Series 4

The RMS Titanic crashes into the TARDIS on Christmas Eve 2007. When disaster strikes, plucky waitress Astrid joins forces with the Doctor to do battle with a host of homicidal angels. But who will survive the voyage?

Written by Russell T Davies

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?

Written by Russell T Davies

The Doctor and Donna travel back into ancient history. When they arrive in 79AD, however, they discover psychic powers and beasts of stone running riot in the streets of old Pompeii. The time-travellers face their greatest challenge yet. Can established history be changed, or must the Doctor let everyone die?

Written by James Moran

The Doctor takes Donna to her first alien world, the Ood-Sphere. But when they discover a dying Ood in the snowy wastes, it leads them to an industrial complex, where they discover some terrible truths about the human race and its relationship with the native Ood.

Written by Keith Temple

Martha Jones summons the Doctor back to modern-day Earth, but an old enemy lies in wait. With the mysterious ATMOS devices spreading across the world, Donna discovers that even her own family is not safe from the alien threat, but is it too late to save them?

Written by Helen Raynor

The Sontarans activate their masterplan and begin to choke the whole of planet Earth. UNIT is left defenceless, with a traitor in their ranks. And as interplanetary war edges closer, the Doctor has to fight to keep both Martha and Donna alive, but will he have to make the ultimate sacrifice?

Written by Helen Raynor

The Doctor meets the most important woman of his life on the distant planet Messaline, in the middle of an endless war. But as General Cobb threatens genocide, and Martha is kidnapped by the Hath, the Doctor faces an even greater battle. Can he find peace with his own child?

Written by Stephen Greenhorn

The Doctor and Donna arrive in 1926 on the day before Agatha Christie went missing for 10 days. At a dinner party hosted by Lady Clemency Eddison, the Doctor and Donna join forces with the world's most famous crime novelist to encounter a body in the library, poisoned cocktails and a Vespiform seeking revenge.

Written by Gareth Roberts

One hundred years ago, the Universe's greatest library was sealed off with only a cryptic warning as explanation: 'Count the shadows.' However, it now appears that the shadows are on the move again. The Doctor and Donna must uncover the terrible truth behind the Nodes and the horrifying Data Ghost to uncover the Library's secret.

Written by Steven Moffat

As the shadows rise and march, the Doctor forges an alliance with the mysterious River Song. But can anyone stop the Vashta Nerada? While the Doctor discovers long-buried secrets and revelations about his own future, the sinister Nodes declare that Donna is doomed.

Written by Steven Moffat

The Doctor is trapped, alone, powerless and terrified, on the leisure planet Midnight. Soon, the knocking on the wall begins. Only a woman called Sky seems to know the truth, but as paranoia turns into a witch-hunt, Sky turns the Doctor's greatest strengths against him, and a sacrifice must be made

Written by Russell T Davies

Donna's entire world collapses, but there's no sign of the Doctor. Instead, she finds help from a mysterious blonde woman, a traveller from a parallel universe. But as Donna and Rose Tyler combine forces, are they too late to save the whole of creation from the approaching darkness?

Written by Russell T Davies

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.

Written by Russell T Davies

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.

Written by Russell T Davies

It's Christmas Eve in 1851 and Cybermen stalk the snow of Victorian London. When the Doctor arrives and starts to investigate a spate of mysterious deaths, he's surprised to meet another Doctor, and soon the two must combine forces to defeat the ruthless Miss Hartigan. But are two Doctors enough to stop the rise of the CyberKing?

Written by Russell T Davies

While investigating a wormhole in London, the Doctor meets Lady Christina de Souza and they are both accidentally transported in a red London bus along with the other passengers to a desert planet which was destroyed by metallic sting ray-like aliens that travel between planets via wormholes.

Written by Russell T Davies and Gareth Roberts

Mars, 2059. Bowie Base One. Last recorded message: 'Don't drink the water. Don't even touch it. Not one drop'. The Doctor faces one of his darkest and most action-packed adventures yet as he arrives on Mars to find a terrifying alien virus sweeping through the colony. But he knows the events of 2059 hold an important place in history and getting involved will mean taking the law of time into his own hands. Has he gone too far?

Written by Phil Ford and Russell T Davies

Christmas Eve, and the Doctor is reunited with Wilf, to face the return of an old enemy. Something terrible stalks the wastelands of London, while far away, the Immortality Gate reaches completion. But the warnings of the Ood signify an even greater danger, as the Doctor faces his darkest hour yet.

Written by Russell T Davies

The Doctor has faced Daleks, Cybermen, Angels and Devils, but now stands defeated at the end of his life, as the Master's victory unleashes the greatest terror of all. With an ancient plan closing around the Earth, only the Doctor can stop the cataclysm, but is the price too great to pay?

Written by Russell T Davies