Mysterious death. Grieving mother. Government conspiracy. Edinburgh hackette Nicola McLaren has heard it all before. Just a routine investigation into the whole heap of nothing that forms the humdrum grind of real-life journalism, right? Wrong. Before long people tried to kill her, a lunatic ex-soldier abducts her and she finds herself chased half way across the country to meet aliens she's not even sure exist. Oh, and then she has to save the world.

Medieval legends tell many tales of the Greenwood: magical tales of King Arthur and the Fair Folk; rousing tales of Robin Hood and his Merry Men; and harrowing tales of a monstrous plant demon that could possess men, corrupting their very beings. When alien pods land in an English forest, will the Krynoids claim another world, or can medieval might and wisdom triumph?

Your ship is at the bottom of the English Channel, your crew are probably dead, and your nearest source of food is in a Loch six hundred miles away. And the natives are insane. Life isn't looking too promising for a Zygon called Bobby. Victorian London is not a great place to be if you're a wounded shape-shifting alien.

Right from its creation, the secret intelligence service of Great Britain was touched by a streak of ritual: its initiations were usually occult, its codes based on astrological or alchemical ciphers. When Faction Paradox first entered Earth history in the 1700s, the Service took an immediate interest in the new arrivals’ own ritual practices, and in the inevitable feud between British and Faction agents no single figure was as important as Sabbath.

Era: Human historical (later period). Technology: Military (self-contained), non-time-active. By the end of the fifth millennium AD, the homunculi created by the human species - clones, cross-breeds, fighting-machines and artificial intelligences of all descriptions - outnumbered humanity by more than thirteen to one: But even so, there were no creations like those of Peking. Heading a 1,000-strong army of individually-crafted automata, the 12 commanders were self-aware embodiments of the oriental zodiac, forged to a strict astrological design, and said to incorporate history itself in their operating program.

It’s now acknowledged that the Great Houses were largely responsible for creating the current shape of history, not simply by interfering in major events (although they may have dabbled) but by engineering the entire framework of history as a single definite structure. What’s less well-known is just how easy it is to access that structure’s foundations. Before the War, it was usual for Great House installations to be linked to the Houses’ “records library”, buried in the framework beneath normal time.

PRIMEra: Last thirteen million years. Technology: Military (blatant), limited time-awareness. It’s perhaps unwise to think of the Sontarans as a species, as such. A homunculus breed hatched by the million and engineered for full-engagement warfare, the Sontaran military machine is regarded by many time-active cultures as an “occupational hazard”: a force of nature rather than a race, compelled by duty and genetics to acquire new technologies for its endless war effort. It should be remembered, however, that with the backing of a higher power even the crudest of breeds can become something quite different.

"Our planet of Galspar is renowned for the quality of its ice cream, which is shipped across the universe. Life on Galspar is perfect - just as the eyescreens tell us it is. There are those who say that if you look in the right places and ask the right questions, then this perfection is exposed as an illusion, and a terrible conspiracy is uncovered. But there have always been some intent on disruption, who are not happy with the jobs they themselves have selected or with the wide range of freedoms granted by the Company. Ignore these troublemakers, citizen, and you'll see that they do indeed disappear...."

It is a time of restoration. Ten millenia have passed since the solar flares devastated the planet Earth and now humanity has come home to reclaim and rebuild. But scientists at Mombassa Station are about to resurrect a deadly menace that was once destroyed. A menace that will stretch from the depths of the African continent, to the ancient and decaying Nerva Beacon still orbiting high above. Can a small group of Gene-techs hope to survive the rush of Race Memory?

General Bestok is a hero of the Sontaran Empire. His battles have been fought according to certainties programmed into his very being. However questions are coalescing at the back of his mind. Why is he being given illogical orders? What has really brought Field Marshall Drell all the way from their home planet to the front line and what is the meaning behind his cryptic remarks? Maria has spent most of her life in the murky, shifting world of colonial politics. She likes to think she is a survivor.

Treachery is afoot on the Genesis, a cargo ship travelling at the very edge of Human space. When Silvia Tanner opens herself up for "a bit of honest corruption" with the Sontarans, she soon finds she has bitten off more than she can chew. With a Sontaran aboard, and the sudden unexpected arrival of an investigator calling himself 'Alex', the stakes are suddenly raised even higher than before, and secrets will out.

“All is Krynoid, all will be Krynoid..." On an isolated Yorkshire hill farm a strange species of plant has been discovered. Between the stalks of wheat and through the ancient hedgerows an alien horror is silently choking the land. Eve Black a young biologist working for the Ministry of Agriculture is called to the farm to investigate, but instead of finding a simple case of weed infestation her enquiries uncover a sentient hostile life form.

“I bring you a message...from God.” Ganta 4, a desolate rock in a forgotten backwater of the galaxy. Here two groups of humans cling to existence in the grip of wildly differing ideologies. For the miners the motivation is Amyrillium, for the colonists the prize is nothing less than God's New Eden.

To maintain their vessel, the Mistress and K9 must locate a sustainable power source and e-space-compatible technology - or lose the ability to time travel forever. Their answer lies within an ancient derelict Dyson sphere. But all is not as it seems, and the arrival of alien archaeologists from planet Herta, searching for evidence of the ancient, brings further danger.

From suspicious activities in an English stately home to the rainforests of Colombia - the UN Military and their scientific advisor Guy Dean are on the trail of a global conspiracy - one that threatens the destruction of civilisation. The Zygons have returned to Earth and this time they will give no quarter in their search for a new homeland.