Before Jeremiah Smith can give Mulder and Scully any information, the bounty hunter arrives and comes after Smith. Mulder and Smith manage to escape and head to a secret facility located in Alberta, Canada. Meanwhile, the alien, who held Scully prisoner until Mulder phoned her, continues his hunt.

Mulder and Scully travel to a bucolic small town where a baby with birth defects is found buried alive in shallow ground. Mulder and Scully follow the trail of evidence to a reclusive family who has a history of inbreeding.

The mysterious deaths of several African-American men, in which the color from their skin is drained, leads Mulder to believe that the Teliko, an African folktale about a creature who must suck the pigmentation from a person's body in order to survive, is behind those murders.

Mulder and Scully investigate the bizarre abduction of several young women that are linked to some distorted photographs.

Mulder is searching for an informant inside a cult compound, but he met Melissa, a cultist who claims to have known him in a previous life during the American Civil War instead.

When a doctor loses control and kills a patient on the operating table, Mulder and Scully begins to suspect a supernatural force may be responsible.

Frohike informs Mulder and Scully about the Cigarette Smoking Man's background. He was a young captain in the US Army recruited to assassinate President Kennedy and then became the mysterious man in a global conspiracy.

Mulder receives information about a militant group that is collecting material to make a highly explosive weapon. An assault team breaks up the group and, during the raid, Mulder and Scully find Alex Krychek, who supplied Mulder covertly with the information on the group. With the traitor's help, the agents are able to obtain a diplomatic pouch containing a rock pulled from the ground in the Tunguska region of Russia.

In a Tunguska gulag, Mulder and many others are infected with the alien virus that uses oil as a medium. The only person who knows Mulder's whereabouts is Scully, who has been called before a Senate Subcommittee hearing on the death of a diplomatic courier, who fell from Skinner's apartment balcony.

When Mulder finds the body of a little girl, which re-opens one of his old cases in the Violent Crimes Unit, he believes that the serial killer whom he captured may have murdered more victims and one of them might be his sister.

Mulder and Scully are on the trail of a mythical beast when a deadly rain caused the death of a girl in a migrant workers camp.

Mulder and Scully investigate the strange disappearance of a man's body from the hospital morgue. When an identical man starts to work at the same hospital, Mulder believes that the man has the ability to regrow parts of his body which include his head.

While Mulder is on vacation, Scully finds her life in danger when she becomes involved with a man bearing a tattoo that talks to him and is telling him to stay away from other women.

X-Rays taken reveal that Scully has a nonoperable tumor located between her nasal cavity and her brain. With Mulder at her side, they head to Allentown, Pennsylvania, to find the women she came into contact with one year ago (Nisei) who may have the answers Scully needs.

After a Jewish man was murdered in a Jewish community, his killers were found murdered too. Mulder and Scully have to determine whether someone is extracting vengeance or larger forces are at work.

When a high-ranking military official was mysteriously assassinated, Mulder and Scully racing against the clock to stop a seemingly unstoppable assassin.

Mulder and Scully are approached by a woman close to Max Fenig. The NICAP member and alien abductee was taking a plane to upstate New York, but she hasn't heard from him. Learning that the flight that Max was on has crashed, the agents head to New York State to search for the reason that Max was on that plane.

Mulder finds the second crash site at the bottom of a lake, revealing a downed U.F.O. However, the military is close behind and Mulder is arrested. To cover their tracks, the military issues an apology to the public using a false story in order to cover up what really occurred in the skies above New York State.

Mulder and Scully involve themselves in an apparant murder case at the Massachusetts Institute of Technology when the murderer's alibi proves to be out there: He claims that an old man had foretold the victim's death. However, the case becomes interesting when the campus security officer who detained the old man is found dead...and frozen solid.

When several babies in the same town are all born with tails, the local OB-GYN is blamed for tampering with fertilized eggs. Mulder suspects a man who proves to be impossible to identify.

Mulder is investigating a case where the main suspect appears to be his own superior, Assistant Director Skinner.

With dead girls turning up, Mulder and Scully's investigation turns to a man in a home for the mentally challenged. The man, who fears for his life, has been able to see the all the victims' deaths before they happen.

Mulder suffers from memory loss when he undergoes an experimental form of hypnotherapy to recover his memories about his sister's abduction. Then, he becomes the only suspect in a brutal double murder.

Mulder finally discovers the ultimate proof of extraterrestrial life when he is contacted by a scientist who has found a preserved alien body in the mountains of Canada. Meanwhile, Scully is forced to confront her own mortality.