<P> Billy - Glenn's brother Richie discovers that the Martians' heads explode when they hear Slim Whitman's song "Indian Love Call ." He and his grandmother Florence drive around town, using the song to kill the Martians . The military thereafter broadcast the song around the globe, killing most of the Martians and their leader and causing the few remaining survivors to try to flee from Earth . Nathalie and Donald's disembodied heads kiss while the Martian spaceship they are on explodes when it crashes into the ocean . </P> <P> In the aftermath, Richie and Florence are awarded the Medal of Honor by Taffy, she being the only surviving member of the government . Byron, who survived his brawl with the Martians, arrives in D.C. to reunite with his former wife Louise and their two sons Cedric and Neville (who saved Dale's life back in the White House using two guns they stole from a dead Martian) as the devastation is being cleaned up . Barbara, Cindy and Tom Jones emerge from a cave with some animals to see dozens of crashed Martian ships in the adjacent Lake Tahoe . </P> <Ul> <Li> Jack Nicholson as President James Dale, the President of the United States . <Ul> <Li> Nicholson also portrays Art Land, a developer in Las Vegas . </Li> </Ul> </Li> <Li> Glenn Close as First Lady Marsha Dale, James Dale's wife . </Li> <Li> Annette Bening as Barbara Land, Art Land's wife . </Li> <Li> Pierce Brosnan as Professor Donald Kessler, a scientist working for President Dale who is later captured and experimented on by the Martians . </Li> <Li> Danny DeVito as Rude Gambler </Li> <Li> Martin Short as Press Secretary Jerry Ross </Li> <Li> Sarah Jessica Parker as Nathalie Lake, a talk show host who is later captured and experimented on by the Martians . </Li> <Li> Michael J. Fox as Jason Stone, a news reporter who is killed during the Martians' first attack . </Li> <Li> Rod Steiger as General Decker, a U.S. Army general who works for President Dale . </Li> <Li> Lukas Haas as Richie Norris, Billy - Glenn Norris's younger brother . </Li> <Li> Natalie Portman as Taffy Dale, James and Marsha Dale's daughter . </Li> <Li> Jim Brown as Byron Williams, a Las Vegas casino employee and former boxer . </Li> <Li> Lisa Marie Smith as Martian Girl, a Martian posing as a human female . </Li> <Li> Sylvia Sidney as Florence Norris, Richie and Billy - Glenn's grandmother . </Li> <Li> Tom Jones as Himself </Li> <Li> Christina Applegate as Sharona, Billy - Glenn's girlfriend . </Li> <Li> Pam Grier as Louise Williams, Byron's former wife . </Li> <Li> Jack Black as Billy - Glenn Norris, a U.S. Army private who is Richie's older brother and gets himself killed trying to stand up to the Martians . </Li> <Li> Paul Winfield as General Casey </Li> <Li> Janice Rivera as Cindy, a co-worker of Byron . </Li> <Li> Brian Haley as Mitch, a Secret Service agent . </Li> <Li> Joe Don Baker as Mr. Norris, Billy - Glenn and Richie's father . </Li> <Li> O - Lan Jones as Sue - Ann Norris, Billy - Glenn and Richie's mother . </Li> <Li> Ray J and Brandon Hammond as Cedric and Neville Williams, Byron and Louise's sons . </Li> <Li> Jerzy Skolimowski as Dr. Zeigler, a scientist who created a device that (badly) translated the Martian language . </Li> <Li> Barbet Schroeder as Maurice, the President of France . </Li> <Li> Joseph Maher as White House Decorator </Li> <Li> Steve Valentine as TV Director </Li> <Li> Frank Welker as Martian Vocal Effects </Li> <Li> Roger L. Jackson as Dr. Zeigler's translator (voice uncredited) </Li> </Ul> <Li> Jack Nicholson as President James Dale, the President of the United States . <Ul> <Li> Nicholson also portrays Art Land, a developer in Las Vegas . </Li> </Ul> </Li>

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