Mia Stone experiences precognitive dreams and hallucinations during an investigation.
Lindsay and Peter are under cover as a married couple to investigate aberrant behavior among community residents.
During an investigation, Donner, Stone and Davison are trapped in an elevator.
During a search for three missing operatives, the O.S.I.R. uncovers a gruesome situation, cannibalism.
The team must repress a genetically altered female's violent alien traits.
An angry spirit torments a group of artists in an old church.
Peter's old friend lures him into the wilderness seeking retribution for past deeds.
Oil drilling in an ancient tribal burial ground unleashes a demon killer.
A ghost-like image in a photograph might be the link between a serial killer and a real-life angel.
Mysterious sky-falls may be the result of the Super Sargasso Sea theory.
An autistic boy develops psychokinetic abilities while mourning the death of his twin brother.
A journalist's relationship with a Death Row inmate causes a rare haunting.
Donner and Stone are caught in a sinister plot when they investigate a rave club overrun by zombies.
Axon must race against time to save the life of an alien grounded in a meteor crash.
A spiritual entity is blamed for an outbreak of murders at a Hollywood retreat.
The team's investigation of a woman's precognition of her own death leads to a shocking discovery.
An old man following three Old West outlaws is actually Axon 30 years in the future, warning his younger self against inventing time-travel.
A doctor's mission to colonize a new world forces Matt to make a decision about his future.
The OSIR investigates a plane crash and its survivors, who have been in a sort of limbo since their disappearance 10 years ago.
Matt inadvertently enters an alternate dimension as a contestant on a game show where he must re-examine his life.
The OSIR investigates satanic cult activity on a college campus.
Struck by lightning, a woman must release the electricity through sex in order to survive.
The team encounters a seemingly immortal man as it continues searching for the chairman.
The team investigates a psychic healer; upper echelons of the OSIR are implicated in a murder plot.
Aliens abduct a woman while she is in the custody of OSIR investigators.
A genius tries to regain his memory while working as a janitor at Tessler Industries.
Two computer programmers are killed trying to develop an anti-Y2K program.
The team goes under cover at a reform school after students begin exhibiting psychokinesis.
Two residents of a private community say they were abducted by a UFO.
A woman is wounded while playing a virtual-reality war game.
A St. Valentine's Day murder leads investigators to vampires.
Prisoners in solitary confinement die mysteriously, each of a different cause.
A colleague who apparently died of a heart attack revives at his funeral.
In England the team examines a 13th-century burial shroud bearing a shadowy portrait and both Christian and pagan symbols.
Trolls frighten Praeger's daughter, or else her friend's brother was responsible.
An animal at a wildlife hospice dies under bizarre circumstances.
Hendricks' wife returns from the arch possessed by a spirit.
The corpse of a woman from the future appears in the basement of a condemned apartment building.
A novelist with multiple personalities writes a pattern for murder.
An institutionalized Praeger becomes the target of a demonic cult.
A trigger-happy cop, Praeger's ex-wife and a case of possession link to murder.
Virtually overnight a Cree burial ground becomes a bone-dry wasteland.
Hendricks, who disappeared into the arch and was given up for dead, turns up at a hospital.
The team reunite despite their differences when a scientist returns from the Arch, giving them hope for Hendricks.
A portal may be a path to the afterlife; closed cases reopen; dead clients live.
A Yeti attacks mountain climbers; Kelly thinks Praeger is paranoid.
After traditional tactics fail, Praeger enlists a psychic to help investigate an alien abduction.
The archangel of death possesses Dr. Anton Hendricks.
A seductive demon feeds on Praeger's negativity.
Traces of ectoplasm and a hair ornament are found on a city worker killed in an underground tunnel.
The Schulmans drink human blood to remain just as they were in 1919.
Hendricks sees images of his wife and daughter at a haunted hotel.
A Chinese healer helps Praeger fight a pharmaceutical company's blackmail.
Donner tries to find out why a woman has violent nightmares.
Exotic toads are linked to episodes of psychotic behavior.
Reunited identical twins have peculiar powers that one does not want to share.
Unexplained drownings kill family members of a robber baron.
After a young soldier vaporizes, military authorities are oddly uncooperative with OSIR investigators.
Aliens abduct Praeger and replace him with a clone; Elsinger warns Kelly away from OSIR.
Grisly murders link to a statue of an ancient Chinese warrior.
A woman in a stroke-induced coma appears to be growing younger.
An epidemic leaves its victims in a state of suspended animation.
An alien abduction leaves a man with the power to control living cells.
Two brothers killed in separate accidents return from the dead.
Something that is mutilating farm animals exhibits both human and animal blood traits.
After a mysterious phone call, electricians disappear in a flash of light.
Parasites infest a prehistoric creature found in a Russian glacier.
A mysterious illness claims its victims at sunset; the soul of an accident victim possesses the driver who killed her.
Spontaneous human combustion; a teen with psychic powers struggles to understand events leading to his best friend's death.
A kidney-transplant recipient has frightening visions; a cult leader has power over women.
A dense fog, mass hallucinations and a serial killer arrive simultaneously on death row; an apparition appears to a couple under stress.
A possessed woman takes a horrible vengeance on her philandering husband; a kidnapper transmits his extortion demands psychically.
As wounded Rollins lies near death, his evil doppelganger stalks OSIR.
Plants attack a family; mysterious buzzing coincides with unexplained deaths.
A man undergoing past-life regression predicts the future of someone else; after an elderly man dies, his pet snakes escape.
A homeless man revives during his autopsy and escapes; a fan stalks an actress from the grave.
Deaths at an archaeological dig may explain the mystery of the lost Anasazi; a man claims he was adrift in the Devil's Triangle.
Death strikes archaeologists who uncovered an Egyptian burial chamber; a mysterious woman safely lands a plane hit by lightning.
A werewolf is suspected in cattle mutilations; teen is credited with healing powers.
Extraterrestrials clone farm inhabitants; an apparition communicates with a girl.
A dybbuk invades the souls of innocents; young people pass through a forest's barren zone and instantly age 50 years.
A deadly creature lives in the sewers; strange events follow an accident that claimed a farmer's arm.
NASA scientists die searching for a meteorite; a Californian and her daughter inexplicably find themselves in Toronto.
A sky diver tells of defying gravity; a child fears a destructive force.
Impenetrable darkness threatens to engulf an Argentine town; stress boosts a woman's psychokinesis.
After an elderly man dies, his pet snakes escape; a voice calls a woman home.
A software designer tells of demons attacking; a disoriented man tells of being from the 17th century.
Dan Aykroyd introduces tales of the paranormal.