Speculative fiction is a broad umbrella category of narrative fiction referring to any fiction story that includes elements, settings and characters whose features are created out of imagination and speculation rather than based on attested reality and everyday life. That encompasses the genres of science fiction, fantasy, science fantasy, horror, alternative history, and magic realism.
The Doctor takes his new companion, Grant, back home to Agora only to
find a world in the thrall of old and deadly foes. The Cybermen have
taken control and set up a breeding colony to propagate their own race.