Ti West directs this gross-out sequel to Eli Roth's 2002 horror comedy. When John (Noah Segan) decides to accompany his best friend Cassie (Alexi Wasser) to the high school prom, he quickly realises there is going to be a lot more to worry about than Cassie's jealous boyfriend. What starts out as a fun-filled evening quickly descends into a nightmarish fight for survival when the bottled water provided for the event becomes infected with a devastating flesh-eating virus. With the school put under quarantine and the students and teachers rapidly succumbing to the sickness, John and Cassie must fight for survival, even battling their infected friends in order to escape.