Doctor Who - The Fourth Doctor Adventures: Subterreanea, starring Tom Baker and Lalla Ward, written by Jonathan Morris and directed by Nicholas Briggs, finds the Doctor and Romana battling an evil force under the planet’s surface.

The TARDIS is going underground. When the Doctor and Romana find themselves buried beneath the surface of an alien world, they're soon swallowed up by a giant burrowing machine. This is where the inhabitants of this planet live - in huge, constantly moving, Drill-towns, chewing up the fuel and resources of the planet in order to survive.

But something else lurks in the earth. Something that feeds on the Drill-towns. Something that is relentless and will not stop.

The Silex are hunting.

You can pick up this range for £10.99 on CD or £8.99 on download, or save money and get free UK postage with a subscription. A subscription for the Sixth Series with the Doctor and Romana is £75 on CD and £65 on Download. If you’ve loved travelling with Tom and Lalla, you can pre-order Series Seven with Louise Jameson and Tom Baker or Series Eight with the Doctor and new companion Ann Kelso, played by Jane Slavin, for just £45 on CD and £40 download. That’s a saving of over 50%! There’s also a range of bundles to pick up previous series.

And in July, keep an eye out for the next Fourth Doctor adventure, The Movellan Grave.

And we can now reveal the trailer for Doctor Who - The Fourth Doctor Adventures: The Skin of the Sleek, out in August!