William and Dakota Block wake up one night to sounds from their backyard. The scenery they encounter when they go out to understand what is happening is terrifying. As a result of an explosion, a strange gas has spread and people who breathe this gas have turned into blood thirsty creatures. People who are increasingly aggressive are spreading terror. Dancer Cherry, whose leg was cut off during the attacks, and her ex-boyfriend Wray join William and Dakota, and they begin to investigate the mystery of the events.Summary is created automatically by HDMovieBox.org AI.