On July 2nd, communications systems worldwide are sent into chaos by a strange atmospheric interference. It is soon learned by the military that a number of enormous objects are on a collision course with Earth. At first thought to be meteors, they are later revealed to be gigantic spacecraft, piloted by a mysterious alien species. After attempts to communicate with the aliens go nowhere, David Levinson, an ex-scientist turned cable technician, discovers that the aliens are going to attack major points around the globe in less than a day. On July 3rd, the aliens all but obliterate New York, Los Angeles, and Washington. The survivors set out in convoys towards Area 51, a strange government testing ground where it is rumored the military has a captured alien spacecraft of their own. The survivors devise a plan to fight back against the enslaving aliens, and July 4th becomes the day humanity will fight for its freedom. July 4th is their Independence Day…

Cableman Roy Neary is one of several people who experience a close encounter of the first kind, witnessing UFOs flying through the night sky. He is subsequently haunted by a mountainlike image in his head and becomes obsessed with discovering what it represents, putting severe strain on his marriage. Meanwhile, government agents around the world have a close encounter of the second kind, discovering physical evidence of otherworldly visitors in the form of military vehicles that went missing decades ago suddenly appearing in the middle of nowhere. Roy and the agents both follow the clues they have been given to reach a site where they will have a close encounter of the third kind: contact.