An expedition searches for Champ, a dinosaurlike creature that some say they have seen in Lake Champlain.

An expedition investigating a report of a Bigfoot attack at a Canadian fishing cabin finds blood and tissue samples said to be from the beast.

An expedition travels to the Sea of Cortez off Mexico's Baja Peninsula to use specially designed lures with built-in cameras in hope of spotting a giant squid 1,000 feet below the surface.

Two expeditions try to trap mysterious dog-killers; a beast described as a mutant kills pets in Maine and Minnesota in 2006.

Mountain lion attacks on people make headlines across the U.S., but some people say they have seen something else: a mysterious big, black cat.

Expeditions travel from the Amazon to the Arctic Circle in search of giant freshwater fish; catfish large enough to swallow a child; trout as big as a boat.