Blackwood, Texas: After falling through a hole in the ground, a young boy is infected by the alien Black Oil. One week later, in Dallas, a federal building is bombed by terrorists, killing five people, including the Blackwood boy. Mulder and Scully, now part of an FBI anti-terrorism unit, learn that the boy as well as three other victims were dead even before the bombing, cause of death: an alien virus. In the Texas desert, the agents find an agricultural complex that may hold the key to unlocking the government conspiracy surrounding the extraterrestrials and their lethal virus.