The whole of Discovery Series 2 has been leading to this: a baffling and possibly ill-advised decision to catapult the show 930 years into the future. (Spoiler: it turns out better than we could have dared to imagine.) On the way though, we get to experience breathtaking CGI, some vertiginous camerawork, and more heartfelt and prolonged emotion than the entire history of the franchise to date.