About Doctor Who Season 7, Episode 3 : A Town Called Mercy

The Doctor and the Ponds arrive in a unsettling western town under siege from a merciless cyborg. Thrust into the role of sheriff, the Doctor attempts to solve the riddle behind the ruthless "Gunslinger" but it is not long before he is thrown into a sense-shattering showdown. Guest Stars: Karen Gillan, Arthur Darvill, Ben Browder, Adrian Scarborough, Dominic Kemp, Garrick Hagon, Andrew Brooke, Joanne McQuinn, William Byrd Wilkins, Sean Benedict,