Carlos and May are getting married, but due to Carlos’ strict upbringing they still haven't had sex. After meeting his controlling mother on the night before the wedding, May rebelliously slips into his fiancé’s quarters and seduces him. The next day, as she stands on the altar, May notices that her sweet Carlos is no longer the same. As the party unfolds, he begins to lose control of his impulses, unleashing an epidemic that removes other guests’ social and moral filters, and turns the joyful event into an apocalyptic nightmare.