Darcy Benson, begins searching for her missing husband and son, unaware that they were killed by the Xenomorphs. Meanwhile, local waitress Carrie Adams discovers she is pregnant. Wolf starts killing Xenomorphs in the sewer, but four manage to escape. He pursues some to the power plant, where collateral damage from the fight causes a citywide power outage. Ricky and Jesse meet at the high school swimming pool but are interrupted by Dale and his cohorts just as the power goes out. A Xenomorph then appears and kills Dale's friends. Another Xenomorph invades the O'Brien's home, killing Tim while Kelly escapes with Molly. Xenomorphs also attack the diner where Carrie works, and she is impregnated by the Predalien. Darcy discovers her body in horror. Sheriff Morales then arrives and brings her with him. Kelly, Molly, Ricky, Jesse, Dale, Dallas, and Sheriff Morales gather at a sporting goods store to collect weapons. Troops from the Colorado Army National Guard arrive but are quickly slaughtered by Xenomorphs. Wolf captures Dallas inside the store to use as bait to lure Xenomorphs, but Dallas escapes. Several Xenomorphs arrive, but Wolf defeats them. Dale is killed during the battle and one of Wolf's shoulder plasma casters is damaged. As the survivors attempt to escape Gunnison, they learn Colonel Stevens is staging an air evacuation at the center of town. Dallas and Kelly, however, are skeptical since going there would cause them to become surrounded by Xenomorphs. They, along with Ricky, Jesse, Molly, and a few others go for the helicopter at the hospital to get out of town, while Sheriff Morales and Darcy head to the evacuation zone. However, the hospital has been invaded by Xenomorphs and the Predalien, who has impregnated some pregnant women to breed more Xenomorphs. Wolf arrives at the hospital and dispatches more Xenomorphs. During the battle, he accidentally kills Jesse. Distraught, Ricky rushes Wolf with rifle fire only to be injured by the Predalien. The Predator is attacked by a Xenomorph and both tumble down an elevator shaft. Dallas takes possession of Wolf's plasma blaster. Dallas, Ricky, Kelly, and Molly reach the roof and fight off several Xenomorphs before escaping in the helicopter. Wolf, having survived the fall, battles the Predalien on the roof in hand-to-hand combat. The two mortally wound each other just as an F-22 Raptor arrives. Rather than a rescue mission, an F-22 executes a tactical nuclear strike