Japan's waters are home to the largest diversity of shark species on the planet, most of which take otherworldly forms. Wildlife biologist Forrest Galante, along with deep-sea marine scientist Christina de Silva and deep-water surveyors, track down and study these alien sharks in their mission to uncover whether the critically endangered Angel Shark remains in Japan's waters. Along the way, Forrest will uncover 17 different and unique species and witness the births of little-known Velvet Dogfish sharks.