A Town Called Mercy

"A Town Called Mercy" is the third episode of the seventh series of the British science fiction television series Doctor Who, transmitted on BBC One in the United Kingdom on 15 September 2012. It was written by Toby Whithouse and directed by Saul Metzstein.

The episode featured alien time traveller the Doctor (Matt Smith) and his companions Amy Pond (Karen Gillan) and Rory Williams (Arthur Darvill) visiting the Wild West, where they encounter a town which is cut off from the rest of the frontier until they hand over Kahler-Jex, an alien doctor, to a cyborg called the Gunslinger. However, the Gunslinger is a product of experiments by Jex to win a civil war on his planet, and the Doctor is unsure of what is the right thing to do.

Showrunner Steven Moffat pitched the Wild West theme to Whithouse when thinking of ways to give each episode a distinct theme. Whithouse further developed the theme, including classic Western tropes and a sympathetic villain. "A Town Called Mercy" and the previous episode "Dinosaurs on a Spaceship" were the first to enter production for the seventh series. Much of the episode was filmed in March 2012 in the desert area of Almería, Spain, in Mini Hollywood and Fort Bravo, locations used for many Western-set films. Reviewers noted that the episode addressed a moral debate. "A Town Called Mercy" was watched by 8.42 million viewers in the UK. Critical reception was generally positive, with some critical of the Doctor's actions and pacing.