The film begins with a group of tourists on a boat tour in Arizona, where they encounter a swarm of piranhas. The piranhas are not your ordinary fish - they've been genetically modified to grow at an alarming rate and are incredibly aggressive.

Here's a brief write-up:

The film stars Elisabeth Shue, Adam Scott, and Jerry O'Connell, among others.

Piranha 3D received mixed reviews from critics, with some praising its over-the-top gore and others criticizing its lack of originality. Despite this, the film has developed a cult following over the years.