Russel T Davies pulls out all the stops to herald a dramatic new dawn for the popular BBC series

Doctor Who fans were surprised with a familiar face as Jodie Whittaker’s  13th Time Lord regenerated into David Tennant in the dramatic  conclusion of the show’s BBC centenary special.

It was previously announced that Scottish actor Tennant, who first  stepped into the Tardis in 2005 to play the 10th Doctor, would be  returning to the sci-fi series

Russell T Davies, said: “If you thought the appearance of David Tennant  was a shock, we’ve got plenty more surprises on the way.

Whittaker’s last venture as the Doctor was loaded with drama as it saw  her fight for her existence against some of her deadliest enemies: The  Master, the Daleks and the Cybermen.

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The episode, titled The Power Of The Doctor, also saw the surprise  return of actors who have played Time Lords from the ages .