Department S (TV series) Department S (TV series) Department S is a British spy-fi adventure series, produced by ITC Entertainment. It consists of 28 episodes which originally aired in 1969 and 1970. It stars Peter Wyngarde as author Jason King (later featured in spin-off series "Jason King"), Joel Fabiani as Stewart Sullivan, and Rosemary Nicols as computer expert Annabelle Hurst. These three are agents for a fictional special department (the "S" of the title) of Interpol. The head of Department S is Sir Curtis Seretse (Dennis Alaba Peters). "When a case proves too baffling for the minds of Interpol, they turn to the talents
A Town Called Mercy looking to give each episode of the series a distinct feel, showrunner Steven Moffat pitched the Wild West theme to writer Toby Whithouse, suggesting that the episode could be about a town terrorised by a robot. Moffat was keen on putting Matt Smith in a Western setting, who he called one of the last people one would expect to replace Clint Eastwood. Whithouse had previously written the "Doctor Who" episodes "School Reunion" (2006), "The Vampires of Venice" (2010), and "The God Complex" (2011). Moffat had been planning for the first five episodes of the series to have "movie marquee" themes.