When a shark is eaten by a mysterious predator, experts wonder if a prehistoric monster is to blame. A sinister sight is caught on tape near Russia's Area 51, and the evidence might point to a cover-up.

When a terrifying tower of fire is caught on camera, eyewitnesses fear an alien invasion, and using cutting-edge science, experts investigate the threat causing this nightmarish phenomenon—and if a cover-up is hiding the truth.

Near Area 51, a police convoy is filmed transporting a alien-looking craft in the dead of night. When strange beams of light are reported in Argentina, experts investigate if it's proof of a terrifying Nazi superweapon.

A sinister locomotive breathes fire into the night sky, and locals fear it's a demonic train coming to claim their souls. When something terrifying emerges from a mysterious lake in Ireland, experts wonder if it could be a modern-day leviathan.

Experts investigate evidence of flying, fire-breathing creatures.

Footage of a fearsome wolf-like creature in the remote wilderness of northern Canada could be evidence of a dire wolf, a prehistoric beast that went extinct at the end of the last Ice Age; experts use cutting-edge tech to investigate if it has returned.

Deep sea explorers discover an unknown monster thousands of feet beneath the ocean. Killer fog threatens a town in the American Midwest. A truck spontaneously explodes on a busy freeway.

An explorer searching for treasure at a Mayan sacrificial site is attacked by a mysterious underwater fog. Thousands of fish spontaneously jump to their deaths. Something alien appears over the skies of Lost Angeles.

When a massive spider's web takes over a park, experts investigate if this monster's trap could capture a human. A tree spurts out thick red blood, and some believe it could be an undiscovered species of carnivorous plant.

A bizarre explosion is captured that morphs into a sinister black ring of smoke above a California football stadium; experts investigate and uncover an underground network of Satanists with connections to a string of modern-day terrorist plots.

A strange creature like the Loch Ness Monster is recorded in America. Experts analyze evidence of a giant scaly egg, and some wonder if it belongs to a dragon. Birds are suddenly vaporized by an invisible death ray.

When a river of blood washes through a city's streets, some witnesses believe it's a warning of doomsday. A strange perfect circle emerges in the clouds about California, and some experts speculate that it's evidence of alien activity.

When a ghostly figure is caught on tape stalking people in Japan, some fear its hard evidence of a spooky local legend. A mysterious flame appears in the Norwegian wilderness with the fury of the Viking god Thor and it could be a secret weapons test.

When footage of a strange deep-sea vessel is uncovered, experts wonder if its evidence of an autonomous alien craft sent to explore earth, and using cutting-edge tech, investigators follow the clues to an unexpected explanation.

Moments before Pablo Escobar's abandoned luxury building is demolished, cameras capture footage of a ghostly figure in the window, and some believe it was the notorious drug lord himself; experts investigate who this phantom was and what happened to them.

When footage reveals a man's leg taking on a life of its own, it appears that something alien is trying to burst free; cutting-edge science investigates what explains this strange and sinister possession, and what it takes to exorcise the invader inside.

A bizarre, tentacled black mass emerges from the seas on an island in the Caribbean, and on-lookers are horrified as it writhes ashore; experts use cutting-edge tech to investigate the origin of this alien invader.

Doctors discover a mysterious parasitic species inside a man's nose.

Marine scientists discover a gruesome underwater death zone that seems to kill anything that dares to enter. When apocalyptic skies appear during a deadly earthquake in Ecuador, residents fear it's the end of days.

A fire-breathing crater burns in the middle of a desert and some suspect it's a gateway to hell. A deadly shark is found lurking in a golf course water hazard and experts are baffled how it got there. A giant white blob threatens a California town.

When a bizarre, alien skeleton is found in an abandoned compound in the Himalayas, some speculate that it's the corpse of a newly-dead dinosaur, and using cutting-edge tech, experts investigate if it's evidence of a top-secret Jurassic Park.

When cameras capture footage of a massive, never-before-seen sea creature in mysterious waters near Japan, some experts wonder if it's an undiscovered underwater monster; using cutting-edge tech, investigators hunt for this beast of the deep.

Experts investigate how a boy can twist his head 180 degrees.

Evidence of ghostly apparitions is captured at a Civil War battlefield. When strange blue fires start near Yellowstone, some worry if a supervolcano eruption is imminent. Near the site of the Salem Witch Trials, an eerie spectacle stuns scientists.

After cameras capture footage of a UFO over Las Vegas, officials claim it's just a meteor, but some suspect something far stranger; using cutting-edge tech, experts investigate if it's evidence of an alien visit or a top-secret military project.