FBI special agents investigate unexplained cases known as `X-Files'. Though the government is convinced that the outlandish reports are false, conspiracy theorist Fox Mulder and realist Dana Scully, for most of the series, stop at nothing to prove that "the truth is out there."
Mulder fakes his own death with Scully's help and accesses a secret research facility that may hold a cure for Scully's illness.
Scully is hospitalised after collapsing, while Mulder receives help from a most unlikely source as he continues to search for a cure for Scully's illness.
Flashbacks reveal how the Lone Gunmen came into being when they met a woman who claimed to be running from an abusive ex - FBI agent Fox Mulder.
Mulder and Scully investigate the disappearance of several people in a remote area of Florida and a boy's claims that he was attacked by an invisible creature.
Mulder and Scully visit a rural community where several women claim to have been seduced by an unusual creature.
While visiting family for Christmas, Scully receives a phone call that leads to a young girl who may be her dead sister's daughter.
Scully and Mulder search for a cure to Emily's illness, then discover shocking evidence about the child's true identity.
Mulder's life is put at risk when an escaped convict with telekinetic powers seeks revenge on the people who put him behind bars.
A teenage boy undergoing psychological counselling becomes the prime suspect in his stepfather's murder.
Scully is drawn into a case involving a murderous doll that terrorises a small New England town.
The brutal murder of a renowned computer programmer leads Mulder and Scully to investigate an artificial intelligence program loose on the internet that has begun evolving on its own.
Mulder and Scully recount their respective versions of events leading up to the death of a teenager suspected of being a vampire.
Mulder and Scully search for answers to a series of horrific mass killings where the victims have been burned alive.
Scully undergoes hypnosis in an effort to remember what happened at the mass burning site. Mulder makes a new enemy.
Mulder discovers that his father was involved in top-secret experiments with zombies during the Cold War.
Mulder suspects that a blind woman may possess the ability to see through the eyes of a killer.
The discovery of a young girl's bizarrely mutilated body prompts her family priest to enlist the help of Mulder and Scully.
Mulder goes undercover to infiltrate a militia group armed with a deadly pathogen. Scully becomes suspicious when he lets a suspect escape, but soon learns his assignment may be a suicide mission.
Mulder is taken hostage by a man who claims that his boss is literally a monster, and then Mulder begins to see the same thing.
Mulder and Scully discover that a teenage chess master is a genetic mutant who holds the key to the origin of the human race.