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As the story progresses, flashbacks reveal Cassie's previous life—filled with school, soccer matches, and innocent crushes. She shares a life with her brother, Sam, and their father, Oliver. The tranquility of their days is shattered when the world is first introduced to the alien threat manifested as a mysterious UFO hovering ominously above, leading to catastrophic events that unfold in waves.
The first wave is characterized by an electromagnetic pulse that knocks out all electronic devices. The chaos escalates as the second wave results in cataclysmic tsunamis, followed by a deadly modified avian flu that devastates the human population—deepening the film's exploration of loss and tragedy.