Rollebesetning

• Will Smith — Captain Steven Hiller
• Bill Pullman — President Thomas J. Whitmore
• Jeff Goldblum — David Levinson
• Mary McDonnell — First Lady Marilyn Whitmore
• Judd Hirsch — Julius Levinson
• Robert Loggia — General William Grey
• Randy Quaid — Russell Casse
• Margaret Colin — Constance Spano
• James Rebhorn — Albert Nimzicki
• Harvey Fierstein — Marty Gilbert
• Adam Baldwin — Major Mitchell
• Brent Spiner — Dr. Brackish Okun
• James Duval — Miguel
• Vivica A. Fox — Jasmine Dubrow
• Harry Connick Jr. — Captain Jimmy Wilder
• Devon Gummersall — Philip
• John Bennett Perry — Secret Service Agent
• Tim Kelleher — Technician
• Jay Acovone — Area 51 Guard
• John Capodice — Mario
• Kristof Konrad — Russian Pilot
• Barry Del Sherman — Street Preacher
• Anthony Crivello — Lincoln
• Joe Fowler — Reporter
• Sharon Tay — Reporter
• Kimberly Beck — Housewife
• Andrew Keegan — Older Boy
• Pat Skipper — Redneck
• Erick Avari — SETI Chief
• Frank Welker — Aliens (voice)
• Steve Giannelli — Radar Technician
• James Wong — SETI Technician 1
• Yelena Danova — Russian Newscaster
• Adam Tomei — Sailor
• Wayne Wilderson — Area 51 Technician
• Vanessa J. Wells — Newscaster
• Sayed Badreya — Arab Pilot
• Ross Lacy — Aide
• Richard Speight Jr. — Ed
• Raphael Sbarge — Commander / Tech
• Randy Oglesby — Mechanic
• Mirron E. Willis — Aide
• Mark Fite — Pilot
• Mae Whitman — Patricia Whitmore
• Lyman Ward — Secret Service Agent
• Lisa Jakub — Alicia Casse
• Leland Orser — Technician/ Medical Assistant 1
• Kiersten Warren — Tiffany
• Kevin Sifuentes — Tank Commander
• John Bradley — Lucas
• Jim Piddock — Reginald
• Janette Andrade — homeless victim
• Jana Marie Hupp — SETI Technician 3
• Jack Moore — Mechanic
• Greg Collins — Military Aide
• Giuseppe Andrews — Troy Casse
• Frank Novak — Teddy
• John Storey — Dr. Isaacs
• Eric Paskel — Radar Technician
• David Pressman — Whitmore's Aide
• David Channell — Secret Service Agent
• Dan Lauria — Commanding Officer
• Bobby Hosea — Commanding Officer
• Robert Pine — Chief of Staff
• Derek Webster — Sky Crane Pilot
• Peter J. Lucas — Russian Reporter
• Elston Ridgle — Soldier