Welcome to Herrington High, a place where the cliques are rigid, the hormones are raging, and the faculty has suddenly started acting… weird. Not “tough grading” weird—more like “no blinking, no emotions, and a strange aversion to water” weird.

The group discovers that a homemade diuretic drug called "Scat," sold by student Zeke (Josh Hartnett), is lethal to the aliens because it dehydrates them.

Set in the fictional, rain-soaked Herrington High School in Ohio, the film opens with a sense of institutional decay. Students abuse drugs, teachers are burnt out, and Principal Drake (Bebe Neuwirth) rules with an iron fist. The story follows a group of misfits who have nothing in common—except their suspicion that something is very wrong with the faculty.