Governments and scientists race to unravel the mystery behind a visitor's appearance. Dr. Helen Benson is a renowned scientist who finds herself face-to-face with an alien called Klaatu. Klaatu has traveled across the universe to warn of an impending global crisis. She quickly discovers the deadly ramifications of Klaatu's claim that he is a 'friend to the Earth.' Now, she and her young stepson must find a way to convince the entity who was sent to destroy humans that mankind is worth saving, but it may be too late.