So finally, the episode 12 title has been revealed, and here it is, plus the synopsis:
4.12: The Stolen Earth
Earth's greatest heroes assemble in a time of dire need, in tonight's penultimate episode in this series of Russell T Davies's Bafta Award-winning time-travelling drama. 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...
David Tennant plays the Doctor and Catherine Tate plays his companion, Donna Noble.