Dr. Who visits the desolate planet of Karn. Kriz: John Scott Martin. Condo: Colin Fay. Solon: Philip Madoc. Ohica: Gilly Brown. Maren: Cynthia Grenville. Sarah: Elisabeth Sladen.

Missy is about to come face to face with the Doctor, and an impossible choice is looming.

The killer is on a rampage in the sand-miner. Tom Baker, Louise Jameson. SV7: Miles Fothergill. Uvanov: Russell Hunter. Cass: Tariq Yunus. Borg: Brian Croucher. Poul: David Collings. Toos: Pamela Salem. Dask: David Bailie.

After the Doctor and his friends are exposed to a strange plague, Sarah becomes infected. Meanwhile, the Cybermen plan to destroy the planet of gold. Tom Baker, Elisabeth Sladen. Tyrum: Kevin Stoney.

Ghosts of the past and future crowd into the lives of the Doctor and Clara, and send them on an adventure that takes them to the end of the universe.

This year's Christmas Special will be Eleventh Doctor Matt Smith' s final story and will feature the introduction of Twelfth Doctor Peter Capaldi. Orbiting a quiet backwater planet, the massed forces of the universe s deadliest species gather, drawn to a mysterious message that echoes out to the stars. And amongst them-the Doctor. Rescuing Clara from a family Christmas dinner, the Time Lord and his best friend must learn what this enigmatic signal means for his own fate and that of the universe.

Separated from the Doctor, Clara discovers a new menace from another dimension. But how do you hide when even the walls are no protection? With people to save and the Doctor trapped, Clara goes against an enemy that exists beyond human perception.

In the mysterious world of the Nethersphere, plans have been drawn. Missy is about to come face to face with the Doctor, and an impossible choice is looming… “Death is not an end” promises the sinister organization known only as 3W – but, as the Doctor and Clara discover, you might wish it was.

When terrifying events threaten Coal Hill school, the Doctor decides to go undercover. The Skovox Blitzer is ready to destroy all humanity - and worse, any second now, Danny Pink and the Doctor are going to meet.

With Cybermen on the streets of London, old friends unite against old enemies, and the Doctor takes to the air in a startling new role. Can the mighty UNIT contain Missy? As the Doctor faces his greatest challenge, sacrifices must be made before the day is won.