The rest of the family trek to a makeshift refugee camp in the woods (where everyone is armed to the teeth). And the fifth wave, unknown, is imminent.Ĭassie's mother dies in the plague. The fourth wave involves snipers who stalk and kill the survivors of the other waves. The third wave is a plague that kills millions more. The second wave is a series of tsunamis that wipe out coastal areas. Then come the different 'waves' of attack from the aliens referred to as ' The Others.' The first wave is an electromagnetic pulse that kills the power across the globe. Her 'normal' life disappears when a mysterious object appears in the sky over earth. Cassie lives with her parents ( Ron Livingston and Maggie Siff) and her little brother Sam ( Zackary Arthur).