 | Starring: | Tom Baker & Lalla Ward | | | By: | Jonathan Morris | | | Rating: |   8.8 (4 votes) Vote here | | | Review: | Into the bowels of the Alien Planet Read more (1 in total) | | | Released: | June 2017 (Big Finish website only)
July 2017 (wide release)
| | | Publisher: | Big Finish | | | ISBN: | 978-1-78178-719-9 | | | Format: | 1 x CD | | | Owned: | | | | Buy: |  |  | (Not currently available) |
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Cover blurb:
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. | 
