Therefore, its known narrative elements are not a part of the Doctor Who universe as we, on this Wiki, choose to define it. It may have been the basis for a similar story in another medium, however — and that story may indeed be valid.
Earthstorm, by Stephen Baxter, was an unproduced audio story which was originally scheduled for release in late September 2007. It was due to be the 100th release in Big Finish's Main Range,  but was later replaced by the anthology release, 100.
- Earthstorm on the old Big Finish website via Web Archive.