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Bill Brock seeks out the bat-like Olitiau in Arizona

Bill Brock and his team of hunters travel to Northern California to a river cave called Cross Creek Cavern, where they believe a monster known as the Draco, a vicious lizard/human hybrid, lives beneath the surface of the dark waters.

Bill Brock and his team of hunters travel to Two Guns, Arizona, to the Apache Death Cave - the site of an infamous Native American massacre - in search of the Aswang, a legendary shape-shifting, vampiric creature, part dog and part human.

Bill Brock and his team travel to Peach Springs, Arizona to a show cave called The Grand Canyon Caverns, to investigate a newly discovered section of the cave, unexplored by man but possibly hiding a murderous creature known as the Rake.

Bill Brock and his team suspect recent black bear deaths are due to the Mapinguari: a descendant of the giant prehistoric sloth. Together they travel to Graveyard Gulch, a treacherous cave in Northern California to hunt this deadly monster.