A Good Man Goes to War
The episode reveals the recurring character River Song (Alex Kingston) is Amy and Rory's child. River's identity was kept in top secrecy, and only a few members of the cast and crew were issued the correct ending of the script. The beginning of the episode contained many different locations which were challenging for the production team. The main setting, Demons Run, was filmed in a military base and hangar in Cardiff. "A Good Man Goes to War" was watched by 7.57 million viewers in the United Kingdom and received an Appreciation Index of 88. Critical reception was generally positive, and the episode was nominated for the 2012 Hugo Award for Best Dramatic Presentation (Short Form).