Unknown to UNIT, Winters and Jellicoe have instructed K1 to kill Cabinet Minister Joseph Chambers as "an enemy of humanity", and to use the completed disintegrator gun to steal papers from his personal safe. UNIT discovers this death, and the Brigadier explains the importance of Chambers; the stolen papers were launch codes for the nuclear weapons of the major nations, given voluntarily to Britain as a neutral entity to only be released in time of great need. Further, Winters, Jellicoe, and others at Think Tank are discovered to be members of the Scientific Reform Society, seeking to put scientists in charge of the world believing they can make better decisions for humanity than the current governments. Learning of an SRS meeting that night, UNIT prepares to move out, while Sarah, after discovering Kettlewell is also a member, convinces him to go to the meeting to allow her to sneak into it.