Phil and Molly are about to reach the happiest day of their life: their marriage. As the two plan the perfect wedding several flaws come into the way, namely the guests. As unhappy parents, a judgemental bridesmaid, a rowdy brother delighted to drink as much as possible, and an unconvential priest supervising a trainee who just happens to be a bitter coworker threaten the wedding the two manage to get to the day of their dreams. Until one of the guests' death begins to point to demons that is. As a brutal and apocalyptic battle wages no one is spared in either way as a vicious horde descends upon the wedding, using the rage of those in attendance to spur a bloodlust. As bodies pile up and tensions reach an all time high the guests and couple must fight to survive, and possibly become family in the process.
