AnalienstarshipcrashesinaswampinaU.S.NationalPark.Somemosquitosbegintofeedfromthealien'scorpses,causingthemtogrowtothesizeofavulture.Thesemutantinsectsbecameveryagressive,killingeveryhumanbeingtheyfind.Willthefewsurvivorsfightsuccessfullyagainstthisnightmare...?