Epic action and mind-blowing effects rock the planet in this thrilling reinvention of the 1950s classic The Day The Earth Stood Still. Keanu Reeves is Klaatu, a being, whose arrival on Earth triggers an unstoppable series of events that threaten all of mankind. In a desperate attempt to save humanity, governments and scientists race to unravel the mystery behind the visitor's appearance. When a woman (Jennifer Connelly) and her young stepson find themselves embroiled in Klaatu's plan, they become the world's only hope to stave off apocalyptic annihilation.