You've probably all heard that David Tennant is finishing up as the tenth Doctor Who all too soon, to be replaced by 26 year old Matt Smith, the youngest actor to play the Doctor in the BBC’s iconic series. David Tennant will make his final appearance in the last of the television specials that are scheduled to be aired in 2009 and early 2010. But how will it all come to pass? Who or what will cause David Tennant to regenerate?
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