A pregnant police woman experiences visions that lead her to the remains of two FBI agents who went missing in the 1940s while on the trail of a serial killer that later got caught. The killings begin again but the only suspect is now 77.
When someone sends Mulder and Scully obituaries showing three separate but identical men apparently having died, the agents investigate, but things take an unexpected turn when Mulder receives a call from his father.
In a small town in Idaho, a man is killed by what seems to be an invisible elephant. Mulder's investigation into the local zoo, its owners and a local animal rights group uncovers evidence of insidious alien experiments.
The crew of a U.S. military ship that disappeared in the Norwegian Sea is found dead from what seems to be rapid aging. Thinking it's another Philadelphia Experiment, Mulder boards the ghost ship along with Scully and a local skipper.
Scully's former student, Det. Kelly Ryan, asks the agents to help her catch a runaway government scientist responsible for several mysterious disappearances. Mulder realizes that the man is deathly afraid of his shadow for some reason.
Reports of foxfire on a field in Dudley, Arkansas lead Mulder and Scully to a bizarre situation regarding the townsfolk. Employees of the Chaco Chicken Corporation are displaying bizarre behavior, and the death rate is slowly increasing.
Mulder receives an encrypted computer tape containing the defense department's top secret files on extraterrestrial life and becomes a target. Scully takes him to a Navajo family that unearthed a buried secret to decipher the files.
A furious pursuit of Agent Mulder is underway, and more importantly, the government wants the data tape he carried. Agent Scully, against all odds, searches to uncover his whereabouts, persisting that he is alive when all others deny it.
A grumpy old man with psychic powers that show him how someone will die assists the agents with the hunt for a crazed killer who targets psychics. He also cryptically reveals to Mulder and Scully their own ultimate fates.
Shy, overweight women are being pursued online by a suitor who courts them with Italian poetry. The women are being found dead, their corpses stripped of flesh.
Mulder and Scully attempt to protect a boy, whose death could trigger the coming of Armageddon, from a possibly demonic serial killer who targets people with stigmata.