Following the events of 'Split', 'Glass' opens with security guard David Dunn (Bruce Willis) and his now adult son, Joseph, tracking Kevin Wendell Crumb (James McAvoy), a mentally disturbed man with twenty-four alternate personalities. Crumb has kidnapped a cheerleading squad with the intention to feed them to the superhuman Beast, perhaps the most dangerous of all the personalities dwelling within Crumb's psyche. Dunn, however, now accepting of his superhuman alterego known as 'The Overseer', is ready to fight to save these young women and any future victims of Crumb. Dunn's past threatens to make this job all the more difficult when Elijah Price (Samuel L. Jackson) comes back onto the scene.

Psychiatrist Dr. Ellie Staple (Sarah Paulson) is convinced that both men are not superhuman, but rather are deluded into believing in their own supernatural beings, and is granted a three day deadline to prove her theory.

'Glass' is the last instalment in the trilogy, following M. Night Shyamalan's 'Unbreakable' and 'Split'.

Written and directed by Shyamalan and starring Bruce Willis, James McAvoy, Samuel L. Jackson, Spencer Treat Clark, Anna Taylor-Joy and Sarah-Paulson, 'Glass' brings the acclaimed sci-fi thriller franchise to a close.