Del McAllen shivered, though it had nothing to do with the cold. He twisted his head, the torch mounted on his  helmet swinging its beam across the walls of the tunnel that had been roughly hewn from the ice, the pool of light twisting and skittering across the frozen surface. There was something wrong here, something he couldn't quite put his finger on.  It was unsettling him.

Castle Extremis – whoever holds it can control the provinces either side that have been at war for centuries. Now the castle is about to play host to the signing of a peace treaty. But as the Doctor and Martha find out, not everyone wants the war to end. Who is the strange little girl who haunts the castle? What is the secret of the book the Doctor finds, its pages made from thin, brittle glass?

The peace and quiet of a remote homestead in the 1880s American West is shattered by the arrival of two shadowy outriders searching for ‘the healer’. When the farmer refuses to help them, they raze the house to the ground using guns that shoot bolts of energy instead of bullets…

The Doctor’s been everywhere and everywhen in the whole of the universe and seems to know all the answers. But ask him what happened to the Starship Brilliant and he hasn’t the first idea. Did it fall into a sun or black hole? Was it shot down in the first moments of the galactic war? And what’s this about a secret experimental drive? The Doctor is skittish, but if Martha is so keen to find out he’ll land the TARDIS on the Brilliant, a few days before it vanishes. Then they can see for themselves. . .

The old village well is just a curiosity – something to attract tourists intrigued by stories of lost treasure, or visitors just making a wish. Unless something alien and terrifying could be lurking inside the well. Something utterly monstrous that causes nothing but death and destruction. But who knows the real truth about the well? Who wishes to unleash the hideous force it contains? What terrible consequences will follow the search for a legendary treasure hidden at the bottom?

When the TARDIS makes a disastrous landing in the swamps of the planet Sunday, the Doctor has no choice but to abandon Martha and try to find help. But the tranquility of Sunday’s swamps is deceptive, and even the TARDIS can’t protect Martha forever. The human pioneers of Sunday have their own dangers to face: homeless and alone, they’re starting to see that Sunday’s wildlife isn’t as harmless as it appears. Why are the otters behaving so strangely, and what is the creature in the swamps that is so interested in the humans, and the new arrivals?

Tiermann’s World: a planet covered in wintry woods and roamed by sabre-toothed tigers and other savage beasts. The Doctor is here to warn Professor Tiermann, his wife and their son that a terrible danger is on its way. The Tiermanns live in luxury, in a fantastic, futuristic, fully-automated Dreamhome, under an impenetrable force shield. But that won’t protect them from the Voracious Craw. A huge and hungry alien creature is heading remorselessly towards their home. When it arrives everything will be devoured.

It is almost Halloween in the sleepy New England town of Blackwood Falls. Leaves litter lawns and sidewalks, paper skeletons hang in the windows, and carved pumpkins leer from front porches. The Doctor and Martha soon discover that something long-dormant has awoken, and this will be no ordinary Halloween. What is the secret of the ancient tree and the book discovered tangled in its roots? What rises from the churchyard at night, sealing the lips of the only witness? Why are the harmless trappings of Halloween suddenly taking on a creepy new life of their own?

A vast starship, seemingly deserted, is spinning slowly in the void of deep space. Martha and the Doctor explore this drifting tomb and discover that they may not be alone after all. Who survived the disaster that overcame the rest of the crew? What continues to power the vessel? And why has a stretch of wooded countryside suddenly appeared in the middle of the craft?

The Doctor and Martha go in search of a real live dodo, and are transported by the TARDIS to the mysterious Museum of the Last Ones. There, in the Earth section, they discover every extinct creature up to the present day, all still alive and in suspended animation. Preservation is the museum’s only job – collecting the last one of every endangered species from all over the universe. But exhibits are going missing...