Gallifrey is in a state of crisis, facing destruction at the hands of an overwhelming enemy. And the Doctor is involved in three different incarnations - each caught up in a deadly adventure, scattered across time and space. The web of time is threatened - and someone wants the Doctor dead. The three incarnations of the Doctor must join together to set time back on the right track - but in doing so, will they unleash a still greater threat?

October 1930. His Majesty's airship, the R101, sets off on her maiden voyage to the farthest-flung reaches of the British Empire, carrying the brightest lights of the imperial fleet. Carrying the hopes and dreams of a breathless nation. Not to mention a ruthless spy with a top-secret mission, a mysterious passenger who appears nowhere on the crew list, a would-be adventuress destined for the Singapore Hilton...and a Time Lord from the planet Gallifrey.

One would-be assassin is in a mental ward. Another's on the run. Their intended victim is stirring up the mobs. Terrorists are planning a strike of their own. A talk-radio host is loving every minute of it. A Whitehall insider whispers about a mysterious UN operative with a hidden agenda. Everyone's got someone they want to be afraid of. It'll take only a little push for the situation to erupt - and something is doing the pushing. But you can trust the Doctor to put things right. Can't you? Written by: Jonathan Blum.

On a dark, frozen planet where no planet should be, in a doomed city with a sky of stone, the last denizens of Earth's long-lost twin will pay any price to survive, even if the laser scalpels cost them their love and hate and humanity. And in the mat-infested streets, around teatime, the Doctor and Nyssa unearth a black market in secondhand body parts and run the gauntlet of augmented police and their augmented horses.

Landing in Alaska, the Doctor and Nyssa encounter a group of people in a most unusual house, cut off not only by the harsh climate but by their individual secrets and obsessions. Millionaire Shaun Brett is utilising chunks of the local area to construct a shrine to his dead father. But when deadly creatures start roaming outside and a terrifying discovery is made inside the house, the Doctor realises that Brett has unleashed an unimaginably ancient force. Written by Stephen Cole. Directed by Gary Russell.

An excellent jumping-on point for new listeners... Paul McGann's Eighth Doctor starts another phase of his adventures with a brand new companion (Lucie Miller - played by the award-winning Sheridan Smith) and an all-star supporting cast. Originally broadcast on BBC Radio 7.

In a desolate Cornish landscape littered with relics of prehistoric man, the Doctor and Evelyn uncover a catalogue of mysteries. What is the secret of the fog? Can the moor be haunted by a demonic host of imps? And what is Brigadier Lethbridge-Stewart doing in Pengriffen? Teaming up with his old friend, the Doctor realises that an ancient conflict is nearing its conclusion - and Lanyon Moor is set to be the final battleground. Written and directed by Nicholas Pegg.

On New Year's Eve, 1930, the Doctor lets Charley keep her appointment at the Raffles Hotel in Singapore. But his unease at what he's done to time by saving her life soon turns into fear. Sebastian Grayle: immortal, obsessed, ruthless, has come to the city to meet the Time Lord. To the Doctor, he's a complete stranger, but to Grayle, the Doctor is an old enemy. An enemy that, many years ago, he finally succeeded in killing. And this is his only chance to gloat.

The human race is locked in deadly combat with the android hordes in the Orion System. Light-years from the front line, the Doctor and Charley arrive to sample the dubious delights of a galactic backwater, little suspecting that the consequences of the Orion War might reach them there. But High Command's lust for victory knows no bounds.

Tracking a nexus point in time, the Doctor meets Dr. Evelyn Smythe, a history lecturer whose own history seems to be rapidly vanishing. The Doctor must travel back to Tudor times to stabilise the nexus and save Evelyn's life. But there he meets the Queen of England and uses all his skills of diplomacy to avoid ending up on the headman's block.... Written by: Jacqueline Rayner. Directed by: Gary Russell.

When the planet Archetryx is threatened by a Dalek assault squad, the Doctor and Evelyn become embroiled in an ever-deepening mystery. What has become of President Romana, missing for 20 years? What lurks in the vast gravity wells of Archetryx? What is the secret of the ancient element the Daleks are synthesising - and how does Gallifrey feature in the plans? The Doctor finds that if his oldest enemies cannot conquer the universe, they will watch it go up in flames....

Zagreus sits inside your head. Zagreus lives among the dead. Zagreus sees you in your bed and eats you when you're sleeping....

The Doctor and Charley travel to the remote Cimmerian System to unravel the mystery of its sun. But darkness has already embraced the scientific base on Cimmeria IV in more ways than one. In a fight for survival, the Doctor must use all his wits against a deadly artificial lifeform and an ancient race whose return to the Cimmerian System threatens suffering and death on an apocalyptic scale. Written and directed by Nicholas Briggs.

The web of time is stretched to breaking. History is leaking like a sieve. In the Citadel of Gallifrey, the Time Lords fear the end of everything that is, everything that was...everything that will be. The Doctor holds the Time Lords' only hope - but exactly what lengths will the Celestial Intervention Agency go to in their efforts to retrieve something important from within his TARDIS? What has caused Imperiatrix Romanadvoratrelundar to declare war on the rest of creation? And can an old nursery rhyme about a monster called Zagreus really be coming true?

The Doctor and Romana find themselves in the Proxima System, where enigmatic Conglomerate CEO Cuthbert has been conducting his infamous 'experiment'. An experiment which might accidentally rip the universe apart. Meanwhile, living conditions on Proxima Major have become harsh and hostile. Climate change has turned the landscape into a freezing wasteland and an alien power has condemned much of the population to life inside internment camps.