he newly inaugurated president, Charles Halsey, is rushed to a secret bunker when authorities realize that an alien object is racing towards Earth. It crashes on the moon but the military soon discovers a fleet of alien vessels heading straight for the planet. Halsey's only advisers are two outgoing members of the previous administration and the Air Force general in charge of Space Command. There is little information to go on and the new president has to decide if the aliens are friends or foes.

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