The USAMRIID (United States Army Medical Research Institute of Infectious Diseases) identifies the virus used in the terror attack. The government attempts to administer the WilPharma-manufactured "T-Vaccine", but the cargo truck containing the vaccine is destroyed in another terror incident.
Claire discovers that the G-Virus is stored in WilPharma's Air Dome facility, and informs Leon.
Curtis infiltrates the Air Dome, and obtains the G-Virus.
Downing destroys the Air Dome. Seriously wounded, Curtis injects himself with the G-Virus.
The Air Dome's automated sterilization program is activated. The research facility is also destroyed.
Through their combined efforts, Leon, Angela and Claire are able to fend off Curtis, who has since transformed into a G life-form, and escape from the Air Dome. They arrest Downing as he attempts to conclude the sale of the G-Virus.