As a comatose Scully fights for her life, Mulder uncovers clues to her abduction, leading to a confrontation with the Cigarette-Smoking Man.
To stop the murders of military officials by an unseen assassin, Mulder and Scully must apprehend an embittered Vietnam vet who can make himself invisible to his victims.
The two police officers who witnessed the spaceship landing during the meteor shower take Lex and Lana hostage and threaten to kill them unless Lex reveals where he hid the spaceship.
Mac tries to prevent a farm couple from being bilked of life savings by "aliens" who promise a better life.
Aliens exchange advanced technology for human cadavers, which they use as hosts for their dying spirits.