In the icy waters of Alaska, off populated beaches of New York and lurking in ghostly shipwrecks off the coast of North Carolina, scientists have discovered three sharks that have developed unique and deadly ninja skills.

Shark researchers travel to Andros Island in The Bahamas to determine if it's a new great hammerhead hotspot, and they're using reports of a half-octopus, half-shark creature known as the Lusca to help them locate massive sharks for their study.

In Mexico, legends swirl around El Demonio Negro, a 50-foot shark that has terrorized fishermen and tourists alike for generations. Is this an undiscovered predator? Forrest Galante hunts for answers in the most rugged and remote parts of the Baja Peninsula.