on a day far from being bright for Earth creatures emerged from its depths people called them Reapers and they quickly destroyed 99% of the planet's population for reasons unknown the Reapers don't attack humans at altitudes above 8,000 ft which allowed a small portion of the population in certain countries to survive in America the safe zones turned out to be the Rocky Mountains in Colorado here in the settlement of lost Gulch Refuge lives a boy named Hunter one day he ventured Beyond a boundary marked by a blue line on the ground and narrow escaped a Reaper
hunting below the safe threshold Hunter's father will scolds his son for taking such a risk will is particularly worried because Hunter has a lung condition that prevents him from running and after the death of his wife Tara Hunter is the only family he has left later will tells his neighbor Katie that Hunter only wanted to see the neighboring settlement Katie feels sorry for the boy there are no other children in their Village for him to be friend and most of all he misses his mother terribly meanwhile in the yard next door a woman named nah
is unsuccessfully trying to find a way to kill Reapers she tests various Alloys by crafting bullets and firing them at a piece of Reaper armor will remains skeptical of Nina's experiments often reminiscing about Tara who left with nah On A Dangerous Mission to procure essential chemicals and perished in the jaws of a Reaper that night Hunter suffers another attack will manages to stabilize him but he realizes that their stock of necessary medication is nearly depleted the next day will buys macaroni at the local shop a food item now worth a fortune despite the cost it's
Hunter's birthday and macaroni is his favorite dish Hunter however is curious why his father no longer uses the radio will explains that electricity has become a scarce resource and must be reserved for hunter's life support machine will also mentions that the filters for the machine are running low to replace them he must travel to the nearest town located below the safe altitude later Katie who was tera's close friend visits will she reminds him that it's Friday and they reminisce about how weekends used to be before The Invasion their conversation is interrupted by a gunshot from
Nina's yard as she tests another bullet they exchange glances surprised at her persistence that night Hunter's condition worsens again will gives him an injection and barely manages to relieve the symptoms the following day will approaches nah and announces that he plans to head to the town tomorrow claiming he knows a safe road nah insists there's no such thing will explains that the filters in Hunter's device are almost gone leaving him no choice but to retrieve Replacements from a hospital nah warns that the journey requires descending through passes patrolled by Reapers will then Reveals His secret
he plans to use an abandoned mine that cuts through the mountain to reach the town Nina reminds him that the Reapers originated from underground and that mines are their natural habitat however will insists he knows the mine well and the distance to travel is relatively short he sets a meeting time for tomorrow though nah firmly declares she won't be joining him after will leaves nah spends a long time staring at at a pirate flag Banner she had vowed to raise over the mountains once she discovered a way to fight the rapers the next morning will
visits the local gunsmith who provides him with a rifle and grenades although the weapons aren't particularly effective against the Predators they can at least slow them down the gunsmith shares his personal supplies and wishes will good luck Katie arrives upset that will hadn't told her about his plans despite his objections she arms herself and declares that she's going with him nah greets Katie with hostility insisting that she's unprepared to face the Reapers having never even seen one up close Nina predicts certain death for the group will explains his plan once they reach a ski slope
they'll use a lift to descend to the mine entrance he hopes the equipment is intact and that he'll be able to get it working the group sets off in response to questions nah reveals that she hopes to reach her lab where she knows the specific chemical she needs to continue her work nah also brings two of her inventions a compass and a device that can detect Reapers near by by picking up their High bioelectromagnetic impulses far stronger than those of any creature on earth soon they reach a fire Road about a mile from the ski
slope however this marks the end of the safe Zone the group crosses the boundary and moves cautiously weapons at the ready they come across several wrecked Vehicles Scavenging supplies and weapons from them Katie takes a grenade launcher displaying her Texan upbringing and skill with such equipment meanwhile nah discovers a fragment of Reaper scale as she retrieves it a heated argument erupts between her and Katie Katie blames nah for tera's death while nah dismisses Katie as an inexperienced nuisance will intervenes breaking up the fight and the group continues toward the abandoned ski area suddenly a distant
Winnie Echoes from the woods surprising the group with the sight of wild horses now roaming freely in the mountains before long they arrive at the ski resort the summit and safety are within reach however Nina warns that reaching the top is impossible as a Reaper is already nearby will and Nina rushed to the backup generators attempting to power the lift while Katie stands guard with a grenade launcher she waits for the creature to appear from the forest but sees no sign of it finally the Beast emerges from the tree line Katie fires but the grenade
misses the agile monster the reaper charges toward her as will manages to activate the lift hean Nina leap into the gondola which begins its Ascent will Fires at the reaper giving Katie a chance to climb into the lift Tower she is forced to jump barely catching hold of the lift seat the reaper undeterred grabs the cable with its tentacle snapping it the group plummets to the ground narrowly escaping into the safe Zone that night they rest in an Old Guard house Katie admits she's terrified confessing she hadn't realized the nature of their enemy she now
sees the rapers as perfect Predators nah shares her perspective the Reapers don't rest nor do they consume humans though they kill them relentlessly they also leave other creatures untouched leading her to doubt their biological nature as the women fall asleep will reflects on an argument with his wife ter Tera had urged him to trust nah claiming she could save the world will resented the notion believing Tara had no business risking her life especially with her vulnerable son to care for nah having no family had nothing to lose but Tara had reminded him that Hunter's filters
would eventually run out and he would die unless they acted will had been unable to dissuade her the next morning the group arrives at an old mine will knows well from his time as a minor however the lower levels dip below the safe Zone making them vulnerable to Reapers moreover the tunnels are poorly sealed increasing the danger Will insists the Hazardous area is only 210 M long and Nina's tracker should detect any Reapers nearby but Nina counters that the device won't work underground furthermore humans exhale carbon dioxide which Reapers can detect instantly after venting her
frustrations with Will Nina is the first to descend into the mine reaching the desired level they find the passage blocked with welded metal The Only Way Forward is to descend another level but this area is undeniably outside the safe Zone will declares he won't turn back and the women reluctantly follow they descend a ladder with Will urging them to take their time to avoid exhaling too much carbon dioxide the team pauses for a break before the final push Katie recounts how at the start of the invasion she had fought with her boyfriend hit him with
a frying pan and driven off in his car which ultimately saved her life the group descends to the next level and presses onward they make it most of the way when a Reaper appears forcing them to flee will tries to shoot the creature but the bullets fail to deter it the reaper relentlessly closes the Gap hurting the team into a dead end will orders the group to shut off their flashlights and hold their breath the Reaper's tentacle probes the area brushing dangerously close to their faces will uses a flare to startle the creature giving the
group a chance to bolt toward a partially collapsed tunnel they scramble inside but Katie takes a wrong turn and is ens snared by the Reaper's tentacles will watches helplessly as Katie is dragged deeper into the mine meanwhile Nina spots a ladder and the pair climbs to a higher level barely evading the pursuing Reaper finally nah and will emerge from the mine and return to the surface safely above the boundary of the safe Zone the pair continues their journey and soon comes across an almost intact pickup truck which they decide to use to travel further before
setting off they stopped for the night in an abandoned house where they managed to find some food supplies during dinner they reminisce about Tara and Katie will regrets taking them through the mine nah however Adis vises him to channel his anger to fight she reveals her plan to return to her lab to retrieve magnesium theorizing that the Reaper's impenetrable scales generate magnetic defensive mechanisms she believes a bullet containing magnesium could penetrate the armor and kill the creature by igniting an internal fire will grows Furious calling her Theory unproven and blaming her for terrorists and others
deaths Nina counters by pointing out that he now faces the same difficult decisions as before the next morning they head to the town and reach the hospital searching for oxygen filters the building is in Ruins and looted forcing them to climb to the top floor there in an operating room will finally finds what he needs but they soon hear the distinct sounds of a Reaper approaching signaling an imminent attack the pair runs but the reaper catches up and even grabs will Nina grabs a fire axe and severs the tentacle enraging the monster even further they
Retreat to the operating room where will orders nah to run while he shoots at gas canisters the resulting explosion hurls the Reaper out of the window where it lies motionless below having achieved his goal will expresses his intent to return to his son nah persuades him to help her first arguing that if she can create the Magnesium bullet Humanity might have a chance she promises to raise her Pirate Flag as a signal that the Reapers can be defeated ensuring that Katie's and Tara's deaths won't be in vain reluctantly will agrees they traveled to Nina's former
Lab at the US Department of energy where she gathers the necessary materials and begins crafting her m IC bullet while guarding her will notices a photograph and learns that nah had a family who perished during the reaper Invasion she survived only because she was at work nah confesses that she blames herself every day for not being at home and regrets not hugging her family one last time will tries to console her saying she couldn't have saved them but nah dismisses his words saying such a life holds no meaning for her realizing it will take her
much longer to perfect the bullet nah urges will to return to his son who is running out of time she promises to keep working and will join him later using her car parked outside will reluctantly drives off in the pickup as Nina continues her work she notices a power cell which inspires her to use Cobalt instead of magnesium just as she finishes the bullet a Reaper attacks her meanwhile will speeds down the road when his truck's tires blow out causing him to crash into a roadside tree he is forced to run toward the safety line
but the Reapers close in cornering him just as he nears safety will fires his gun fully expecting to meet his end suddenly a shot rings out and the attacking Reaper explodes nah arrives just in time wielding her Cobalt infused bullets which caused the Reapers to detonate spectacularly Examining The Remains the pair discovers that the reapers are not biological creatures but Advanced Machines of extraterrestrial origin confirming Nina's Theory however the reason for the specific safe altitude remains a mystery they return to Lost Gulch where Hunter greets his father with delight nah raises her pirate flag signaling
to nearby settlements that she has found a way to kill the Reapers radio communication is restored and survivors spread instructions on how to craft the special bullets to fight the monsters later nah and will visit a Memorial dedicated to the Fallen they leave a bullet at the base of the monument inscribed with Katie's name soon a team of hunters armed with Cobalt bullets sets out on a mission explosions echo through the Rocky Mountains as reapers are destroyed one by one in a post-credit scene humans are shown reclaiming their Planet one night while Nina Star gazes
through her telescope will joins her together they watch as three glowing objects enter Earth's orbit the film unexpectedly turns out better than anticipated for a post-apocalyptic monster movie however the origin of the monsters remains unexplained leaving room for a potential sequel to provide the answers [Music]
