While driving through the desert with his wife Carol Marvin to a military base to send the eleventh rocket into Earth orbit to assist the exploration of outer space in Operation Sky Hook, Dr. Russell A. Marvin and Carol see a flying saucer and accidentally records a message on their tape recorder. Once in the base, Dr. Russell is informed by his father-in-law and general that the ten first satellites mysteriously fell back to Earth. When Dr. Russell decodes the message, he encounters the aliens, who ask him to schedule a meeting with the leaders of Earth in Washington in 56 days in order to invade Earth without panicking the population. Dr. Russell develops an anti-magnetic weapon that becomes the last hope of the human race against the hostile aliens.

Director: Fred F. Sears

Writer: Bernard Gordon, George Worthing Yates, Curt Siodmak

Actors: Hugh Marlowe, Joan Taylor, Donald Curtis

Production: N/A

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