Something sinister is buried beneath London, and it could flatten the city, then plunge the entire human race into another Dark Age. When the Doctor begins to investigate, he learns some things he'd rather not know, concerning the universe, his own roots, and people he previously trusted. In the end, he, Martha, and Donna must learn how to contain the threat before it's too late!
Rated: T - English - Sci-Fi/Suspense - Chapters: 35 - Words: 108,857 - Reviews: 115 - Favs: 14 - Follows: 12 - Updated: 12/9/2018 - Published: 5/31/2018 - 10th Doctor, Donna N., Martha J. - Complete