 The episode was written by head writer Neil Cross . It was also additionally written by Ben Richards . The plot of the episode was influenced by the resurgence of power in Russia following the end of the Cold War , which the producers felt in subtle ways is threatening the security of the West . The producers also included scenes that would show Lucas adjusting to the outside world following eight years of imprisonment , to show how emotionally damaged the character is , and make the audience realise he is struggling . One of the scenes include Lucas struggling to sleep on a bed , and soon resorts to lying on the floor instead . 
