Byron Williams (fictional Character) - Cast

Cast

• Jack Nicholson as James Dale: President of the United States, who wants peace and friendship with the Martians. He is later killed during a negotiation.
• Jack Nicholson also plays Art Land: a Las Vegas real estate developer and Barbara's husband.
• Glenn Close as Marsha Dale: President Dale's wife and First Lady of the United States who is killed by a falling chandelier when the martians attack the White House.
• Annette Bening as Barbara Land: Recovering alcoholic and Art's wife, who is interested in New Age philosophy.
• Pierce Brosnan as Donald Kessler: A British anatomy professor, who thinks the Martians are friendly and (therefore) cannot explain their attacks.
• Danny DeVito as Rude Gambler: An obnoxious lawyer vacationing in Las Vegas who is killed by a martian when he fails to negotiate with a Rolex wristwatch.
• Lukas Haas as Richie Norris: A shy and gentle young Kansas man. He is often ostracized by his family, but is adored by his grandmother.
• Jim Brown as Byron Williams: A former professional boxer who now works at Luxor Las Vegas to earn enough money for his family. During the martians attack at Las Vegas, he sacrifices himself for Barbara, Tom Jones and Cindy to escape, but survives.
• Sarah Jessica Parker as Natalie Lake: A talk show host for Today in Fashion and Donald's love interest. Her head was replaced on her dog's body by the martians.
• Sylvia Sidney as Florence Norris: A senior Kansas citizen.
• Pam Grier as Louise Williams: A Washington, D.C. bus driver and Byron's ex-wife who is more concerned with her sons' rebellious behavior than the Martians.
• Martin Short as Jerry Ross: White House Press Secretary.
• Rod Steiger as General Decker: A warmonger United States Army General who distrusts the Martians.
• Tom Jones as Himself: A famous singer.
• Michael J. Fox as Jason Stone: A network news anchor for GNN.
• Joe Don Baker and O-Lan Jones as Mr. Norris and Sue-Ann Norris: Trailer trash husband and wife and the parents of Richie and Billy-Glen; they consider Billy-Glen as a hero and Richie as the family's black sheep.
• Jack Black as Billy-Glen Norris: Richie's brother and a U.S. Army soldier.
• Ray J and Brandon Hammond as Cedric and Neville Williams: Rebellious sons of Byron and Louise who spend most of their time playing Light gun games.
• Natalie Portman as Taffy Dale: Daughter of President James Dale and First Lady Marsha.
• Paul Winfield as Lt. General Casey: A general assigned as the American ambassador in Nevada.
• Lisa Marie Smith as Martian Girl: A Martian assassin sent to kill President Dale.
• Brian Haley as Mitch: An obedient Secret Service Agent.
• Janice Rivera as Cindy: A waitress at the Luxor Las Vegas Hotel and close friend of Byron's.
• Christina Applegate as Sharona: Billy-Glen's girlfriend.
• Jerzy Skolimowski as Dr. Zeigler: The inventor of a universal translator device.
• Barbet Schroeder as Maurice: President of France.
• Frank Welker as the voice of the Martians, whose speech appears composed entirely of repeated use of the syllable "Ack."
• Roger L. Jackson as the voice of Dr. Zeigler's Martian-language Translator.