In her bedroom on board the TARDIS, Nyssa dreams of her long lost home, and a Forbidden Archway that never really existed - or did it? In the TARDIS corridors she finds a flight of steps, a door marked ‘keep out’, and beyond, a locked room full of secrets. In particular a casket containing a jewel seems to call to her. “Nyssa of Traken, do you want to be my friend?” So begins a journey that takes Nyssa from snow capped mountains to vast cities, and introduces her to people she seems to know so well. What dangerous landscape has she wondered into - and can she ever escape to safety, and the comfort of her travelling companions?

A single old man. One who knows what it is to fight, who understands an enemy few think of any more, who has had to make terrible decisions in his life. And who now, in a museum, with that enemy in front of him reduced to a mere curiosity... Meets Kalendorf.

"It's already done. You are dead. You just don't know it yet." Iolas is a man with a plan. It has 1009 Easy Steps, all of them now happening successfully. One. By. One. The very last step? The death of the Doctor...

"A few more random landings will shake off the Daleks. So to speak." But for the Doctor, Steven and Sara, the landings are anything but random. It's Christmas Day... So many times. What terrible secret is bringing the time travellers to the same day in different years?

The Doctor and Leela arrive on a barren plain in the Soviet Union of the 1950s. Twisted wreckage and remains speak of the tests of a destructive new power. The scientists responsible live in terror of their political masters. But now they all have something else to be scared of...

Yesterday there were two Time Lord prisoners on Earth - the Master in his cell, the Doctor in his exile. But today the Doctor's not quite feeling himself. Today he's seeing things from a different perspective. And today the Master's going to escape...

"A roaming alien doctor - I can smell a series in this!" EarthCom cameraman Marsh is a man on a mission: to film some incredibly rare wildlife on a remote world. But life on this planet is both busier and quieter than expected: and it holds Marsh's future in its grasp...

The Sixth Doctor and Mel are in the Swiss mountains for some rest and relaxation after recent exertions. But soon the Doctor finds himself involved in a mystery, as those working in the resort's hospitality prove preternaturally willing to help. Is it just mere chance? The Doctor's intuition is that something is wrong: but intuition could be the very problem here...

A wonder of modern technology; the vast, secure building waits. A part of the building's very fabric; the advanced computer Oracle waits for a face its systems recognise. And at the heart of this steel, concrete, cable and flesh; a figure thought long-dead waits for a visitor. Nimrod has one last meeting with his Doctor...

The Eighth Doctor and Lucie Miller have stopped off in Little Morton for a fry-up. It's not the healthiest way to start a day, but better than some: the Major from the local barracks has just fallen to his death. Or has he? A visit to the hospital highlights the surprising levels of health in the soldiers. There's clearly something going on beneath the surface at Little Morton: and it's about to come to light...