Boo

A spiritually aware young woman who senses ghosts and channels their presence. She becomes the group’s guide through the hospital and shares her late mother’s haunting call every Halloween. Jessie uses her wits to outmaneuver Jacob and ultimately impersonates Nurse Russell to scare him away.

Jealous and impulsive, he cheats on Jessie and grows paranoid as the haunting escalates. He ends up shooting Marie in a moment of fear, and his later fate ties into Jacob’s possession.

A friend who becomes entangled in the hospital’s horror and is killed, then reanimated. His death accelerates the group’s plan to escape and raises the stakes for everyone.

A friend of the group who becomes a target of the spectral danger. She is shot by Kevin in a moment of panic and later revealed to be a moving presence among the reanimated.

A friend preparing Halloween props who is attacked by a ghost, dies, and is later reanimated along with others. His fate underscores the hospital’s threat and the peril the group faces.

Allan’s missing sister, who is found alive only to reveal she has died and been reanimated. She is later possessed by Nurse Russell during the climax, aiding the group to survive.

A determined survivor who searches for Meg and fights his way through the haunted hospital. He uses his wits and a gun to defend the group and push toward a solution.

A child-murderer who haunts the hospital, killing and reanimating people to possess them. He remains a relentless and manipulative adversary throughout the night.

The hospital nurse who becomes the vessel for Russell and ultimately confronts Jacob. She embodies strategy and control, guiding the living to safety.

A former actor-turned-cop who trails Allan and helps exploit the hospital’s weaknesses. He plays a decisive role in subduing reanimated enemies and aiding the escape.

Meg’s missing friend who was part of the earlier disappearance. She appears in the hospital’s memory and is tied to Jacob’s murderous past.

Emmett’s dog who accompanies the group through the hospital. The animal is killed during the hauntings and briefly joins the danger of the reanimated.

A spectral child-figure encountered on the third floor whose presence foreshadows the killer’s reach. Her appearances heighten the supernatural mood and danger.

A little girl spirit tied to the hospital’s dark past. Her ghostly presence underscores the history of violence that keeps resurfacing.