David is a commercial artist living in Bridgton, Maine. He cares deeply for his family and consciously abandoned loftier artistic aspirations to reliably provide for his wife and son. Grounded, practical, and fiercely protective, he naturally assumes a leadership role when a mysterious mist traps a group of shoppers inside the local supermarket. He struggles to keep his five-year-old son safe while trying to maintain order among the terrified survivors.

Mrs. Carmody is the eccentric owner of a Bridgton antique store, initially dismissed by locals as a harmless purveyor of strange folk remedies. As unexplainable horrors escalate outside, she seizes the information vacuum inside the store to preach an apocalyptic sermon. Her intense religious fanaticism slowly draws desperate followers to her terrifying cause.

Brent is a wealthy out-of-towner who owns property neighboring the Draytons. Following the recent death of his wife, he feels isolated and resentful, fully embracing his status as an outsider in Bridgton. He is fundamentally unwilling to trust others and dismisses early warnings of danger as an elaborate local prank aimed at humiliating him.

Ollie is a mild-mannered supermarket employee who treads a difficult line between overwhelming terror and practical responsibility. Though his initial instinct is to numb his fear with alcohol, he proves to be level-headed and capable. As a trained marksman, he reluctantly accepts the burden of defending the group.

Amanda is a young woman visiting Bridgton for the summer, caught in the supermarket without her overprotective husband. Despite her vulnerability and status as an outsider, she proves resilient and fiercely protective of the children in the store. She bonds with David as they seek mutual comfort in a terrifying situation.

Steff is David's wife, a resident of the Long Lake area who stays behind to clean up the storm damage while her husband runs errands. She is knowledgeable about local Bridgton folklore. Her absence casts a heavy shadow over David's actions throughout the crisis.

Billy is David and Steff's five-year-old son. Innocent and highly sensitive to the shifting moods of the adults around him, his profound terror forces David to maintain a strong, protective facade during the supermarket siege.

Norm is a young, eager teenage bag boy working at the Bridgton supermarket. He is naive to the true danger hiding in the mist and simply wants to prove himself helpful to the older men attempting to restore the generator's power.

Mrs. Turman is a middle-aged woman from the Bridgton area who occasionally babysits for the Drayton family. She provides a sense of normalcy and childcare amidst the escalating chaos inside the building.

Hilda is an elderly, middle-aged schoolteacher trapped in the supermarket. She proves to be remarkably tough, practical, and unshakeable in the face of the bizarre creatures attacking the building.

Jim is a local Bridgton working-class man who views out-of-towners with heavy suspicion. He struggles to cope with the reality of the mist, oscillating between arrogant denial, accusations against David, and heavy alcohol consumption.

Myron is a local Bridgton man trapped in the store. Like Jim, he relies on beer to suppress his terror of the unknown, but his profound fear eventually makes him susceptible to Mrs. Carmody's dark influence.

Bud is the manager of the Bridgton supermarket. He is initially obsessed with store policy and shoplifting, struggling to adapt his bureaucratic mindset to the apocalyptic reality unfolding outside his doors.

Dan is a practical man trapped in the supermarket who recognizes the escalating danger posed by both the monsters outside and Mrs. Carmody's growing cult inside. He takes the initiative to test the mist's boundaries.