Nick's quest takes him to Slovenia in search of a bizarre, sightless salamander. He descends deep into the mountains to find the proteus or olm, dubbed the 'human fish' because its skin resembles human flesh. Nick camps underground for three days in an attempt to experience this light-deprived world and the effect it has had on the olm's evolution.

Nick heads to the United States in search of a creature with the claws of a bear, the jaws of a griffin and the biggest bite in the animal kingdom: the alligator snapping turtle.