
The series takes a scientific look at creature sightings around the world, with episodes devoted to the Loch Ness Monster, Bigfoot, werewolves and even a Stalinist attempt to breed a race of supersoldiers by cross-breeding humans and apes. The show is described as one-part history, one-part science and one-part, well, monsters.

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

Across the world, people are reporting increasingly frequent encounters with frighteningly large crocodiles.

The team embarks on a dangerous search in the Sea of Japan and along Australia's Great Barrier Reef to investigate reports of a jellyfish invasion that threatens to turn oceans into deadly places to swim.

An expedition investigates controversial evidence that might confirm a history of sea monster sightings off the coast of Florida.