Searching for evidence to prove a theory that the Loch Ness Monster has died.

Investigating the mysterious slayings of hundreds of cattle every year in the United States.

Swamp beast immortalized in the film "The Legend of Boggy Creek.".

A team seeks out the truth behind 250 years of stories about the Jersey Devil.

Herpetologists and explorers search for alligators in the sewers of New York City.

A team scales Pikes Peak to hunt for a legendary beast.

Investigating sightings of a 60-foot shark.

Investigating increasing reports of Bigfoot encounters from across the United States.

Investigating sightings of a 50-foot monster known as Ogopogo sighted in Lake Okanagan in Canada.

An expedition investigates sea monster sightings off the coast of Florida.

An investigative team searches for sasquatch evidence on Vancouver Island, Canada.

Goliath grouper off the coast of Florida; monstrous lake fish in Minnesota.

The Tasmanian tiger was thought to be extinct, but might be making a comeback.

A jellyfish invasion threatens to turn oceans into deadly places to swim.

Investigating reports from Papua New Guinea of a terrifying flying monster.

Investigating reports from India of a ferocious creature dubbed the monkey man.

Searching for crocodiles that have killed and injured people.

Searching the jungles of Central Africa for an elusive monster said to resemble a dinosaur.

A team searches for feral dogs to determine how dangerous they are to people.

Investigating the history of reports of flying humanoid monsters in the skies over North America.

Investigating reports from Florida of encounters with potentially vicious wild chimpanzees.

Probing whether dangerous exotic cats are on the loose.

Searching the sea for huge and aggressive albino sperm whales that inspired the novel "Moby Dick."

The team makes an epic ascent in the Himalayas in search of the Abominable Snowman.