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The team investigates reports of aggressive and territorial packs of Sasquatches in the Sierra Nevada Mountains of California; examining footprints and new video.

MonsterQuest

Sierra Sasquatch

A humanlike beast with reptilian skin, reportedly, has been terrorizing Flatwoods, W.Va., since it was first sighted in 1952 hovering over its victims in a strange craft and emitting noxious gases.

Lizard Monster

Investigating whether South American piranhas appearing in U.S. lakes and rivers are adapting, can breed and cause devastation.

Piranha Invasion

Investigating sightings of a giant winged monster known as "Mothman" across America; the monster is blamed for terrorizing a town in West Virginia where a bridge collapse claimed 46 lives in 1967.

Mothman

Examining how giant killer bees from South America are spreading northward into the United States, attack with ferocity and might be adapting to colder temperatures, which would make them an even greater threat.

Giant Killer Bees

Giant pythons have been discovered in parts of Florida for more than a century, but their territory has spread rapidly since 1992's Hurricane Andrew, prompting the team to investigate whether the snakes could threaten the rest of the United States.

Giant Pythons in America

The team investigates witnesses' claims of attacks by a terrifying monster in the back hills of Kentucky whose legendary status dates to the days of frontiersman Daniel Boone.

Hillbilly Beast

An expedition tries to tag the first great white shark in the Atlantic; divers attach a camera to a great white shark to study why they are becoming more aggressive predators.

Monster Sharks

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Scientists search for the truth behind reports of legendary monsters around the world.

S4 E6 | Piranha Invasion