A mysterious alien, Klaatu, travels to Earth with a simple mission- to save the planet. He lands his vast space ship in Central Park and announces his plans to a fearful world watching from all corners of the globe.

He will destroy everything then re-populate our planet with clones of the current species... All except humans who he feels are responsible for Earth's destruction and must be permanently destroyed. He unleashes swarms of dust size robots who sweep through New York and the surrounding area dissolving everything in their path.

As mankind fights to survive, one female scientist convinces Klaatu to stop the earth's destruction and give the human race a second chance.