Dr. Russell Marvin (Hugh Marlowe) and his wife Carol (Joan Taylor) drive through the desert one hot summer night. During the drive, they notice some strange object on the horizon, and Carol identifies it as a flying saucer from outer space. The saucer sends a coded message to Marvin, which he decodes when he returns to his military base. The message asks for a meeting between world and alien leaders, and will take place in just under two months in Washington. During the meeting the aliens express their intentions to take over Earth. Now it is a race against time for Marvin to concoct a weapon powerful enough to defeat the aliens of Earth will be doomed.