A horde of murderous crab monsters descend on a sleepy coastal town on Prom night, and only a ragtag group of outcasts can save the day.

Stranded in a rural area, 2 teens make friends with locals on Halloween but soon run into a cult called C.O.R.N. (Collective Order of Recreational Necrophilanthropists) that have chosen this area to perform human taxidermy.