A group of friends get trapped at a amusement park and strike out an attempt to survive against a mutated rat known as The Killer.

　　大学生史蒂芬妮（凯特琳·桑塔·胡安娜 Kaitlyn Santa Juana 饰）饱受反复出现的暴力恶梦所困扰，于是决定回到家乡，寻找唯一可能打破这个循环的人，并拯救家人免于无法避免的可怕厄运。