Plot: The Ryans are the typical dysfunctional family from any suburb: troubled teen Carly thinks only of herself, her woes, and her new boyfriend Damon and doesn't get along with her younger brother Josh; full-time mom Kendall feels desperately that her youthful dreams are gone and her relationship with Carly isn't what it should be; and dad Brent is a CEO who lives in eternal self-disappointment and dreads his parents' upcoming visit. The Ryans' rut abruptly ends one day when without apparent reason, first along their suburb and gradually throughout the country, loving parents turn homicidal on their own offspring. Several parents pursue and kill their children in a bloody slaughter right at their own school. Carly and her best friend Riley escape from the hysterical mob of killer parents, but when they get to Riley's house, Riley's mom is there and kills her daughter, and Carly just barely escapes, helped at the last minute by Damon. They both hurry to Carly's house, where they discover that Kendall and Brent have gotten home early with just one idea in mind: kill their kids at any cost.
Alternative Plot: A teenage girl and her little brother try to survive a wild 24 hours during which a mass hysteria of unknown origins causes parents to turn violently on their own children.
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