A 5-year-old girl in Baltimore befriends an invisible girl named Emily, a seemingly harmless playmate who becomes malevolent toward the girl's family, and a mother and daughter encounter a mysterious girl in Florida in the debut of the documentary series exploring personal accounts of paranormal experiences.

A mysterious disappearance on a California road leads one family to make a ghostly sighting.

A family is confronted by a vicious poltergeist in their new California home; a former deputy sheriff's encounter with a mysterious beast in the wilderness of Oregon is detailed.

A night of UFO sightings in Trumbull County, Ohio, is documented on police radio recordings; a malevolent spirit summoned via a Ouija board terrorizes a young family.

In 1983, a Monroe County Prison convict allowed out of jail to attend his grandfather's funeral finds himself the victim of demonic possession giving him the power to make it rain indoors.

A young mother must protect her children from the unruly spirit that's haunting her house.

A family's scary experiences in a Brooklyn townhouse are detailed

Recounting strange phenomena at Salt Lake City's Capitol Theatre

The origins of a Dybbuk Box, which is said to contain a malevolent spirit, is investigated by its owner after it supposedly created havoc in the lives of two previous owners.

The ghost of a Victorian era mother may be haunting the home of newlyweds.

A single mom has troubling nightmares after moving into an apartment complex in California.

A family learns that their new Connecticut home was once a funeral parlor, and soon strange incidents occur within its walls.

A family fears their Indianapolis mansion is haunted by the serial killer who previously resided there.

The story of an alleged alien abduction is told by the people who were involved.

A creature with 14 inch feet is tracked to a cabin in the woods of London, Ohio; and in North Carolina, a man claims to see an apparition of a red haired girl running across his backyard.

A group of hikers recount their encounter in the Hollywood Hills with a veiled lady wearing a white dress. Also: a California family believes their old farm cottage is protected by something otherworldly.

The story of newlyweds in Chicago who come to believe their home is haunted and uncover disturbing information about the former occupants.

Season 3 begins with the story of a firefighter's widow who feared for the safety of her daughters after unknowingly purchasing a home that once belonged to devil worshipers.

A couple with no children feel like they are being haunted by the son they never had.

Three brothers share their experience of reuniting on a family farm and the disturbing memories they each encountered from their childhood.

The owners of a restaurant in El Paso are convinced that during renovations to the place they inadvertently opened a portal to the spirit world

A devout Baptist family from Indiana's alleged battle with demonic forces is recalled.

Medical professionals from different hospitals in the U.S. reveal their alleged encounters with ghosts.

A newly built home in California becomes a hotbed of paranormal activity, the spirits in question turn out to be the victims of Charles Manson and his cult.

A family who moves into a home in a small southern town experience activity caused by a malevolent entity named "The Bad Man" who in life was a child molester.

Five werewolves hold a family hostage in their own home.

An innocent man is haunted by the face of the saint of the criminal underworld.

A ghostly mayor from the Wild West battles a mother and her daughters.

The story of a property developer who turned an old lakeside mansion into apartments unaware that the home was once used as a refuge for tuberculosis sufferers in the 1920s.

An academic and his wife buy a Southern home only to learn that a jilted socialite committed suicide there and is now believed to haunt the house.

The story of a psychic detective who helped track down a serial killer in New Jersey.

A family believe they are being haunted by a homicidal foster father and a sister trying to prove she's innocent of murdering her brother.

The story of a coven of witches who supposedly trapped people in a Southern plantation house that's now allegedly haunted.

Bill Vaile, a former NASA engineer comes face to face with the paranormal after witnessing what looked like an exorcism while at a job site.

A spirit masquerades as a child.

An exorcist is schooled in the ancient procedure at the Vatican in Rome.

Senior American airmen see alien crafts near a nuclear base in Suffolk, England.

In the Season 4 premiere, the owners of an abandoned motel are pushed to the brink of evil.

Three female college students claim that they are being terrorized by a demon woman hell-bent on tearing their lives apart.

A Pennsylvania politician finds himself doing battle with the ghost of a murderous doctor that haunts his home, and also an ancient pagan god that the doctor once worshipped.

A family claim they are being torn apart by a life-size doll, which they fear is possessed and after their 6-year-old daughter's soul.

A woman who is consumed by guilt over her grandfather's death believes he is haunting her and her family.

A family are fearful of what they describe as a darkness that lurks beneath the inky water of a pond at the back of their property.

A family's dream "forever" home turns into a nightmare when they discover satanic symbols carved into the floorboards and start to believe that a dark, terrifying demon is after one of their souls.

A stroke victim and her family seek a fresh start in a new country home, but instead end up fighting for their lives and sanity when they encounter what they believe to be a band of terrifying Native American spirits.

A woman suspects that something evil is hiding behind a boarded-up fireplace in her apartment in Washington, Mo., which she once thought of as a sanctuary, but now fears is haunted by a witch.

The parents of five girls claim that malevolent forces terrorized them physically and even put a life-threatening curse on the family, which resulted in a near-fatal incident.

Three brokenhearted women renting an old house together seek a fresh start, but instead get what they believe is a supernatural tormentor who is preaching about hell and brimstone.

The story of eight Marines who were sent to guard an ancient and much fought-over outpost in Afghanistan, where they claim they faced a ghostly enemy.

In the Season 4 finale, a couple feel blessed to move into a home that once belonged to their daughter's great-grandmother. That is, until they come to fear that another deceased relative wants them gone.

Author Harper Lee once traveled to Alabama to research an enigmatic preacher accused of murder, and writer Jenny Scott follows in her footsteps.

Three young college students recall moving into a rental property in a rundown Savannah neighborhood and coming face-to-face with the ghost of a demented crack fiend.

Life turns hellish for three young girls from a Hispanic family after they break the rules when playing with a Ouija board.

A loving Christian family are shocked to discover that their eldest son has entered into a deadly contract with the devil, which is why a mysterious and evil "Tall Man" is stalking their home.

A war veteran takes a new job in Lawton, Okla., but the fresh start that he and his brothers decide to make together turns nightmarish when a malignant demon known as the Zozo enters the picture.

A young couple on a sightseeing trip to Point Pleasant enters an old munitions bunker and unwittingly awakens the infamous Mothman - a harbinger of doom that follows them home and subjects them to a reign of terror.

The Pracht family encounters 19th-century murderer Stephen Richards in their new home in the plains of Nebraska.

When a woman rents out the dilapidated guesthouse of her new home after covering up bullet holes and a mysterious hole in the floorboards, strange events start to occur.

Detention officer Jay Yates works the night shift at the infamous Estrella Jail, where a sinister spirit is driving both inmates and officers to insanity and death.

Wolf-like creatures stalk the Bilstein family at their desolate Texas ranch with a horrifying history.

Guest after guest flees an old Victorian mansion hotel in the middle of the night, forcing the owners to confront its terrifying history before a local bride's fairytale wedding is ruined by a ghostly watchman.

A couple camping in the desert see lights in the night sky and figures descending to Earth, and unlock the truth of their alien abduction with hypnotism.

Stacey Hayes manages an abandoned hospital's renovation and witnesses alarming paranormal events; the investigators she calls for help then get trapped and attacked by the forces.