Directed by

Don Michael Paul
Made by

Universal 1440 Entertainment
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Read the complete plot summary and ending explained for Tremors: A Cold Day in Hell (2018). From turning points to emotional moments, uncover what really happened and why it matters.
In the remote plains of Nunavut Territory in Canada, a team of young researchers dedicated to collecting ice core samples from glaciers meet a sudden and tragic end when they are attacked and killed by a creature known as a Graboid. This mysterious and dangerous creature poses a serious threat to anyone venturing into the icy wilderness. Burt Gummer, played by Michael Gross](/actor/michael-gross), along with his son Travis Welker, is drawn into the situation after a seemingly routine encounter with a tax agent is brushed aside. They are approached by the knowledgeable Dr. Rita Sims and a young Graboid enthusiast, Valerie McKee, who request their assistance in investigating the unfolding chaos.
Their pursuit of the truth takes a perilous turn when their plane is suddenly attacked by an additional threat—the ferocious Ass-Blaster. Despite the chaos, Burt and Travis manage to reach a secured facility. Once inside, they uncover a troubling reality: the region’s unnaturally warm Arctic temperatures have created ideal conditions for Graboids to thrive and proliferate. This alarming development hints at an even darker secret, as Burt begins to suspect that the neighboring research groups, particularly those associated with DARPA, might be developing biological weapons using the Graboids’ unique biological properties.
As tensions rise, an Ass-Blaster makes a deadly attack on the facility, resulting in Burt heroically rescuing a researcher while suffering from a mysterious episode that causes him to collapse. It is revealed that Burt has been infected by a parasite injected by a Graboid years earlier, which is now threatening his life. The only hope for his recovery lies in extracting antibodies from a live Graboid, a task that becomes crucial as the creature continues to kill off the remaining researchers and staff.
The team faces life-threatening situations as they struggle to escape. Multiple members attempt to reach the generator area where the plane’s pilot, Mac, is working to repair their aircraft, while others aim to disable an automatic drill that has been activated and is causing further chaos. Meanwhile, Swackhammer, the facilities manager, devises a desperate plan to contain a Graboid using a makeshift underground electric fence, highlighting the group’s ingenuity under pressure.
Adding to the complexity, Agent Dalkwed from DARPA joins Burt’s team, revealing that his agency’s true interest was not only about studying the creatures but also about harvesting resources such as melted water, rather than developing bio-weapons. In exchange for their cooperation, the government agrees to clear Burt and Travis of tax liens, removing their financial burdens and granting them exemption from future property taxes. This agreement underscores Burt’s desire for independence and self-reliance, free from corporate and governmental interference.
The climax unfolds as the team engineers a daring trap, using a storage container to spear a Graboid and cut off its front tentacles. With a syringe, Travis carefully extracts venom from the creature’s internal gland, an act vital for saving Burt, who has been gravely affected by the Graboid parasite. Their efforts succeed, and with the threat neutralized, the team detonates the last remaining Graboid—their victory secured. Agent Cutts finalizes the paperwork, ensuring Burt and Travis are free from tax liabilities, before the team blows up the creature to prevent it from being exploited as a biological weapon.
Throughout this intense saga, themes of survival, scientific discovery, and corporate conspiracy intertwine, culminating in a gripping story of resilience against nature’s most formidable monsters. The film vividly captures the tension and danger of facing creatures born from nature and perhaps nurtured by human greed, leaving viewers on the edge of their seats with a blend of action, science, and suspense.
Follow the complete movie timeline of Tremors: A Cold Day in Hell (2018) with every major event in chronological order. Great for understanding complex plots and story progression.
Research team killed by a Graboid
In Canada's Nunavut Territory, a team of young researchers collecting ice core samples of glaciers is ambushed and killed by a Graboid, marking the beginning of the disaster. The attack highlights the dangerous presence of Graboids in the area caused by Arctic heat conditions. This event sets the stage for the subsequent hunt and emergency investigations.
Burt Gummer and Travis Welker are approached for help
After a run-in with a tax agent, Burt Gummer and his son Travis Welker are contacted by Dr. Rita Sims and young Graboid hunter Valerie McKee. They seek assistance in investigating the increasing threat of Graboids and related creatures in the Arctic. The duo discusses plans to explore the phenomena and help contain the outbreak.
Attack by an Ass-Blaster
Their plane is attacked by an Ass-Blaster, a flying variant of the Graboid, forcing Burt and Travis to make a desperate run to the research facility. Despite the attack, they manage to reach the site, where they begin their investigation into the creature threats. The attack underscores the escalating danger posed by the monsters.
Learn about Arctic heat and bio-engineering
At the facility, Burt learns that the Arctic's abnormal heat has made the region ideal for Graboids to thrive and spread. He suspects that nearby research at DARPA is developing bio-weapons using the creatures. The connection between the heat and the creatures' proliferation becomes a core concern for the team.
An Ass-Blaster attack injures Burt and reveals his infection
During an Ass-Blaster attack, Burt rescues a researcher but experiences an episode and collapses. It is revealed that he has been infected with a parasite derived from Graboid venom, which he contracted while inside a Graboid months earlier. This discovery prompts urgent efforts to find a cure.
Researchers attempt to escape and operate defenses
The team tries to escape the facility while others work to activate defenses. Some members head toward the generator to repair the plane, while Swackhamer creates an underground electric fence. Concurrently, others attempt to turn off an active automated drill, trying to halt the environmental disturbances facilitating the creatures.
DARPA agent joins the group and reveals intentions
Agent Cutts from DARPA joins Burt and his group, revealing that their original mission was to extract water rather than develop bio-weapons. He agrees to Burt's demand that the government remove tax liens from their property and grants them tax exemption. The group continues their fight for survival amidst internal and external pressures.
Trapping and extracting venom from a Graboid
The team uses a storage container to trap a Graboid, spearing it from the side to immobilize it, and cuts off its tentacles. Travis then inserts a syringe into the creature's mouth to draw venom from its internal gland sac. This venom becomes crucial for developing an antidote to Burt's infection.
Government grants property relief and they destroy the last Graboid
After securing the venom, Agent Cutts provides the paperwork removing the tax liens, effectively freeing Burt and Travis from financial burdens as they prepare to leave. The team then evacuates and blows up the remaining Graboid to prevent further threat, concluding their battle with the creatures.
Explore all characters from Tremors: A Cold Day in Hell (2018). Get detailed profiles with their roles, arcs, and key relationships explained.
Hart Hansen (Kiroshan Naidoo)
Hart Hansen is a resourceful researcher who likely supplies critical information about the ice core samples and the environment. He is probably cautious and perceptive, dealing with the harsh Arctic environment while trying to survive the Graboids' attacks.
Aklark (Keeno Lee Hector)
Aklark is probably a key member of the research team or a local guide. He appears to be brave and dependable, assisting in the fight against the creatures amidst the icy wilderness.
Valerie McKee (Jamie-Lee Money)
Valerie McKee is a young Graboid hunter and researcher, eager and determined. She likely exhibits bravery and a quick thinking nature, crucial in the fight for survival against the Graboids.
Dr. Rita Sims (Tanya van Graan)
Dr. Rita Sims is a scientist focused on understanding and combating the Graboids. She displays intelligence and dedication, driving the research efforts and aiding in saving the group from the threats.
Learn where and when Tremors: A Cold Day in Hell (2018) takes place. Explore the film’s settings, era, and how they shape the narrative.
Time period
Contemporary
The movie is set in the present day, during a period of unusual Arctic heat temperatures that have made the region more accessible and susceptible to unusual wildlife activity. The events unfold in a time when scientific research and military interests intersect amidst environmental changes, highlighting modern concerns about climate and bioweapons.
Location
Canada's Nunavut Territory
Nunavut is a vast, sparsely populated region in northern Canada known for its Arctic climate and expansive glaciers. It features rugged terrain, ice-covered landscapes, and unique ecosystems that are exposed to extreme weather conditions. The area is a remote, pristine environment that becomes a dangerous battleground in the movie.
Discover the main themes in Tremors: A Cold Day in Hell (2018). Analyze the deeper meanings, emotional layers, and social commentary behind the film.
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Bio-Weapons
The movie explores the dangers of developing bio-weapons and the ethical implications of genetic manipulation. It depicts how military research can backfire when creatures like Graboids are exploited as weapons, leading to catastrophic consequences. The story emphasizes the importance of responsibility in scientific innovation.
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Environmental Change
The Arctic heat and melting glaciers serve as a backdrop for themes of environmental instability and human interference with nature. These changes facilitate the dangerous resurgence of Graboids and highlight the impact of climate shifts on local ecosystems and scientific exploration strategies.

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Discover the spoiler-free summary of Tremors: A Cold Day in Hell (2018). Get a concise overview without any spoilers.
In the frozen reaches of Canada’s Nunavut Territory, a remote research outpost sits amid endless white, its purpose cloaked in secrecy. Beneath the ice‑capped landscape, something far larger than the terrain itself stirs: enormous subterranean worms that have become the unlikely focus of a covert operation. The stark, wind‑howled environment adds a relentless pressure, turning every breath into a reminder that nature here is as unforgiving as it is mysterious.
Burt Gummer arrives with his son Travis Welker, both seasoned by countless brushes with the series’ iconic monsters. Burt brings his trademark blend of lethal ingenuity and off‑beat humor, while Travis balances his father’s swagger with a pragmatic curiosity that keeps the pair grounded. They are soon joined by Dr. Rita Sims, a pragmatic scientist whose knowledge of the creatures borders on obsession, and Valerie McKee, an eager enthusiast whose fascination hints at deeper layers of intrigue. Together they form an uneasy alliance, each driven by personal stakes and a shared instinct to survive the unseen threat lurking beneath the snow.
The film’s tone walks a tightrope between gritty survival thriller and the franchise’s signature tongue‑in‑cheek excitement. As the team uncovers the unsettling possibility that the worms are being weaponized, a race against time begins: they must find a way to neutralize the danger without falling prey to it. The tension is palpable, the Arctic’s icy silence broken only by the rumble of something massive below, promising a showdown where ingenuity, family bonds, and a dash of dark humor may prove just as vital as firepower.
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