Two sisters on Mexican vacation are trapped in a shark observation cage at the bottom of the ocean, with oxygen running low and great whites circling nearby, they have less than an hour of air left to figure out how to get to the surface.
An insatiable great white shark terrorizes the townspeople of Amity Island, which sets the police chief, an oceanographer and a grizzled shark hunter out to destroy the bloodthirsty beast.
On a remote former submarine refueling facility called Aquatica, a team of scientists are searching for a cure for Alzheimer's disease. Dr. Susan McAlester genetically engineers three Mako sharks, intending to increase their brain capacity so that they can harvest the tissue as a cure for Alzheimer's. Unfortunately, the increased brain capacity also makes the sharks smarter, faster, and more dangerous. Aquatica's financial backers are skeptical and nervous about the tests, and send a corporate executive to visit the facility.
Twenty-something Richard travels to Thailand and finds himself in possession of a strange map. Rumours state that it leads to a solitary beach paradise, a tropical bliss - excited and intrigued, he sets out to find it.
When shark conservationist Dr. Misty Calhoun is invited to consult on a top-secret project run by pharmaceutical billionaire Carl Durant, she is shocked to learn that the company is using unpredictable and highly aggressive bull sharks as its test subjects, which soon break loose and cause havoc.
A traumatized shark expert (Halle Berry) must battle her own fears to lead a thrill-seeking businessman on a dive into a dangerous section of water known as "Shark Alley."
Fin and his wife April travel around the world to save their young son who's trapped inside a sharknado.
A military vessel on the search for an unidentified submersible finds themselves face to face with a giant shark, forced to use only what they have on board to defend themselves from the monstrous beast.