Researchers on the undersea lab Aquatica have genetically altered the brains of captive sharks to develop a cure for Alzheimer's disease. But there's an unexpected side effect: the sharks got smarter, faster, and more dangerous. After a big storm damages their remote research facility, they must fight for their lives.

This third film in the series follows a group of marine biologists attempting to capture a young great white shark that has wandered into Florida's Sea World Park. However, later it is discovered that the shark's 35-foot mother is also a guest at Sea World. What follows is the shark wreaking havoc on the visitors in the park.

When flesh-eating piranhas are accidently released into a summer resort's rivers, the guests become their next meal.

When an accidental death verdict is given on discovery of the remains of a top scientist, within the stomach of a hammerhead shark his closest friend Marine Biologist Steven McRay is not happy with the explanation and travels to investigate further, where he discovers that his friend's death was not an isolated incident, and that the l...

Each year the population of sleepy Lake Victoria, Arizona explodes from 5,000 to 50,000 residents for the annual Spring Break celebration. But then, an earthquake opens an underwater chasm, releasing an enormous swarm of ancient Piranha that have been dormant for thousands of years, now with a taste for human flesh. This year, there's ...