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.

Recently, American soldiers in Iraq were photographed with a 3 foot long arachnid. In Peru there is rumors of spiders large enough to attack and kill chickens. A MonsterQuest expedition is sent to South America in search of these creepy crawlers that so many fear.

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.

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.

Fossils of giant rats have been discovered by archaeologists, but are they returning? Follow along as Monsterquest examines reports that these large creatures are inhabiting modern sewers and that some are man-eaters.

Between 1979 and 1983 over 200 livestock were torn apart on the moors of England. Despite the efforts of armed marines, no predator was ever found and the attacks continue to this day. Eyewitnesses allege that a strange "black beast" is the culprit, but new video evidence could have answers to the mystery.

Native American history is full of "Hairy Man" stories and cave art that date back over a thousand years. Did Native Americans know the truth behind the Bigfoot legend? An expedition along the Klamath River into reservation land will use state of the art technology to search for something locals don't doubt is real. With unprecedented access to Native American stories and recent sightings, MonsterQuest examines this creature that is both feared and revered.

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

Investigating reports of huge, man-eating snakes 50 feet or more in length in Venezuela. Also pet pythons that escape, multiply and grow huge in the Florida Everglades.

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.

Investigation of the Chupacabra, or "goat sucker". A mysterious bipedal, blood-draining creature said to be responsible for a rash of unexplained animal killings in Puerto Rico and Texas.

Most people agree that vampires are fictional creatures, but throughout history and even today, there have been cases of people who thirst for blood. These "real vampires" believe that in order to survive, they must feed on the life-force of others. In this episode, we investigate these living vampires to find out if there is a physical reason behind their cravings. Can science separate the fact from the fiction surrounding these "creatures of the night"?

The Sea of Cortez holds a monster of gigantic proportions. Video evidence of what appeared to be a huge squid, 1000 feet under the ocean's surface, was captured in 2006 by a Monster Quest expedition team. The footage is less than 2 seconds long, and difficult to analyze, but some experts believed the squid was up to 100 feet long. Now, MonsterQuest returns to the area with improved technology to find proof of this legendary sea beast.

Investigation into the 2007 Bolivia, North Carolina reports of strange attacks on livestock and pets by a creature that feeds on blood.

Are big bears are getting more assertive and aggressive? In pre-historic times, giant bears weighed up to a ton and stalked early man. Listen as witnesses describe horrific bear attacks and take a look at unusual bear remains. The team journeys from Alaska to New Jersey to learn about bear activity and if hybridization or the next step in bear evolution could produce another crop of giant bears?

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.

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.

Investigation into the adaptability of giant pythons in Florida as their habitat spreads into heavily populated areas such as Miami.

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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.

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.

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.

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.

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 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.