After being brought back to life in The Parting of the Ways, Captain Jack Harkness was just left on the Gamestation by the Doctor and Rose. In this episode, Captain Jack Harkness storms back into the Doctor's life, and the TARDIS is thrown to the end of the universe itself.

Harry Saxon becomes Prime Minister and his reign of terror begins – but that's only the start of his ambitions, as he announces mankind's first contact with an alien race, the Toclafane. An audacious plan spanning the whole of time and space begins to close around the Earth, in the penultimate episode of Russell T Davies's Doctor Who.

One year has passed since the events of "The Sound of Drums." The Earth has been conquered and its population enslaved, the Doctor is the Master's prisoner, and the warships of a new Time Lord Empire rise from the ashes. The fate of the world is in Martha Jones' hands.

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.

Dark forces amass at The Gate. Only The Doctor stands between the age of order and the time of chaos... only one song remains to be sung...

Friendship drives the Doctor into the rashest decision of his life. Trapped on a giant spaceship, caught in the event horizon of a black hole, he witnesses the death of someone he is pledged to protect. Is there any way he can redeem his mistake? Are events already out of control? For once, time is the Time Lord’s enemy.

“Without hope, without witness, without reward.” The Mondasian Cybermen are on the rise. It’s time for the Doctor’s final battle…