Jason King (TV series) the X-Men comics, the character of Jason Wyngarde (aka Mastermind) was partially inspired by Jason King and Peter Wyngarde. Mastermind had first appeared in the 1960s, but took on the appearance and identity of Jason Wyngarde in the build-up to the X-Men's first confrontation with the Hellfire Club in the late 1970s. Wyngarde had played the leader of another Hellfire club in "A Touch of Brimstone", an episode of the popular TV series "The Avengers", in which Diana Rigg appeared in a leather costume that Jean Grey adopted as the Hellfire Club's Black Queen. He is also one of the
A Town Called Mercy 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