From sleeper hit to summer blockbuster? That's what it seems with the latest news coming from the set of Avengers: Infinity War. Notoriously secretive, Marvel Studios is keeping things under wraps. But the film's directors, the Russo brothers, are giving fans a behind-the-scenes look at something unexpected. No, the directing duo didn't reveal what's happening with Captain America or Star-Lord, they shared an image of Millie Bobby Brown joining them on set.