Release Message:  The Doctor (Matt Smith) 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.

Description:  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?