Billie Piper

The Doctors embark on their greatest adventure in this 50th Anniversary Special: in 2013, something terrible is awakening in London’s National Gallery; in 1562, a murderous plot is afoot in Elizabethan England; and somewhere in space an ancient battle reaches its devastating conclusion. All of reality is at stake as the Doctor’s own dangerous past comes back to haunt him.

Donna Noble is determined to find the Doctor again - even if it means braving the villainous Miss Foster and her hordes of sinister Adipose. But when the alien threat escalates out of control, can Donna find her Time Lord before the march of the Adipose begins?

Earth's greatest heroes assemble in a time of dire need. But can the Doctor's secret army defeat the might of the new Dalek Empire? With battles on the streets and in the skies, the Doctor and Donna must brave the Shadow Proclamation to find out the truth. However, a fearsome old enemy waits in the shadows.

The entire universe is in danger as the Daleks activate their masterplan. The Doctor is helpless, and even the TARDIS faces destruction. The only hope lies with the Doctor's secret army of companions - but as they join forces to battle Davros himself, the prophecy declares that one of them will die.

The Doctor faces the end of his life as the Master's plans hurtle out of control. With the sound of drums growing louder, and an ancient trap closing around the Earth, the Doctor and Wilf must fight alone. But sacrifices must be made, and the deadly prophecy warns: "He will knock four times."