Glass is a 2019 American film, suspense and superhero, written, co-produced and directed by M. Night Shyamalan. It is the third and final part of what has been referred to as the Eastrail 177 trilogy, which includes Unbreakable (2000) and Split (2016). Bruce Willis and Samuel L. Jackson reprized their Unbreakable roles, while James McAvoy and Anya Taylor-Joy returned as their Split characters, with the addition of Sarah Paulson.
While there was an interest in creating a sequel to Unbreakable, Touchstone Pictures chose not to fund, despite the film's solid box-office performance. Shyamalan started writing Split using a character he had written for Unbreakable, but removed from the script due to balance issues. Shyamalan realized the opportunity he had to create a trilogy of works and adapted the ending of Split to establish the film within the narrative of Unbreakable. This included securing the rights to use the character in Disney's Willbreak, Unbreakable, with the promise of including them in the production and distribution of this third film, along with Universal Pictures, if done. Split was a financial and critical success, and in April 2017, Shyamalan announced that he had started the Glass production process.
After Split's completion, David Dunn pursues Kevin Wendell Crumb's superhuman persona in a series of encounters while Elijah Price's dark presence emerges as an orchestrator who keeps critical secrets from both men.
James McAvoy as Kevin Wendell Crumb / Fragmentado: A young man who suffers from dissociative identity disorder, who has 23 personalities and whose body chemistry changes with each personality, resulting in a personality 24 known as "the Beast".
Bruce Willis as David Dunn / Unbreakable A former college football prodigy transformed security with superhuman strength, endurance, invulnerability and an extrasensory ability to see the crimes that people have committed by touching them.
Samuel L. Jackson as Elijah Price / Mr. Glass: A mass murderer incarcerated and comic book theorist with Type I imperfect osteogenesis who was handed over to the authorities after Dunn discovered the extent of his crimes.
Anya Taylor-Joy as Casey Cooke: A young woman who was kidnapped by one of Kevin's personalities as a potential sacrifice for "The Beast", but managed to survive.
Sarah Paulson as Dr. Ellie Staple: A psychiatrist specializing in delusions of grandeur who treats patients convinced that they are superhuman.
Spencer Treat Clark as Joseph Dunn: David's son who believes in his father's abilities since he was a child, and sees him as a real life superhero.
Charlayne Woodard as Mrs. Price: Elijah's mother who took good care of her son and always said he was special, no matter what others said.
The cast included actors from both films: Bruce Willis, Samuel L. Jackson, Spencer Treat Clark, and Charlayne Woodard of Unbreakable and James McAvoy and Anya Taylor-Joy of Split, will reprise their respective roles on Glass. Sarah Paulson also joined the cast as a new character. In November 2017, Adam David Thompson joined the cast in an undisclosed role.
The main filming of the film began on October 2, 2017, in Philadelphia, after a week of rehearsals. Shyamalan planned a 39-day session in this period. On October 31, 2017, it was reported that Shyamalan was filming at Allentown State Hospital for the film and would be filming there for a few weeks.  On December 12, Shyamalan revealed that 4 scenes are being planned to be shot in January 2018, stating that he would have to travel through them. On February 16, 2018, a scene was filmed at Bryn Mawr College, at the athletic center. On July 12, 2018, the first official photos of the production were released, including photos of Samuel L. Jackson, Sarah Paulson and James McAvoy.