On July 2nd, communications around the world are sent into chaos as a signal is detected from what appears to be the moon.
At first, it appears to be one huge celestial body, but it is quickly learned that it is an enormous spacecraft that launches numerous smaller crafts that take positions over major cities around the world.
"Jack" (Jeff Goldblum), a former scientist, figures out that the aliens are using the world's satellites to send signals to each other to coordinate an attack which begins on July 3rd, when the ships begin to attack major cities around the globe.
Survivors of the attack converge on Area 51, a secret, but well-known, military facility in New Mexico. In a part of the facility, which is inaccessible to the majority of the survivors, is an alien craft which ...