Is believing in the Loch Ness Monster's existence really so outlandish? Kangaroos, giant squids, and even tigers were once considered mythical creatures. And a fish thought to be extinct for 65 million years was caught off the South African coast in 1938. It's possible something foreign to us could be hiding in the Scottish lake's cold depths, but is it probable? A detailed study exposes the truth behind the phenomenon, and investigates 80 years of photographs, videos, and thousands of eyewitness accounts.

Is a strange primate, standing 10 feet tall and weighing in at a thousand pounds, roaming the dense forests of the Pacific Northwest? For over 50 years, countless eyewitnesses claim to have seen the creature we've dubbed Bigfoot, and enthusiasts have collected footprints that do not match any bipedal species known to us. So who, or what, is this mythic creature? Scientists examine the facts, use rigorous analysis, and pull together missing evidence to find the truth behind the hairy legend.