The BBC has confirmed that the popular actor, who previously played the role between 2005 and 2010, has officially returned as the 14th Doctor. Tennant told BBC News: "What a lovely, lovely thing ...

According to RTD during his commentary, the Fourteenth Doctor's bi-generation rippled ... might imply that he knows exactly who this mystery regeneration is and remembers the point in time when ...

As you can see below, the other Time Lords consign the Doctor to a life on earth at the end of the story, and explain the regeneration process that would go on to define the series. The Doctor is ...