Struggling inventor Randall Peltzer travels to a Chinatown antique shop in search of a memorable Christmas gift for his son, Billy. There, he encounters a small, endearing creature—the mogwai—whose soft fur and curious eyes hint at a gentleness that could warm even the chilliest December. The shop owner, Mr. Wing, keeps the mogwai hidden away in a quiet corner, unwilling to part with it, but his grandson secretly sells it to Randall. Before the deal is sealed, he issues a clear warning and hands over three simple, but strict, rules for the creature’s care: keep it away from light, especially sunlight, which will kill it; never let it come into contact with water; and most importantly, never feed it after midnight. The gravity of these rules hangs in the air as the mogwai passes into Randall’s hands, carrying with it the promise of something extraordinary—and potentially dangerous.
Back in Kingston Falls, Billy works at the local bank and looks out for his father’s new companion, while also contending with worries over his beloved dog Barney and the looming threat of Ruby Deagle, a widow whose greed seems as cold as the winter wind. The moment Gizmo—the mogwai Randall brings home—arrives, the household warmth and wonder of the season are restored. Gizmo proves to be a gentle, almost magical little creature: calm, affectionate, and endlessly curious about the human world around him. The rules are easy to follow in this quiet, domestic setting, and Gizmo forms a gentle bond with Billy, who treats him with care and patience.
Trouble begins when a careless spill of water from Billy’s friend Pete Fountaine accidentally drenches Gizmo. In an instant, the mogwai gives birth to five new, more mischievous little beings, each with their own personality but all bound to Gizmo by a shared, cheeky energy. The first to catch Billy’s eye is Stripe, a bold mogwai distinguished by his white fur and a striking mohawk—a creature who radiates danger as soon as he opens his eyes. This sudden proliferation shifts the mood from cozy happiness to brittle tension, as the once-harmless Gizmo becomes overshadowed by a chaotic, rapidly expanding threat.
Things worsen when a science teacher, Roy Hanson, who once had a soft spot for fascination with the mogwai, experiments with one of the more aggressive offspring. The consequences are swift and brutal: Hanson’s mogwai cocoons, and soon afterward, the hatchlings emerge as reptilian gremlins with a taste for mischief that quickly turns violent. The calm of the Peltzer home shatters as the gremlins torment Gizmo, and violence erupts when they attack Billy’s mother, Lynn, and threaten the family in increasingly dangerous ways. The city’s nerves tighten as the gremlins grow bolder, their antics becoming deadly as they turn on anyone who gets in their path.
As the gremlins descend into their rampage, the local police find themselves overwhelmed by the unpredictable and destructive chaos that follows. The story widens to show the broader impact of this strange menace: suspicions rise, townspeople become anxious, and the very fabric of everyday life—the bank, the bar where Kate Beringer works, the movie theater, and even the quiet streets—begins to crumble under the gremlins’ relentless mischief. Billy, forced to become a protector rather than a boy under the tree, fights to keep those around him safe, especially when the gremlins crash through ordinary spaces with extraordinary mayhem.
One subplot adds a poignant layer to the holiday season: Kate Beringer reveals that her father vanished on Christmas Eve years earlier and was later found dead in their home’s chimney, a tragedy that left her with deep-seated trauma about the holidays. This confession adds a human sorrow to the chaos and helps explain Kate’s guarded posture around the festive period, even as she and Billy form a bond in the face of danger. The group—Billy, Gizmo, and Kate—find themselves cornered by the gremlins in a rapidly darkening town, seeking refuge wherever they can, while Stripe and the others continue their spree with increasing audacity.
With morning approaching, the trio tracks the gremlins to a movie theater, where they gather in a dangerous cluster and a plan seems almost within reach to end the threat. They trigger a gas explosion that wipes out nearly all the creatures, but Stripe—who had slipped away to the Montgomery Ward store in search of more fuel for his sinister schemes—survives and remains a stubborn symbol of the danger that still lingers. Gizmo, ever the beacon of hope and restraint, manages to confront Stripe by unleashing light—opening a skylight and allowing a stream of sunlight to fall upon Stripe, which proves fatal to the rogue mogwai. The moment brings a sobering sense of relief to Kingston Falls, as the immediate danger subsides and the town begins to recover from its near-destruction.
As news outlets begin to report on what happened, Mr. Wing arrives at the Peltzer home to reclaim Gizmo, rebuking the family for their negligence and offering a sharp critique of Western society’s careless approach to nature. Yet, in a final, tender gesture that carries both forgiveness and a glimmer of hope, Gizmo—now connected to Billy through the shared trust and care they’ve built—bids farewell to Mr. Wing. The elder mogwai trader departs with a reminder that true responsibility is earned, not inherited, and his parting words hint at a future where Billy might be ready to care for Gizmo in a more complete, thoughtful way.
In the end, the film folds its chaos back into a quiet winter night, leaving viewers with a blend of festive sentiment and a cautionary note about the consequences of neglecting the boundaries set by nature. The story lingers on the idea that wonder can coexist with danger, and that friendship—between a boy and a creature who is at once adorable and perilous—has the power to temper fear, bring people together, and stretch the possibilities of a hopeful Christmas.
