In the Victorian-inspired town of Cheesebridge, obsession with wealth, status, and stinky cheese reigns supreme. Beneath the cobblestone streets dwell the Boxtrolls, gentle, industrious creatures named after the cardboard containers they wear as clothing. Human society views these subterranean dwellers as monstrous baby-snatchers, a vicious myth perpetuated by the ambitious and sociopathic Archibald Snatcher. Snatcher desperately covets a coveted White Hat—the symbol of the town's ruling elite, the Trubshaw Council—and strikes a dark bargain: if he exterminates every last Boxtroll, the Lord Portley-Rind will grant him this supreme aristocratic status, despite Snatcher’s debilitating and ironic cheese allergy, which causes his face to swell hideously whenever he consumes dairy.Unknown to the citizens, the Boxtrolls are actually peaceful scavengers who lovingly raised a human infant left behind in the ruins of a workshop. Named Eggs after the crate he wears, the young boy grows up believing he is one of them, taught to build mechanical contraptions by his
surrogate father, Fish. However, one by one, the Boxtrolls are hunted down and abducted by Snatcher and his brutal henchmen, Mr. Trout, Mr. Pickles, and Mr. Gristle.Desperate to rescue his captured family, Eggs ventures above ground. There, he crosses paths with Winnie Portley-Rind, the neglected, macabre-loving daughter of Lord Portley-Rind. Initially repulsed by the feral boy, Winnie soon realizes the truth about the Boxtrolls and helps Eggs navigate human society. They discover that the abducted Boxtrolls are not being killed, but are instead forced to build complex machinery for Snatcher in his hidden lair. Driven by a twisted sense of entitlement, Snatcher plans to detonate the Boxtroll caverns, completely erasing them and framing the event to solidify his own heroic legacy.Eggs allows himself to be captured to reunite with Fish and his other fathers. Inside the lair, they use their mechanical ingenuity to engineer a daring escape. Meanwhile, Winnie exposes Snatcher’s duplicity to her father and the town council, revealing the horrifying reality of his plot. Confronted in the town square, a desperate Snatcher eats a wheel of the legendary Brie, causing his throat to close. Eggs reveals his true identity as a human, shattering Snatcher's grip on the crowd's prejudice. Defeated, humiliated, and physically bloated from his allergy, Snatcher attempts to snatch Winnie one last time in a hot air balloon, but a newly freed Fish sabotages the vessel. The balloon crashes, and Snatcher is seemingly crushed by his precious White Hat, which falls from the sky and flattens him. With the town's prejudices shattered, Cheesebridge embraces its subterranean neighbors, and Eggs, finally understanding who he is, chooses to stay with his true family in the tunnels below, living a life of peace, invention, and
unconditional love.