Real monsters are behind our greatest legends. The gates of Hell are unlocked to reveal the surprising truths and devilish secrets of Satan, demons, and other powerful rulers of the Underworld. In the 17th century, a beastly devil is born deep in the woods of New Jersey and is said to still wreak havoc in a place called the Pine Barrens.

Real monsters are behind our greatest legends. This episode takes us into the belly of the beast to find the surprising truths behind history's most mythic cannibals and killers. Does a banshee born during the Revolutionary War still curse the North Carolina woods? Plus, a medieval clan of cannibals out for blood in 16th century Scotland, and did a fairy tale villain named Bluebeard inspire a notorious Chicago World's Fair serial killer? And, could real zombies walk among us, created by a potion from puffer fish?

Some of the greatest stories in history come from the myths of the ancients, stories of the gods and heroes who battle terrifying monsters. However, what truth is there behind these epic tales? Where was the birthplace of Zeus, the most powerful of the Ancient Greek gods? What inspired the infamous serpent-haired enchantress Medusa? Could Thor, the lightning god of the Viking world, be based on a real warrior? This episode unveils the truth behind the legends. Written by Tom Daly

Real monsters are behind our greatest legends. Stories of giants and beasts permeate our past and fascinate us in the present. From the Bible's Goliath to the Cyclops of Greek mythology, our colossal adversaries inspire tantalizing tales of terror.