We finally know who Sadie Sink is playing in Spider-Man: Brand New Day. Watch trailerThe Brand New Day press tour has been a masterclass from both Sadie Sink and Marvel/Sony in how to build hype around a film's central mystery. The most popular of which is that Sink is playing a new version of the X-Men character Jean Grey. Spider-Man: Brand New Day is out in cinemas and we finally know who Sadie Sink is playing. But beware, if you haven’t seen Spider-Man: Brand New Day, turn back now…Who does Sadie Sink play in Spider-Man: Brand New Day?