A large comet is hurtling toward Earth. The President of the United States initiates a world-wide nuclear weapons launch to stop it. DAVID DEMATTI, a water treatment facility shift leader, discovers that the meteors have polluted the water supply of the southwestern United States, causing a strange and deadly sickness. He tries to learn more, but he is almost killed when a meteor shower destroys his water treatment facility. When David's family (wife KATE and daughter ALISON) is taken into forced quarantine, he tries to follow their police convoy to Las Vegas but is stopped by a meteor shower. David and Lin Lee, a young woman poisoned by the water, team up to fight these apocalyptic disasters and save their families.