On July 2 of a future year, surveillance stations across the United States spotted a huge spacecraft hundreds of miles across approaching Earth. The spacecraft's radio signals interfered with Earth's communications satellite signals and sent out multiple spacecraft up to 15 miles in diameter to fly over major cities on Earth. The enemies and friends of the alien spacecraft were unknown, and people fell into panic and confusion. Computer engineer David (Jeff Goldbram) deciphered the radio signal sent by the aliens, which was actually a countdown signal to an attack. He managed to notify his ex-wife, the president's assistant Connie, but it was too late. On July 3, alien spacecraft began to attack the earth, and human civilization suffered a huge blow and disaster in an instant. The president (Bill Pullman) and others evacuated to the military base and directed the air force to counterattack, but it was like hitting a stone with an egg. It was useless. The military base was also destroyed. Only pilot Steven (Will Smith) managed to induce an alien combat airship to crash. The survivors fled to a secret military base, where scientists have been studying an alien airship that crashed more than 50 years ago, working to find a way to deal with aliens. It is also the last hope of mankind...
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