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."
When the X-Files project is officially disbanded, Mulder and Scully can hardly contain their boredom and set about solving a new mystery involving UFOs.
Mulder and Scully investigate the death of a sanitation worker. Performing the autopsy, Scully discovers a strange worm-like creature inside the corpse.
Mulder and Scully investigate a series of violent killings committed by apparently normal residents of a small town.
A man dies shortly after reporting a fire. Although the authorities fail to detect any trace of the fire, the man's body shows signs of having been burned alive.
Mulder is called in as negotiator when a mental health patient who used to be an FBI agent takes a psychologist and three patients hostage.
Scully is attacked by Duane Barry, the escaped ex-FBI mental health patient. Mulder reaches her apartment to find her missing and blood and broken glass everywhere.
The X-Files have officially been reopened but Scully is still missing. Mulder investigates members of a murderous cult who drink their victims' blood to gain immortality.
Scully is returned in a critical condition. No one knows how she got back or the nature of her illness. Mulder sets out to find Cancer Man.
Mulder and Scully look into the deaths of scientists researching a volcano. Videos reveal a strange figure lurking near the scientists' charred bodies.
Mulder and Scully are called in to investigate the temporary disappearances of several teenagers. The two agents suspect that a religious cult may be involved.
A nurse working nights at an old people's home is raped by an invisible entity which she claims was the spirit of an elderly patient.
A pregnant police woman experiences visions that lead her to the remains of two FBI agents who went missing in the 1940s.
Scully and Mulder look into an incident at a funeral home and its connection with the burial of mutilated corpses at a graveyard in Minneapolis.
In a remote wooded area of New Hampshire, a group of teenagers stumble across a mysterious altar and unleash a malevolent force.
Mulder and Scully investigate the suicides of two Marines stationed at the processing centre for Haitian refugees.
While searching for a killer able to alter his genetic identity, Mulder is stunned when his long-lost sister suddenly appears.
Mulder attempts to catch an alien bounty hunter who holds the key to his sister's whereabouts.
Mulder and Scully investigate the disappearance of animals from an Idaho zoo and the death of a local man, killed by an invisible force.
The agents become stranded aboard a ship where the human aging process is greatly accelerated.
Mulder and Scully investigate a murder in a circus sideshow community where the suspects range from the nearly normal to the really weird.
A young boy's family is plagued by tragedy - who or what is stalking them? Mulder believes a ghost is responsible, but Scully is sceptical.
When a mysterious infection starts claiming lives inside a maximum security prison, Mulder must track two escapees who may be carrying it.
Mulder and Scully are drawn into the strange case of a tobacco company executive's disappearance - could spontaneous combustion be the cause?
During an investigation into the murder of a federal poultry inspector, an increasingly paranoid rural community unites against Mulder and Scully.
Mulder is given a top-secret tape containing proof about government involvement with aliens.