Summary: An episode from the science fiction thriller produced by the BBC. A fateful landing on Earth in the 26th Century finds Doctor Who and the TARDIS deep within a system of subterranean caves and even deeper within the mystery surrounding the brutal murder of a group of geologists working there.

Format: moving image

Publisher / Publication Date: BBC Video 2004

Copies Available at Woodmere

1 available in British Television Series DVDs, Call number: DVD BRITISH TV DOC