Part 1 & 2. It's the Tenth Doctor's final journey - but his nemesis, The Master, has been reborn. A terrible shadow falls across the Universe as great danger approaches, and the Doctor faces the end of his life as the Master's plans hurtle out of control.

Dr. Who must defeat the Wirrn to save the human race. Noah: Kenton Moore. Vira: Wendy Williams. Lycett: John Gregg.

Bodies are found in Victorian Yorkshire with skin that is waxy and glowing red.

A spaceship salvage team drags the TARDIS on board, sending its systems into meltdown.

Who will rescue the Doctor and Clara before they too fall victim to the Crimson Horror?

The search for Clara (Jenna-Louise Coleman) brings the Doctor (Matt Smith) to London, 2013, where something deadly is waiting in the Wi-Fi.

First in a two-part special leading up to David Tennant's departure from the role he has played for four years. At the end of November's adventure The Waters of Mars, the Doctor set off in the Tardis seemingly determined to meet his fate head on, carrying with him the Ood's warning that his song is coming to an end and the clue that 'he will knock four times.' Now, one of his greatest enemies has been reborn, on Christmas Day, and with both determined to cheat death, the battle rages from the wastelands of London to the mysterious Immortality Gate. As well as the return of John Simm as the Master, this episode sees the reappearance of Donna (Catherine Tate) and her grandfather Wilf (Bernard Cribbins), who takes on the role of the Time Lord's companion for this two-parter. As Who fans will know, this is not the first time Cribbins has accompanied the Doctor on his adventures - he also took his place alongside Peter Cushing's Doctor in the 1966 movie Daleks' Invasion Earth: 2150 AD. Other guest stars include Timothy Dalton, David Harewood and June Whitfield

Someone is kidnapping the Doctor's friends, leading him toward the one place in all of time and space that he should never go.

The Doctor and Donna visit Pompeii in AD 79, on the eve of the eruption of Mount Vesuvius.

The Doctor takes Donna to her first alien world, but the Ood-Sphere reveals some terrible truths about the human race.

Part 1. Sontaran warriors set their sights on the Earth and its inhabitants

Part 2. As poison gas suffocates the Earth's population, the Doctor and UNIT team members work to eliminate the threat.

The Doctor meets the most important woman of his life.

Agatha Christie's 10-day disappearance in 1926 may have been the result of amnesia, a nervous breakdown, or a giant alien wasp.

Part 1. The Doctor and Donna must uncover the truth behind the Nodes and the Data Ghost to uncover the library's secret.

Part 2 . As the shadows rise, the Doctor forges an alliance with the mysterious River Song.

The Doctor is trapped, powerless and terrified, on the planet Midnight, as a knocking on the wall begins.

Donna gets help from a mysterious blond woman.