I kinda relegate this story, which is a great adventure of course, as being 'The Cybermen's Master Plan', in which there are slight parallels between this and what the Daleks were up to as well during the William Hartnell era. Even though, the Cybermen were only concerned with conquering Earth, not necessarily the entire universe. But with that aside, this is a truly gripping and awesome adventure, which also marks the return of Lethbridge-Stewart, this time a Brigadier, and placed in charge of UNIT, the United Nations Intelligence Taskforce. It was also great to see not just the Cybermen again, but the gentleman who portrayed Mavic Chen in the Daleks' Masterplan, portraying Tobias Vaughn, who is an equally dispicable, Chen-like villain this time around as well. And the scene where it is demonstrated how they would keep the Cybermen in line, but actually introducing emotions into their cybernetic systems is frightening. an extremely well done adventure, highly recommended.