Hoff Productions

Marine biologist Dr. Austin Gallagher searches for the holy grail of shark research -- the secret breeding grounds of tiger sharks.

A maneating crocodile terrorizes a town in the Philippines until a team of brave hunters captures a 20-foot-long super croc. But they begin to wonder if they caught the right crocodile or if there is an even larger one out there.

San Francisco Bay is home to various shark species. Alcatraz guards made sure the prisoners knew it, telling stories of sharks to stop escapes.

On a hot summer day, a young man from Philadelphia goes for an afternoon dip; when he is 40 feet from shore he gets attacked and dies; five days later, the Bell Captain at a popular beachside resort is also attacked.

They're the most ruthless killers on earth and out of control. A zombie-like pathogen is spreading to big cats around the world, removing their fear of human civilization. These predators have a thirst for blood, and we're their next target.

Swarms are growing in size and numbers worldwide thanks to global warming, habitat destruction and human encroachment.