on april 25, 2018, the film was featured at cinemacon, with shyamalan in attendance. he presented footage from the film, along with the first official image, featuring willis, jackson, and mcavoy in character. he also expressed his intention for the film, saying, "the worlds of "unbreakable" and "split" finally collide in "glass". what if these real life superheroes and super-villains are somehow locked up together? what could go wrong?" despite being preceded by hyper-realistic films about superheroes and villains, like "the dark knight", shyamalan personally considered "glass" to be the "first truly grounded comic book movie".