In the quirky, sunlit world of Fort Chicken, Illinois, a bizarre outbreak begins with a chicken infected by a mutant virus that ends up as tainted nuggets. Those nuggets—presented as a harmless treat—find their way into the hands of unsuspecting kids, and one fourth-grader, Shelly Linker, becomes the first obvious vessel for the infection after sampling a black-dotted bite. The story follows this strange pathogen as it threads its way through the town’s school system, starting with Fort Chicken Elementary, where an aspiring horror writer, Clint Hadson, is asked to substitute for a day and to reconnect with his high school crush, Lucy McCormick, who is already dating the gym teacher, Wade Johnson. The juxtaposition of school life, budding romance, and a creeping contagion sets the tone for a tense, darkly comic survival tale that never loses its sense of place or character.
The ominous tension tightens in the classroom as chaos erupts. During a lesson, a student named Patriot is suddenly attacked by Shelly after he inadvertently yanks a pigtail from her scalp, and Clint himself is scratched in the ensuing scuffle as Shelly bolts away. Patriot’s injuries quickly become a microcosm of the larger crisis as he’s taken to the nurse’s office and his friend Dink confronts Shelly near the school’s perimeter. Shelly’s frenzied escape sets off a chain reaction that infects Dink, who then disperses the virus across the playground by scratching a wide swath of children. The spread is brutal and indiscriminate, sweeping through staff members in its wake—Mr. Pederson, Vice Principal Simms, and Sheriff Dave all fall victim to the feral outbreak. What begins as a chaotic incident inside a single school quickly reveals itself as something far broader and more troubling: the virus is transforming the infected, and the consequences stretch far beyond the doors of Fort Chicken Elementary.
Amid the pandemonium, Clint, Lucy, Wade, and the remaining staff—Doug Davis, Tracy Lacey, and Rebekkah Halverson—fight to survive as they retreat to the faculty lounge and then to the library for safety. An uninfected student named Calvin joins the group, and the sense of betrayal and confusion grows as Wade notes that Clint has been scratched. A quick diagnosis from Doug suggests that Clint’s symptoms resemble a stomach flu, arguing that adults are less susceptible than the children, while Calvin offers a more cryptic explanation: cooties are to blame. The team grapples with impossible odds as they barricade themselves in the music room, hoping to weather the day until help arrives.
Soon, the plan shifts from waiting to acting. The group intends to reach the roof when the day ends so they can call out to waiting parents for rescue, but the exhilaration of hope is tempered by the first arriving parent—paradoxically killed by her own infected child—forcing them back into the building. The tense moment is sharpened as Wade must shoot Dink when he follows them into the auditorium, a painful reminder that threat can come from within their own ranks. The survivors are joined by Tamra, a teenage girl who has also been scratched, complicating the safety calculus. Doug’s autopsy of Dink provides a grim conclusion: the infected kids are largely brain dead, and the virus appears to target those who have not yet reached puberty, which means Tamra may still be relatively safe. As Patriot’s power outage plunges the school into darkness and Calvin begins slipping into diabetic shock, the group finds a temporary lifeline in Mr. Hatachi, the janitor, who remains a calm anchor in a rapidly unraveling landscape.
A daring pocket of action follows: Clint is sent through the ventilation system to obtain a chocolate bar that can help revive Calvin, while the group also retrieves Wade’s truck keys and their cellphones. Lucy and Clint work their way back to the others, forced to contend with separation and danger as they navigate the labyrinth of corridors. In a moment of vulnerability, Lucy and Clint confess their feelings and share a kiss in the quiet of the library, a tender interlude amid the carnage. Wade calls Lucy on a walkie-talkie to apologize for his earlier behavior, and the group uses improvised weapons to fight their way back through the hallways and into the parking lot. The ever-present threat of infection weighs heavily as Mr. Hatachi is overwhelmed by the infected children, and Wade remains behind to ensure the others’ escape. The brutal climax of this sequence arrives when Patriot, concealed in the bed of Wade’s truck, leaps out to attack Clint and is ultimately crushed against a tree by the truck, a stark symbol of the brutalism of the outbreak.
With their escape route compromised, the survivors push toward the neighboring town of Danville, Fort Chicken’s rival, only to discover another town already overrun. The vehicle runs dry, and they take refuge inside a children’s entertainment complex, where they salvage a contaminated chicken nugget to study in the hope of developing a vaccine. The threat closes in again as the infected children close in on them inside a playroom. Wade and Hatachi, who have managed to survive in a second vehicle, arrive and help the group escape by sealing the children inside with a gigantic beach ball while Wade employs a water gun filled with gasoline to ignite a protective barrier and burn the building down. Their escape plan succeeds, and the survivors drive away from the town toward Antarctica, a bleak but hopeful refrain suggesting a destination “someplace kids don’t wanna go.” Shelly meets her end in the fiery pursuit, burning to death as the group escapes.
The story’s afterlife arrives in a post-credits moment, where Hatachi is seen at the school, reflecting in a moment of quiet as he finishes a story he had been telling the teachers. An alternate ending is hinted at as well: the surviving adults reach a campground only to be surrounded by the infected, their fates left unknown as the screen cuts to black. A later flashback sequence hints at the larger distribution of the tainted nuggets, showing deliveries to places such as an amusement park, an aquarium, and a family fun center, underscoring the virus’s reach beyond the school doors and across the country.
This tale blends dark humor with a bleak survival drama, using a seemingly silly premise to explore fear, resilience, and the uneasy line between childhood innocence and a world that can suddenly become terrifying. The cast of ordinary people thrust into extraordinary circumstances—teachers, administrators, students, and a few unflinching adults—navigate a rapidly collapsing system with courage, improvisation, and a stubborn will to protect one another, even as the virus mutates and the danger seems to stretch into the horizon.
