Independence Day is a 1996 American science fiction action film directed and co-written by Roland Emmerich. The film focuses on disparate groups of people who converge in the Nevada desert in the aftermath of a worldwide attack by an extraterrestrial race of unknown origin. Along with the rest of the world, they launch a last-ditch counterattack on July 4 – Independence Day in the United States.
Part - 1
On July 2, 1996, an enormous alien mothership that has one fourth the mass of the Moon enters orbit around Earth, deploying 36 smaller spacecraft, each 15 miles wide, that take positions over some of Earth's major cities and military bases. David Levinson, an MIT-trained satellite technician, decodes a signal embedded in the global satellite transmissions that he determines is a timer counting down to a coordinated attack. With the help of his former wife, White House Communications Director Constance Spano, Levinson, and his father Julius, gain access to the Oval Office and warn President Thomas J. Whit more that the aliens are hostile. Whit more orders large-scale evacuations of New York City, Los Angeles, and Washington D.C., but it is too late; the timer reaches zero and the ships activate devastating directed-energy weapons, killing millions. Whitmore, the Levinsons, and a few others, narrowly escape aboard Air Force One as the capital is destroyed, along with other locations over which the ships are positioned.
Part - 2
On July 3, international military leaders begin ordering individual counterattacks. Their aviation forces attack destroyer ships positioned above the ruins of the cities, but they are protected by force fields. Each destroyer launches a swarm of attack fighters, which wipe out the human fighter squadrons. Captain Steven Hiller, a pilot with the Marine Corps squadron VMFA-314 based out of Marine Corps Air Station El Toro, survives by luring his attacker to the enclosed spaces of the Grand Canyon and sacrificing his plane, forcing the alien to crash-land. He subdues the injured alien pilot and flags down a convoy of refugees, hitching a ride with former combat pilot Russell Casse. They transport the unconscious alien to nearby Area 51 where Whitmore's group has landed. Through Secretary of Defense Albert Nimzicki, they learn that a faction of the government has been involved in a UFO conspiracy since 1947, when one of the invaders' attack fighters crashed in Roswell. Area 51 houses the refurbished alien fighter and three alien corpses recovered from the crash.
When eccentric scientist Brackish Okun examines the alien captured by Hiller, it regains consciousness and attacks. It telepathically invades Okun's mind and uses his vocal cords to communicate with Whitmore before launching a psychic attack against him. Whitmore sees visions of the alien's plans: their entire civilization travels from planet to planet, exterminating all indigenous life and harvesting the planet of all natural resources. After Secret Service agents and military personnel kill the alien, Whitmore reluctantly authorizes a nuclear attack; a B-2 Spirit fires a nuclear
cruise missile at an alien destroyer positioned above Houston, but the ship remains intact.