Inventor Robert Rines, who believes he saw the Loch Ness Monster surface in 1972, searches for evidence to prove his theory that the creature has died.

In the marshy swamp land of Texarkana a legendary beast has hunted the residents of a small Arkansas town. Their story was immortalized in a well known movie, The Legend of Boggy Creek. The real events were a series of violent nocturnal attacks that left behind not only fear and panic but also remarkable tracks. But the evidence is not just confined to history. Scientific clues continue to this day and point to a malevolent monster that stalks the Deep South.

For over 250 years a frightening winged beast has been menacing the residents of New Jersey. The Jersey Devil is described as a winged half-bird half-horse, with hoofed feet, a reptilian tail and a penetrating scream that echoes through the forests of New Jersey's Pine Barrens. Wildlife experts claim that a misidentified but known animal may be responsible for the encounters, but recent witnesses who have seen the beast are scared for their lives, and say the scientific evidence will prove there is a monster.

History tells us that tales of Alligators lurking around in the sewers of New York are based in truth. In the mid 1930s three teenagers pulled an eight-foot alligator from a storm drain. Reports persisted until a skeptical Superintendant of Sewers was forced to investigate for himself. What was found shocked even him - swarms of alligators alive beneath the busy main street of America's biggest city. Crews were sent in to kill the deadly reptiles, but the stories of the gators in the sewers lived on to this day.

High in the rugged wilderness of Colorado's Rocky Mountains a large hairy creature is said to be preying on the elk and frightening residents. The stories date back centuries with the earliest settlers describing terrifying encounters with a large beast whose scream bellows across the hills. Even today ranchers and hikers report a monster they can't explain that may be attacking their horses

Sharks have terrified people for centuries and deep within the forbidding waters of Mexico's Baja Peninsula may lurk a mammoth sixty foot monster. In prehistoric times, huge carnivorous sharks, more than twice the size of a great white, ruled the waves. Marine experts claim these giants went extinct, but evidence may challenge that. Meanwhile, frightened Mexican fisherman talk of being stalked by a "Black Demon"; and sailors report close collisions with a shark unlike anything that they have encountered before.

Increasing close encounters are frightening people in rural America. Historic stories have told of violent abductions by hairy beasts. Monster Quest will investigate whether witnesses are seeing a known animal or the same Bigfoot creature that has been spoken of throughout history. Monster Quest employs polygraph examinations, DNA analysis and bite force tests to discover what monster is turning up its aggression.

A fifty-foot monster is said to lurk beneath the cold, isolated waters of North America. The stories from Lake Okanagan date back to the earliest First Nation peoples, who lived in fear of this terrifying creature in the lake that became known as “Ogopogo.” According to eyewitness accounts, this ominous creature has a large snake-like body, large eyes and can move at high speeds. Sightings of this lake creature are so common that it has been seen more times than Scotland’s Loch Ness Monster, making Ogopogo the world’s most documented lake creature. With new, photographic evidence and an array of high-tech technology, MonsterQuest launches expeditions to this lake.

Mariners have long told stories of frightening beasts that stalk the coast of Florida, but new video could prove that old sailors were seeing real sea monsters. A forked tail, ferocious teeth and a large body were all characteristics of the historic sea monsters. Now, one Florida man says that not only has he witnessed these creatures on countless occasions, but he also has hours of video proof. Experts are divided over the controversial evidence that shows tantalizing glimpses of these strange sea creatures. One marine biologist claims it is a disfigured known species, another expert says it is a seal thought long extinct, and still others maintain that it is something altogether unheard of. Whatever monster lurks here, close to innocent vacationers, MonsterQuest will investigate.

An expedition is launched on to British Columbia's Vancouver Island in search of a legendary Sasquatch that local native tales say would steal children who ventured too deep into the woods.

A look at an 1895 fish attack off the coast of Florida by a Goliath grouper, a massive fish that can weigh up to 1,500 lbs and a recent attack that may be evidence these dangerous fish are returning. Then, other attacks at the freshwater lakes of Minnesota by the no-less-aggressive Muskie could be on the rise.

A look at over 350 reports from the Australian island of Tasmania that claim a vicious predator, once thought to have hunted to extinction, has made a comeback—the Tasmanian Tiger, and how an Australian biologist is using preserved DNA of the animal in hopes of cloning a living specimen.

A look at the rising concern of poisonous jellyfish, from New York's Hudson River, to the beaches of Spain, these animals have become floating deathtraps in the world's oceans, and their population explosion may be the result of mankind's changes to their ecosystems.

A deep trek into the jungles of Papua New Guinea which could be hiding a flying creature local villagers call the "Demon Flyer," whose description is very similar to of the pterosaur of prehistoric origin.

A look at the reports of attacks by the "Monkey Man," a half-man/half-beast that has caused mass-panic around the city of New Delhi, India, where a massive search was undertaken by authorities to find the creature. Then later, the show follows an expedition into the Garo Hills to look for evidence of another possibly unknown primate, the Mande Barung.

A look at the 40-foot long prehistoric "SuperCroc" Sarcosuchus imperator an ancestor of today's crocodiles which can be up to 20 feet long, but witnesses are claiming modern crocodiles are getting much bigger. The show delves into Florida's swamps in search of record-sized crocs that could be returning to their prehistoric size.

The show follows an expedition deep into the jungles of Cameroon in search of evidence of the Mokèlé Mbèmbé – a creature local villagers identify as a long-necked sauropod thought to have gone extinct over 65-million years ago.

The legendary ape-like monster known as Sasquatch is the focus.

Dogs are known as man's best friend, but now canines are striking fear into many who report attacks by predatory packs. Originally descended from wolves, domesticated dogs were brought to the United States 12,000 years ago and used as aggressive protectors. Today, more and more dogs are being turned loose on the streets and returning to their wild roots. These feral dogs are attacking people. Now, MonsterQuest launches a search to follow these ferals, using state of the art cameras to uncover where they live and how dangerous they are to man.

Reports of flying creatures over North America are investigated. Also included is a history of flying creature lore; and an examination of a flying creature caught on film.

A look into the report of chimpanzee attacks and wild chimpanzees, including how powerful and vicious they can be, plus the possibilities of them surviving on their own.

The series follows a group of investigators into New York's wilderness in search of what area residents claim are big black cats, possibly escaped jaguars and panthers, that are stalking the local deer population.

Following the reports of attacks that inspired the Moby-Dick tale from classic literature, an investigative team searches for albino sperm whales to see if there is any truth to their aggressive nature.

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