On the evening of May 9, burning cattle ran across a farm in Kentucky, and a flying saucer took off into the sky... The US government soon discovered that the Martian flying saucers had gathered around the earth. After some consideration, US President Dale (Jack Nicholson) decided to announce the arrival of the Martians to the world. In the White House, the first lady Martha (Glenn Close) and daughter Duffy (Natalie Portman) faced the arrival of the Martians as if they were discussing an ordinary visit; in New York, Stone and Natalie, who are engaged in journalism, are preparing to interview Dr. Donald (Pierce Brosnan); in Kansas, Ricky's brother is about to serve as a guard soldier to meet the Martians; in Las Vegas, the former boxing champion Byron is now working hard for his family's livelihood. Finally, the time has come for the Martians to descend. They sent out a signal of peace, but then they started a killing spree. The Martians repeatedly teased the government officials, and the people were helpless. However, the weapon that could really defeat the Martians was beyond everyone's expectations...