Mercy, Nevada

Mercy was a town in Nevada. (PROSE: A History of Humankind) According to its residents, Mercy was a place of second chances.

In 1870, the town was in danger of starvation after the arrival of Kahler-Jex, who was being hunted by his cyborg Kahler-Tek for his crimes as a war criminal. Around its border, a circle of rocks and wood was placed so that no one could escape or enter. The Doctor became US Marshal of the town following the death of his predecessor.

After Jex blew himself up to atone for hurting Tek, the cyborg was convinced by the Doctor to become the next Marshall and protect the town; continuing into the 20th century as its protector, secret from outsiders. (TV:  A Town Called Mercy)

Behind the scenes

 * Although the script for  A Town Called Mercy never specifies that the town is in Nevada, set decoration heavily suggests that this is the case. Isaac's office, for instance, prominently features a reward poster issued by the office of the Governor of Nevada. The southernmost point of Nevada is also roughly two hundred miles from the Mexican border, as stated by Isaac. A History of Humankind later clarified that the town was indeed located in Nevada.