The phrase "game-changing" is one that's thrown about wily nilly in the Whoniverse these days. Game-changing cliffhangers, game-changing character developments... Hell, even the Doctor changing his jacket is cited as game-changing these days (in fact, there's an entire Tumblr page dedicated to it). But how many of these events actually do "change the game", as it were? Usually it's just a word casually dropped into interviews to add a sense of *drama* and it's extremely rare that events turn out to be as Earth-shatteringly climactic as the preceding press releases would have you believe. Is Series 9 about to change that? As filming on the Twelfth Doctor's second string of universal escapades continues, Steven Moffat has recently revealed that the upcoming episodes will change everything fans think they know about Doctor Who. It's been back on our screen for 10 years now so it's about time they shook things up a bit, but what changes lie in wait for everybody's favourite Time Lord and his returning companion, Clara Oswald? Well, your guess is as good as ours for the time being, but here are 8 genuinely game-changing things that have already been unearthed about Series 9 thus far. Suffice to say, autumn can't get here quick enough.