S1, E1: Ever since the earliest missionaries and explorers returned from Africa, stories have been told of strange water-dwelling monsters living in the Congo Basin. The native Pygmy tribes speak of the Mokele-mbembe, an animal with a long, thin neck and a body the size of an elephant that seems to resemble a sauropod dinosaur. Could there be a population of dinosaurs living in the remote jungle? Starting in Cameroon, where there is a history of Mokele-mbembe sightings, Spain will meet with eyewitnesses at a Pygmy village before setting his camera traps along the river. And it's in the dark of the forest that he'll witness something truly mysterious.