Dr. Gregory, a renowned nuclear weapons researcher, is not only dead--he's been charred to a radioactive cinder. Since this is a death on Federal property, Mulder and Scully are hastily called in. As FBI agents who specialize in unexplained phenomena, they are the investigators of The X-Files, strange and inexplicable cases which are also mysteries that the FBI doesn't want solved. When a second victim, completely unrelated to nuclear science or Dr. Gregory is obliterated…