Clay, a small, timid, and often-overlooked boy, is the favorite target of bullies at his school. Petite and unassuming, he's never stood up for himself, enduring the daily torment in silence. But when a sudden apocalypse hits, Clay's world shatters as zombies overrun the school. In the frenzy, his classmates abandon him, leaving him to what seems like certain death. When he thought he's gonna die, the zombies just ran passed him as if he's invisible. Empowered by his strange immunity, Clay decides to confront his bullies, using his newfound advantage to seek revenge in the chaos.