Elenco

• Jack Nicholson — President James Dale / Art Land
• Glenn Close — First Lady Marsha Dale
• Annette Bening — Barbara Land
• Sarah Jessica Parker — Nathalie Lake
• Michael J. Fox — Jason Stone
• Rod Steiger — General Decker
• Tom Jones — Himself
• Natalie Portman — Taffy Dale
• Lukas Haas — Richie Norris
• Sylvia Sidney — Grandma Florence Norris
• Lisa Marie — Martian Girl
• Jim Brown — Byron Williams
• Pam Grier — Louise Williams
• Jack Black — Billy Glenn Norris
• O-Lan Jones — Sue Ann Norris
• Christina Applegate — Sharona
• Brandon Hammond — Neville Williams
• Frank Welker — Various Martians (voice)
• Pierce Brosnan — Professor Donald Kessler
• Danny DeVito — Rude Gambler
• Martin Short — Press Secretary Jerry Ross
• Joe Don Baker — Richie's Dad
• Tommy Bush — Hillbilly