By Heather S. Vina
Written by: Toby Whithouse
Recap: In a desert, a cyborg (Andrew Brooke) hunts down a man (Dominic Kemp) with a black, squiggly line on his face. Before his death at the hands of the cyborg, the man asks if he is the last one. The cyborg replies that there is one left: the Doctor.
The Doctor, Rory and Amy arrive at the town, Mercy. It’s a small town in the American West, set in the 1800s. …