Something is sabotaging a 太空 launch program. And every discriminating clue is pointing at the commander of the team, who once claimed to have seen an alien in 太空 while witnessing Mars from Earth orbit.
A therapist working with children from abusive families is found to be implanting them with the memories of her own abuse suffered at the hands of her late father, when one of her patients tries to kill his stepfather.
While imprisoned in Russia and infected with the Black Cancer, Mulder learns that Krycek is working with the men responsible and everything has been a setup from the start.
An investigation into a video of an alien autopsy puts Mulder and Scully in the middle of a conspiracy involving WWII Japanese scientists brought to America to continue their experiments which may shed light on Scully's abduction.
Mulder and Scully, reunited at last, head for an active 火山 under a geological study and find a deadly life form that can survive in the searing heat of the crater and is killing the scientists to avoid being discovered.
Mulder and Scully are contacted 由 a communications specialist from NASA who shows them evidence of sabotage in the 太空 programme. Mulder's youthful hero-worship is shaken 由 the apparent involvement of a high-ranking astronaut.