Doctor Who. Sting of the Zygons: Stephen Cole

The TARDIS lands the Doctor and Martha in the Lake District in 1909, where a small village has been terrorised by a giant, scaly monster. The search is on for the elusive `Beast of Westmorland', and explorers, naturalists and hunters from across the country are descending on the fells. King Edward VII himself is on his way to join the search, with a knighthood for whoever finds the Beast.
But there is a more sinister presence at work in the Lakes than a mere monster on the rampage, and the Doctor is soon embroiled in the plans of an old and terrifying enemy. And as the hunters become the hunted, a desperate battle of wits begins - with the future of the entire world at stake...
An adventure featuring the Tenth Doctor, as played by David Tennant, and his companion Martha