Russell T Davies may not be staying on Doctor Who past 2009's special episodes, but David Tennant is โ€” at least according to Davies. The outgoing producer told British newspaper the Sunday Express that "David may never leave, he could go on forever... I haven't talked to him about leaving. Maybe it will never happen. Maybe he'll be 70 and have to be taken off set." Of course, he may simply be lying, considering that the 2008 Christmas Special is called "The Next Doctor." [Digital Spy]