Sightings of serpentine creatures lurking in dark waters around the globe have been documented for centuries. The MonsterQuest team investigates two legends in an attempt to uncover the truth of what lies below the surface.

Is Bigfoot a terrifying myth or a real violent creature? The MonsterQuest team investigates the Bigfoot mystery by going into the wild to examine photos, audio recordings and eyewitness accounts.

Large and dangerous cats are stalking suburban neighborhoods throughout the United States. Witnesses claim they are attacking humans and killing deer. The MonsterQuest investigation team goes undercover to examine evidence and eyewitness accounts to reveal the identity of this beast before it kills again.

All over the world, Scientists are noting an increase in the numbers of jellyfish in the oceans. They mount various expeditions to investigate the mechanisms that seem to be causing this phenomenon.

The MonsterQuest team is investigating sightings of dangerous ape like creatures across North America. They want to know whether these are apes in the wild or a mysterious legend that stalks forests and swamps.

Something strange is killing animals and sucking the blood from its victims. Scientists investigate whether this creature is the mysterious Chupacabra of legend, or a gruesome new hybrid mutation?

They're huge, ferocious and frightening. They live in remote corners of the world. The Monsterquest team investigate whether there are real dragons or descendants of prehistoric reptiles.

In legends, they're called "krakens": enormous squid with tentacles that terrify and can squeeze the life from sailors. MonsterQuest goes into the deep to capture the first footage of these giant squid.

It is alleged that New York, the most populated metropolis in America, is home to a colony of dangerous alligators. Monsterquest sets out to prove if it is true, or only an urban legend.