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.
A deranged version of the Doctor has broken through a rip in reality and
is travelling the universe dispensing his own kind of justice. Only
the real Doctor knows himself well enough to deal with this threat.