A menagerie of nightmares manifests in a collection of monster encounters, including a prehistoric terror from above, a shadowy backyard beast and a creepy cave cryptid.

Bigfoot is caught on camera; a crazed cryptid goes on the attack in Oregon; a sea monster washes ashore in the Philippines.

A shadow figure stalks a ghost hunter; a hospital poltergeist comes back from the dead; a security guard encounters a ghostly orb; a spooky spirit is spotted in the woods.

Ghostly patients spook a team of paranormal investigators in an abandoned asylum; a father and son spot a UFO; a poltergeist wreaks havoc in a vape shop; and a legendary cryptid (an animal never proven to exist) stalks a group of children.

A Pennsylvania family is terrorized by a haunted doll; two friends witness a fleet of UFOs in the night sky; a man encounters the infamous Yowie in the Australian outback.

A famous monster washes up on a New York beach; parents catch ghosts haunting nurseries on baby monitors; a UFO saves a Russian town.

A ghost appears on the Gettysburg battlefield; a sea monster surfaces in Ireland; fleets of UFOs are spotted over the skies of Philadelphia and The Hague.

A paranormal investigator explores an abandoned hospital; a baby's innocent play beckons a powerful entity; a reptile hunter spots a snake-like object in the sky.

Poltergeist activity is caught on an Irish school's security camera; two Russians encounter what may be a Sasquatch while driving in Siberia; a UFO is spotted flying over Australia in broad daylight.

Ghostly patrons haunt pubs throughout the United Kingdom; a shadow creature stalks a police officer on an empty plane in Mexico City; a sea monster is spotted by multiple witnesses on the Thames.

A man and his son are stalked by a mysterious creature; bone-chilling shrieks strike fear into residents of a Colombian town; Navy radar locks onto an unidentified aircraft.

Experts are baffled by recent sightings of one-eyed creatures; graveyard investigators confront the undead; demonic dolls run amok in a museum of haunted artifacts.

A traveling businessman encounters poltergeist activity in his Texas motel room; a UFO is spotted over one of the holiest sites on Earth; a Sasquatch is spotted by two hikers in British Columbia.

A poltergeist haunts an English antique store; a man and his son encounter bigfoot in Washington; a strange UFO is spotted over Inner Mongolia.

A paranormal investigator is attacked by an entity in an abandoned asylum in Connecticut; a driver witnesses a strange UFO over a hotel in North Carolina; an Oregon marijuana dispensary is haunted by ghosts of the past.

A couple learns they're sharing their hotel room with a ghostly guest in Arkansas; a strange formation floats over a Philadelphia neighborhood; a monstrous creature washes up on a beach in the Philippines.

A poltergeist runs wild; a possessed child defies gravity; paranormal forces collide in Gettysburg, Pa.; a canine has a creepy encounter with the dead.

A pyramid-shaped UFO is spotted over the Pentagon; a man and his children are spooked by a ghost on a Rhode Island playground; a security camera captures strange creatures stalking a California neighborhood.

Friends in Utah track down a Bigfoot spotted in the mountains; a total skeptic is attacked by a spirit at a haunted fort in England; ghostly passengers appear in a Hong Kong airport.

A home security camera captures a dog's scary encounter with a ghost; a strange creature is spotted deep within a cave in the Alps; people all over the globe witness UFOs during the daytime.

A couple encounters a sea monster while boating off the Florida coast; a man's house becomes haunted after he opens a cursed box; a god-like figure walks across clouds in the sky in Alabama.

Paranormal investigators Jason Hawes, Steve Gonsalves and Dave Tango are back for all-new otherworldly adventures in Travel Channel's paranormal reality TV series, "Ghost Nation." The paranormal pioneers respond to urgent calls from local investigators who have reached dead ends while trying to help homeowners deal with high-stakes hauntings. Using state-of-the-art technology, the guys embed themselves in communities across the country to conduct multi-day investigations in an effort to track down the sources of these hauntings and restore peace to both the living and the dead.

Morgan City, La., is experiencing a disconcerting spike in emergency calls related to encounters with ghosts from the bayou city's turbulent past. Police Chief James Blair calls upon a team of paranormal experts to investigate the city's rise in bizarre activity. The team is led by Lousiana native Jereme Leonard, former FBI agent Ben Hansen and psychic medium Sarah Lemos. With the help of local historian Diane Wiltz, the team digs into the area's haunted history and begins the crossing-over process for some of the spirits wreaking havoc on the small community. Learning that the hauntings have spread throughout the area, the team begins working with other police departments to get to the bottom of the ghostly infestation of St. Mary Parish.

The last thing first responders expect to experience on an emergency call is a paranormal encounter. But it's not as unusual as one might think. Each year an alarming number of 911 responders are forced to face their fears as they put themselves in danger to help the living. This first-person, drama/documentary presents terrifying true tales of such encounters, brought to life via reenactments and the perspectives of police officers, firefighters and paramedics who arrive on scene, then find themselves witnessing supernatural phenomena.

In "Ghost Adventures," Zak Bagans and his team of paranormal investigators have visited hundreds of haunted locations both in America and abroad, interviewing locals about alleged hauntings before going face to face with supernatural entities. Along the way, Zak and company have provided answers and help for couples, families and individuals suffering the vengeance of spirits. "Aftershocks" follows up by having the series' most memorable characters recount how things were before Zak's "lockdown" investigation and how their lives have changed since. Are questions still left unanswered? In some cases, paranormal teams that have investigated specific locations after the "Ghost Adventures" team bring their own evidence and insight to the table.

TV personality/executive producer Jack Osbourne teams with paranormal investigator Katrina Weidman on journeys to notorious haunted locations. Not only do these places have dark histories, but they are especially sinister and purported to be doorways to the spirit underworld. Each hourlong episode finds Osbourne and Weidman at a different site, examining unusual incidents while utilizing specialized technology and a network of experts to help document and uncover the truth. Among others, the investigations include Bobby Mackey's Music World in Kentucky, Eastern State Penitentiary in Pennsylvania, the Alaskan Hotel in Juneau, Ohio's Twin City Opera House, and New Orleans' infamous LaLaurie Mansion -- where Jack and Katrina become the only paranormal team to ever examine the disturbing hauntings within its walls.

"The Alaska Triangle" is a Travel Channel series that explores an area in Alaska known for unusual activity, including mysterious disappearances, sightings of strange creatures, lights in the sky, and encounters with ghosts. Some experts speculate that ley lines or electromagnetic anomalies may be causing these bizarre occurrences within the Triangle. The paranormal series investigates enduring mysteries, such as the disappearance of the Douglas C-54 Skymaster in 1950. The Douglas vanished en route from Alaska to Montana, with 44 people aboard, and no trace of the aircraft, its crew or its passengers has ever been found. Another mystery involves a Bigfoot creature that is rumored to have caused a once thriving coastal town to become deserted. In another episode, an eyewitness shares startling video evidence of extraterrestrial activity in Fairbanks, Alaska, while a UFO hunter flies over Alaska's highest mountain in search of a secret underground alien base.

People will spend money for an admission ticket to walk through a haunted house attraction, but would those people embrace the idea of a haunted house if the scary domicile was their own? "My Haunted House" tells of owners who say their homes have ghosts. Interviews with those who have experienced paranormal activity -- coupled with dramatic re-enactments -- bring the spooky stories to life in each of the hourlong episodes, which include two stories of such cohabitation with spirits.