Governments and scientists race to unravel the mystery behind a visitor's appearance. Dr. Helen Benson finds herself face-to-face with an alien who has traveled across the universe to warn of an impending crisis. She quickly discovers the deadly ramifications of Klaatu's claim that he is a 'friend to the Earth.' Now, she and her yourng 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.