S6, E1: Fish biologist Zeb Hogan is searching for one of the freakiest fish in the world. Vampire fish, known locally as payara, weigh up to 40 pounds, hunt like great white sharks and have terrifying 6-inch fangs. Zeb is heading into the heart of Guyana, South America, to catch a river vampire and find out more about some of the biggest fangs on Earth.