Steve Backshall and the crew scour the wetlands of Venezuela in search of more lethal beasts. Steve heads into crocodile infested waters for a spooky nocturnal encounter with a truly shocking predator, the electric eel. He joins a team trying to save a highly endangered predator, the Orinoco crocodile, and witnesses the ferocious maternal instincts of a female croc protecting her nest. Steve then leaves the wetlands for the rainforest and heads into a dark cave infested with vampire bats. Here a true toxic terror lurks, the scolopendra, a giant centipede armed with a powerful venomous bite. Before leaving South America, Steve takes the opportunity to cross the border into Brazil and gets a close-up view of one of the world's rarest canines, the maned wolf.