The Doctor tries to save the lives of the passengers on an orbiting cruise ship called Titanic.
With a new weight-loss pill tested in London by Adipose Industries, The Doctor goes to investigate the sinister truth behind the product, only to find out that his old friend Donna Noble is investigating as well.
The Doctor and Donna visit Pompeii in AD 79, on the eve of the eruption of Mount Vesuvius.
Finding themselves on the Ood-Sphere planet in the 42nd century, The Doctor and Donna discover the truth about the Ood's willingness to serve humankind.
The Doctor is called back to modern-day Earth by an old friend as an old enemy starts some new troubles. 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 Doctor and Donna must stop the Sontarans from choking the Earth.
The Doctor lands on the remote planet Messaline as an age-old war rages and the threat of genocide looms.
The Doctor and Donna meet Agatha Christie at a manor owned by Lady Eddison.
The Doctor and Donna land in a frightening position in the far future, and the key to their survival could be in the nightmares of a little girl.
With the library darkening, the Doctor takes on the Vashta Nerada while figuring out what links River Song to his future. Meanwhile, Donna finds out the mystery of Dr. Moon and the Girl.
While visiting the planet Midnight, full of beautiful, high-tech cities, a terrifying problem arises that leaves the Doctor powerless.
As Donna's world collapses, she finds help from a mysterious blonde woman - but can Donna and Rose stop the approaching Darkness?
Earth's greatest heroes assemble to fight the New Dalek Empire, but a fearsome old enemy waits in the shadows.
Inside the TARDIS, about to be destroyed, Donna collapses near the Doctor's severed hand and commences a mutual transfer of energy, eventually creating a second Tenth Doctor.