A Town Called Mercy

Name: A Town Called Mercy
Director: Saul Metzstein
Released: 2012-09-15
Duration: 45 min
Rating: 6.9
Cast: Arthur Darvill, Ben Browder, Adrian Scarborough, Dominic Kemp, Garrick Hagon

S7 E3 September 15, 2012 0h 45m ★ 6.9

Source:

Overview

The Doctor gets a Stetson (and a gun!), and finds himself the reluctant Sheriff of a Western town under siege by a relentless cyborg, who goes by the name of the Gunslinger. But who is he and what does he want? The answer seems to lie with the mysterious, Kahler-Jex, an alien doctor (yes another one!) whose initial appearance is hiding a dark secret.