The film stars an ensemble cast, featuring Brianne Tju, Benjamin Wadsworth, Uriah Shelton, Ali Gallo, and Peter Giles.

Evanston Hill High School teacher Mr. Lorenzo supervises as students board a bus for a field trip.

A metalhead who appears to be a mutated zombie, later revealed to be a vengeful burnout named Chip, enters the bus and savagely mauls Lorenzo.

In the ensuing commotion, Ever, Tamra, Randall, Steven, Danny, Hunt, and Jacey escape into the woods and seek safety in an abandoned building.

Ever, Tamra, Randall, Steven, Danny, Jacey, and Ryan regroup in a room where they find mannequins dressed to resemble them, realizing someone has specifically targeted all of them.

Ever and Steven return to the bus to look for a phone, although Ever becomes distracted by the radio, discovering that the emergency broadcast was actually a tape recording.

Wayne volunteers, while ex-con and former student, Chip creates a dangerous drug to make people behave like zombies.

After Steven secretly injects the captive students with more of Chip's drug, Randall arms Tamra, Ryan, and Jacey with weapons as he rallies them to kill their supposedly transformed classmates.

With the secret now fully exposed, Ever's allies rescue Danny and lock Steven in a cage with Hunt and the other ravenous "zombies".