, but the seed for such a twist was planted years ago.

Enjoy ten of the Tenth Doctor's most memorable moments. Introducing the Tenth Doctor! From his very first moments he was charming, unpredictable and entirely brilliant! We find out that the Tenth ...

Got a problem with that? Everything about the latest epic! See the Doctor regenerate! ...of the Tenth Doctor. Get the latest updates Christmas Trail Watch Kiss from a Rose BBC iD ...