Doctor Who - Vortex Ice / Cortex Fire is out today, written by Jonathan Morris and Ian Potter, directed by Ken Bentley and starring Colin Baker and Lisa Greenwood as the Sixth Doctor and "Flip" Jackson:

Vortex Ice by Jonathan Morris

In search of ‘exotic particles’, the Doctor and Flip arrive 700 feet underground, in a mine in Northern Mexico – only to run into a scientific expedition. Among their number, an exobiologist. They’re all on the hunt for alien life! Deep underground, the team finally uncovers a cave of vast crystals – like ice, despite the heat. And inside the crystal: something frozen. Something trapped in time. If only it were something simple, like a monster. But it’s far, far worse than that.

Cortex Fire by Ian Potter

The Doctor brings Flip to the futuristic city of Festin, the best vantage point to witness a unique astronomical light show. In a city governed by the all-powerful network known as the Cortex, they’re soon identified as outsiders – nihilists, perhaps, responsible for a wave of terror that’s been sweeping the city… But the truth is different. The people of Festin are burning up. Spontaneously combusting. And no-one knows why...

Doctor Who - Vortex Ice / Cortex Fire is available for £12.99 on Download and £14.99 on CD, or it can be bought as part of either a 6- or 12-story Subscription with prices starting from as little as £54. Subscribers not only get these brand new stories, but also exclusive PDF scripts and extended Extras downloads, as well as up to four Doctor Who - Subscriber Short Trips a year for free.

The main Doctor Who range continues next month with Sylvester McCoy, Sophie Aldred and Philip Olivier in Doctor Who - Shadow Planet / World Apart, the last of our recent three "double-bill" adventures:

And in July the Seventh Doctor discovers the High Price of Parking, with a brand new trailer unveiled today: