Plot Summary:Mulder becomes trapped aboard a train rigged with an explosive device. Scully searches for the truth behind the government's secret experiments.
While Mulder remains on the passenger train he believes is holding an alien captive, Scully is led to a disease research facility in Perkey, West Virginia, where she is told ordinary men were subjected to tests. Amidst lies and doubts, Mulder must stop the train - or at least its bomb.