to his dismissal from his position as a top-level researcher at USAMRIID. Upon returning to the lab, Ira and Harry discover that Woodman has stolen their research, forcing them to infiltrate the base in disguise to get another meteor sample. They discover that the caverns now harbor an alien rainforest teeming with tropical plant and animal life, including flying insects and carnivorous plant-life. That night, a large reptilian creature fatally mauls the owner of a local country club where Wayne works, and the next day a dog-sized frog-like animal attacks two elderly ladies in their home. Ira, Harry and Wayne find a valley behind the home filled with suffocating dragon-like creatures, which they theorize cannot yet breathe oxygen and are escaping from the meteor site through the local caverns. However, a newly-born dragon quickly adapts to the earth's oxygen and terrorizes a shopping mall before the trio gun it down. With the media becoming increasingly aware of the alien attacks, Governor Lewis visits the site demanding answers, furious at not being informed earlier about the situation. Allison believes that the aliens will engulf the United States in two months, and Woodman suggests a napalm strike to destroy the meteor's contents and the surrounding town. Though Lewis opposes bombing the community, primate-like creatures suddenly attack the base and wound several members, persuading him to approve Woodman's napalm strike. Disgusted, Allison quits the CDC and joins Ira's crew. Ira later realizes that intense heat triggers the aliens' DNA and that the initial impact to Earth activated its evolution. Woodman ignores Allison's pleas and the town begins evacuating for the impending bombing strike. Looking at the positions of nitrogen and carbon on the periodic table on the back of Allison's T-shirt, Ira theorizes that selenium might be as toxic to the aliens as arsenic is to Earth's carbon life. Rather surprisingly, two of his dumbest students, Deke and Danny Donald, recall that selenium sulfide is the active ingredient in Head & Shoulders hair shampoo, which they decide to use against the alien organisms. Wayne procures a firetruck and fills it with the shampoo with help from Ira's college students. However, Woodman's napalm strike goes off ahead of schedule before the team can try their plan, triggering the entire alien ecosystem to fuse together into a single immense amoeba-like blob that stands hundreds of feet tall. The giant mass begins multiplying through mitosis, which