“A Town Called Mercy” (07.03, 2012) Written by Toby Whithouse (Past Episodes: “School Reunion,” “The Vampires of Venice,” “The God Complex”) Directed by Saul Metzstein (Past Episodes: “Dinosaurs on a Spaceship”) Toby Whithouse has been one of the stronger writers on the series, showcasing a remarkable ability to design fascinating monsters and a strong grasp…