The 2007 Christmas Special Stars Kylie Minogue as the Sinister Cyber Woman who Traps the Doctor And Tries to Make Him Bring back the Cyber Army.
As Doctor who is Half-way Through Series 3, The BBC Have Produced An Episode List for Series 4:
After Martha Is Axed at the End of "The last of the Time Lords", He finds New Companion Georgia Fisher Played By Emma Watson From Harry Potter
We only have a Few of the Episodes:
1) THEY SURVIVED
Georgia Embarks on a Stranger called the Doctor, this will be the Start of the Journey of the Lifetime
2) RETURN OF THE ICE WARRIORS
The doctor and Georgia Travel to the North Pole, But, Not as we Know it, They find the whole City has been Brainwashed by a Sinister Force
At the End of Episode 6) End of the Time War, the Doctor Is Attacked by a Cyber Gun which Causes him to Regenerate in Robert Carylile.