Episode list

Settling as his Fourth incarnation, the Doctor goes in search of the Monk, with a vague memory that he had something to do with his degeneration. On Earth, the Monk is meddling, bringing Sarah Jane Smith to the future UNIT HQ to steal a device for an alien race. The Doctor must help Kate Stewart and Osgood foil an invasion before he can confront the Monk about what he knows.

Suffering the effects of degeneration, the Doctor heads towards the end of the universe in search of answers. Instead, he finds his daughter - Jenny - and an Artist whose works appear to mark the end of every world they touch. The Doctor stabilizes into his Fifth form to join forces with Jenny and the Curator to solve the mystery of the Final Gallery and the art it has collected.

In the midst of the Time War, the Time Lords have received a communication from Falkus, the prison moon of Skaro. Its sole inmate, Davros, wishes to make them an offer. He will help them win the Time War... but only if the Doctor comes to his rescue.

Back on Earth, the Doctor finds a clue in the search for the origins of the degeneration weapon. In his Sixth body, he meets Jackie Tyler and Lady Christina de Souza - thrown together by fate, or something more? - in pursuit of a powerful item of jewelry. Meanwhile, a Time Lord renegade has duped Harry Sullivan into helping him stop the Doctor's travels before they begin - and all are set on a collision course.

The First Doctor arrives in Victorian London amid a Martian invasion. But he discovers all is not what it seems when Missy appears. Soon, the Doctor is propelled into a future incarnation - the Tenth - but he is not alone in battling Missy and her Martian invaders. The Paternoster Gang - Madame Vastra, Jenny Flint and Strax - are also here to assist. But can they offer the Doctor any help in solving his own degeneration mystery?

Slipping between bodies, the Ninth Doctor finds his TARDIS caught between universes as the cosmos starts to break down. A Doctor from another reality arrives and they join forces with Liv Chenka and the Lumiat to find the cause. Someone has desecrated the mythical Hall of the Time Lord Immemorial, where the sands of time from the multiverse are held. And those sands are running out.

The Doctor responds to a distress call from his granddaughter, Susan, taking him to the Diamond Array: a huge multidimensional space station. Once there, his instability increases, as the Fourth and Eighth Doctors discover the Array's terrible purpose. Meanwhile, River Song has made a deadly alliance to try to save her husband. And the truth about the Doctor's degeneration will finally be revealed.

The Time War. Dealing with the repercussions of degeneration, the Doctor has a limited window of time to evade capture, recruit old allies, wage a war, and find out what's really going on. A warrior is being hunted by a mysterious stranger in a TARDIS. A rogue agent has been assigned a mission to eliminate a dangerous foe. This is a fight between a war criminal and a fugitive. A fight between Doctors.