Mosquito

An alien spacecraft crashes in a U.S. national park, and a mosquito bites its dead pilot, mutating into a huge, bloodthirsty insect. The mutated mosquito begins terrorizing the park as the first clear sign that the danger will not be easily contained. The crisis quickly shifts from isolated incidents to a parkwide threat.

While driving toward a summer camp inside the park, Megan and Ray accidentally hit the mutated mosquito. They later discover a severed proboscis lodged in the car's radiator, a grotesque sign of the creature's reach. The encounter marks the first direct human confrontation with the mutation.

Hendricks, a park ranger, is ordered by the park chief to spray a gaseous mosquito repellent. This response shows the park's attempt to counter the threat with limited tools. The plan's effectiveness remains uncertain as the danger grows.

Three bank robbers—Earl, Junior, and Rex—enter the park and encounter a giant mosquito. Rex runs to an outhouse, where the insect attacks him, and Junior accidentally shoots him. Earl kills the mosquito with a shotgun, illustrating the insect's lethality.

Two park rangers fishing are attacked by mosquitoes. One ranger has his eye gouged out, and the other, after swimming back to shore, is killed when a mosquito stabs him.

A couple in a tent are attacked after the man steps outside to urinate. A mosquito slips into the tent and impales the woman; the man is also attacked. The scene demonstrates how the threat penetrates even seemingly safe spaces.

The next morning, Ray teams up with meteorologist Parks who is investigating a meteorite said to have landed in the park. Parks' radiation monitor begins detecting radioactivity, guiding them toward a boat containing the dead ranger. They drive to the park to notify the police and discover that the park's visitors and staff are dead.

They find the carcass of a mosquito and Megan identifies it as Aedes aegypti. Hendricks informs the group that the park's electrical and communications systems have been destroyed. The team realizes the danger extends beyond the insect and into the park's infrastructure.

Deciding to head for civilization, the survivors steal an RV and attempt to flee the expanding swarm. Earl and Junior attempt to hijack the vehicle but are captured and bound. The group hopes to outrun the mosquitoes, but the future remains perilous.

The mosquitoes swarm the RV, forcing Megan to hesitate at a door while the others scramble for safety. Hendricks saves Megan from falling; Earl breaks free and menaces her as the swarm intensifies. Megan stabs Earl with a severed proboscis, and the swarm crashes the RV, sending them careening off course.

The group crawls through a pipe network to escape the buzzing horde. Inside the pipes, Junior is impaled by a mosquito, his eyes bulging and exploding in a grisly display. The remaining survivors press on, desperate to find a safe escape.

Morning finds Ray, Earl, and Hendricks returning to a nearby farmhouse while Megan and Parks search for the meteorite. They board up the farmhouse to keep the insects at bay and prepare for a final stand. The uneasy alliance between them is tested as the threat closes in.

After sunset, Parks reveals he fought in the Vietnam War, and Hendricks reveals that he did as well. The men brace for another assault as mosquitoes begin infiltrating the farmhouse. They prepare to defend themselves using whatever tools they can find.

In the basement, Parks and Hendricks discover a colossal nest of mosquito eggs. The group rigs the house to explode, using a broken gas line and open windows to accelerate the blast. Ray and Megan set fires and hold off the swarm as best they can.

They escape to the roof via a dumbwaiter as the house explodes around them. Hendricks is killed when the dumbwaiter collapses, but Ray and Megan leap to safety as the structure erupts with the mosquitoes inside. At sunrise, Parks is found alive, having hidden in a refrigerator to survive the blast.