After pursuing Kevin Wendell Crumb and the multiple identities that reside within, David Dunn finds himself locked in a mental hospital alongside his archenemy, Elijah Price. The trio must now contend with a psychiatrist, who is out to prove they do not actually possess superhuman abilities.

Two children are sent to their grandparents house to spend a week with their grandparents while their single mom goes on a relaxing vacation with her boyfriend. One of the kids, Becca, decides to film a documentary about her grandparents in order to help her mom reconnect with her parents and also find out some things about her parents as well. While filming the documentary, however, Becca and her little brother, Tyler, discover a dark secret about their grandparents.