Walter's experiments with a new drug result in a dangerous force; Olivia and Walter examine old case files in New York; Walter struggles with life outside the lab.
When a deadly, viscous organism is discovered inside a strange rock, the agents race to determine the rock's origin.
The future of the X-Files project is jeopardized after Mulder secretly infiltrates the government cover-up of a UFO crash.
To gain tangible proof the organism inside the rock is an alien entity, Mulder joins forces with the duplicitous Krycek and comes face to face with the starling depths of his deception.