Sarah Jane Smith, investigative journalist and former companion to The Doctor, is back in a brand-new CBBC drama from the makers of Doctor Who. And in the first two-part story of the series she faces some familiar alien enemies of The Doctor as the Slitheen are back and out for revenge...

On their first day at their new school Maria and Luke soon realise that all is not as it seems. There's a funny smell, the food keeps going off, the teachers keep farting and the new technology block is hiding some dark secrets.

With their suspicions aroused, Sarah Jane, Maria and Luke set about investigating, joined by their new friend Clyde. They soon discover that the Slitheen have disguised themselves as teachers as part of a deadly plan which threatens the future of the Earth.

But as Maria, Luke and Clyde become trapped in the new technology block in the clutches of the Slitheen and with Sarah Jane under attack from another of the alien monsters, will the gang be able to stop the Slitheen before it's too late?

Martha in the Mirror by Justin Richards

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? Who is the hooded figure that watches from the shadows? And what is the secret of the legendary Mortal Mirror?

The Doctor and Martha don't have long to find the answers - an army is on the march, and the castle will soon be under siege once more.

Snowglobe 7 by Mike Tucker

Earth, 2099. Global warming is devastating the climate. The polar ice caps are melting.

In a desperate attempt at preservation the Governments of the world have removed vast sections of the Arctic and Antarctic and set them inside huge domes across the world. The Doctor and Martha arrive in Snowglobe 7 in the Middle East, hoping for peace and relaxation. But they soon discover that it's not only ice and snow that has been preserved beneath the Dome.

While Martha struggles to help with an infection sweeping through the holidaymakers the Doctor discovers an alien threat that has lain hidden since the last ice age. A threat that is starting to thaw.

The Many Hands by Dale Smith

Edinburgh, 1759.

The Nor' Loch is being filled in. If you ask the soldiers there, they'll tell you it's a stinking cesspool that the city can do without. But that doesn't explain why the workers won't go near the place without an armed guard.

That doesn't explain why they whisper stories about the loch giving up its dead, about the minister who walked into his church twelve years after he diedå

It doesn't explain why, as they work, they whisper about a man called the Doctor. And about the many hands of Alexander Monro.