David Dunn is the sole survivor of a horrific train-crash that killed 131 people. An obscure character approaches Dunn as he thinks he has something extraordinary about him.
As three teenage girls fall victim to the machinations of a man with dissociative identity disorder, they have to do their best to navigate their interactions with his 23 personalities as a new nefarious personality starts to emerge.
Security guard David Dunn uses his supernatural abilities to track Kevin Wendell Crumb, a disturbed man who has twenty-four personalities. They both meet Mr. Glass who's masterminding a grand plan.