In the hidden depths of Lake Champlain is something out of time. Described as a serpent, a crocodile, and even a plesiosaur, it has been part of indigenous legends, and the subject of major TV documentaries. Join us as we go through the evidence of one of the most well-documented cryptids in America to find out if science backs up the stories of more than 3,000 eyewitnesses. Tonight on Uncanny America, we go in search of Champ: The Monster of Lake Champlain.