Bride-to-be Donna vanishes as she walks down the aisle to marry boyfriend Lance. To her complete astonishment - and the Doctor's - she reappears in the Tardis. As the Time Lord, still reeling from Rose's departure, investigates how Donna came to be there, the duo uncover a terrifying enemy. How far will the Doctor go to save Earth from the latest alien threat?

During an alien emergency in London, a woman called Donna Noble must search for an old friend who can save the day - a man named the Doctor. But can even the Doctor halt the plans of the mysterious Miss Foster?

Aided by the Rattigan Academy, the Sontarans establish a covert base at the mysterious ATMOS Factory. Can the Doctor stop the Sontarans from unleashing a potent terror that will bring the world to its knees?

The Sontarans continue their evil plot and begin to "choke" the Earth. The Doctor and Donna, now teamed with Martha have to stop them! Can they save Earth before it's too late?

Whilst attending a carnival on the Chino-planet of Shan Shen, Donna is cajoled into having her fortune read, where her past is carefully examined. With the Doctor missing, Donna must work with Rose, a traveller from a parallel universe, to prevent darkness encompassing the whole of the universe.

The Earth has been moved, and it's a race against time as Donna and the Doctor try to find it before the Daleks destroy everything; they head for the Shadow Proclamation and the Medusa Cascade. Meanwhile on Earth a veritable bevy of ex-companions join together to contact the Doctor and take down the Daleks. Can Captain Jack, Sarah-Jane, Martha Jones and Rose find the Doctor in time...

The Earth has been overwhelmed and the universe faces dominion by the resurgent forces of a terrifying and limitless empire led by one of The Doctor's greatest enemies. Aiding the Time Lord in a final battle are several of his closest allies and companions, but for one of them, a price will be paid...

Facing his mortality, the Doctor returns to Earth find the planet's population haunted by horrific nightmares all their own. Reuniting with Wilf, The Doctor investigates a lingering mystery that threatens to unravel the planet as an old enemy prepares to be reborn.