Everything about the latest epic! See the Doctor regenerate! ...of the Tenth Doctor. Get the latest updates Making the Ood Watch The Monster Files BBC iD ...

indicating the Doctor has regenerated into one of his old forms for mysterious reasons. "David Tennant, previously known as the 10th Doctor, is now also known as the 14th Doctor," the BBC said.

The Doctor takes Donna to her first alien world - but the Ood-Sphere reveals some terrible truths about the Human Race. Meet the new Doctor! See the Doctor regenerate! ...of the Tenth Doctor.

The finale to the Tenth Doctor's era is one of the most eagerly ... and at the close of the episode he encountered Ood Sigma and the TARDIS cloister bell tolled... all ominous portents for the ...