Glass is a 2019 superhero film written and directed by M. Night Shyamalan, who also produced with Jason Blum, Marc Bienstock, and Ashwin Rajan. The film is a crossover and sequel to Shyamalan's previous films Unbreakable (2000) and Split (2016) and the third and final installment in the Unbreakable trilogy.

More than 20,000 people attempted to boycott the film, claiming that it promoted negative stereotypes and provided false connections between mental illness and violence (Davidson, 2017). the lack of acknowledgment of DID in both the public and medical spheres, resulting in insufficient training and research.

Night Shyamalan's Split drew inspiration from the real life court case of Billy Milligan. Milligan's landmark verdict of not guilty based on Dissociative Identity Disorder still captures public interest today. Shyamalan's portrayal of DID in Split is based on Milligan's case but takes many creative liberties.

The camera then tracks over to reveal Bruce Willis, reprising his role of David Dunn (evidenced by his nametag), who dryly confirms the old villain's identity as Mr. Glass and walks out. It's a plot twist that reveals the characters of Split and Unbreakable have been in the same world all along.