It's pretty much a given that Hulk will play a big part in bringing Ultron to his knees, but at the same time he's also overwhelmingly unpredictable, hence why Iron Man has to don the Hulkbuster armour at one point in the movie to calm him down. Still, considering that Hulk isn't getting his own movie any time soon, and Infinity War Part 1 won't come out for another three years, many are speculating where the movie will leave the big green dude when it's all said and done. The Likely Answer: There's a fantastic and surprisingly plausible rumour that Age Of Ultron may end with Hulk being shot into space for one reason or another, at which point he'd meet up with the Guardians Of The Galaxy in their second movie in 2017. It'd be a clever way to give Hulk another movie ahead of Infinity War without risking over-exposure, as he can simply be a supporting character in that film. On the other hand, maybe he'll just turn back into Banner and merely "exist" until 2018, which would be a bit of a shame (but hey, that's what happened at the end of The Avengers, so it's not the end of the world).