Doctor Who - Season 4 (2008)

Finding themselves on the Ood-Sphere planet in the 42nd century, The Doctor and Donna discover the truth over the Ood's willingness to serve humankind.

UNIT's newest recruit Martha Jones enlists The Doctor's help to investigate kid genius Luke Rattigan and his ATMOS system that is used in every car on Earth.

With planet Earth choking under the poison sky, the Doctor must stop the Sontarans' threat to the planet.

Caught in the middle of a war between the Humans and the Hath in the planet Messaline, the Doctor finds himself once again a father.

With a 1926 dinner party turning into a murder mystery, The Doctor and Donna Noble get the chance to meet Agatha Christie on the eve of her well-known 9-days disappearance.

The Doctor and Donna visit a planet-sized library but soon realise that the planet is devoid of life, that is until River Song and her team of archaeologists arrive. As they unravel the library's mystery, something lurks in the shadows.

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.

As part of a well-deserved holiday, the Doctor takes a tour on a planet called Midnight. Little does he know that something is knocking on the walls, although the planet shouldn't be inhabited. Soon the passengers begin to panic when one of them is possessed.

What would happen if Donna never met the Doctor? How would Earth handle the Racnoss, the falling Titanic or the Sontarans? Aided by a familiar blonde time traveler, Donna corrects the alternate time line from happening.

The return of an old enemy leaves Earth along with 26 other planets stolen from their places. As the Doctor and Donna look for the whereabouts of Earth, former companions of the Doctor assemble a resistance against the new Dalek Empire.

In the wake of Davros' threat to destroy the existence of the Universe itself, the Doctor's companions unite to stop the Dalek empire. Which one will die by the prophecies and what will the fate be for the Doctor?