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Greenland

Structural engineer John Garrity lives in Atlanta, Georgia, with his estranged wife, Allison, and their diabetic son, Nathan. He is on the way home to watch the near-earth passing of a recently discovered interstellar comet nicknamed "Clarke", along with his family and neighbors.

While at the supermarket, John receives an automated DHS message announcing that he and his family have been selected for emergency sheltering. He returns home just as a comet fragment is seen entering the atmosphere on live TV. Previously expected to land in the ocean near Bermuda, the fragment instead strikes Tampa, vaporizing the city along with most of the state. John then receives a call with instructions to head to Robins Air Force Base for an evacuation flight, as Clarke is on a direct collision course to Earth and the impact will cause an extinction-level event in two days. John, Allison, and Nathan pack up and drive away.

The way to the base is clogged by heavy traffic, so the Garritys abandon their car and continue on foot. Nathan's insulin is accidentally left behind in the car. As they reach the base, John realizes it is missing and goes back to retrieve it. Meanwhile, Nathan's medical condition is discovered, disqualifying him for sheltering, and Allison stays with him. John returns and boards a plane, but quickly jumps off upon realizing Allison and Nathan were left behind.

As John exits the base, a panicked mob breaks in, destroying several evacuation planes when gunfire ignites spilled jet fuel. Returning to their car, John finds Allison's note saying they are going to her father's home in Lexington. After getting medical supplies, Allison and Nathan hitch a ride with Ralph and Judy Vento, only for Ralph to kidnap Nathan to use him and the wristbands to board a flight.

John hitch-hikes a ride on a military truck full of people heading towards Canada, planning to get off in Lexington. A passenger named Colin tells him they are headed to Osgoode, Ontario, where private planes are flying to Greenland, believed to be the military evacuation site. Another man attempts to steal John's wristband, causing the truck to crash, killing Colin. John is forced to kill the other man in self-defense.

At another air force base, the Ventos attempt to pose as Nathan's parents, but are arrested when Nathan reveals he's not their child. Allison and Nathan are reunited shortly after at a nearby FEMA camp in Knoxville.

The following morning, John learns that the largest fragment will hit in approximately 24 hours. Stealing a car, John reaches his father-in-law, Dale's, house, and Nathan and Allison arrive shortly after. The family learn about a complex of underground bunkers near Thule Air Base in Greenland, confirming that is where the evacuees are being sent. Dale chooses to stay behind, bidding farewell to his daughter's family.

John, Allison, and Nathan proceed in Dale's truck. While making steady progress to Osgoode, the family learns over the radio that Clarke's largest fragment, which is 9 miles (14 km) wide, will hit Western Europe and obliterate it. They arrive at the Osgoode airport just in time to board the last flight out. As they reach Greenland, a comet fragment strikes, causing the plane to crash and hit a glacier,killing the pilot. The Garritys and the rest of the passengers flag down a military truck and enter the bunker complex just as the largest fragment enters the atmosphere and hits Earth, devastating civilization along with the world.

Nine months later, the bunker makes radio contact with other survivors around the world. The Garritys and other occupants exit the shelter, as reports come in that the atmosphere is finally clearing, giving the survivors the chance to bring Earth back onto its feet.