|
| Will Smith | ... | Captain Steven Hiller |
| Bill Pullman | ... | President Thomas J. Whit |
| Jeff Goldblum | ... | David Levinson |
| Mary McDonnell | ... | First Lady Marilyn Whit |
| Judd Hirsch | ... | Julius Levinson |
| Robert Loggia | ... | General William Grey |
| Randy Quaid | ... | Russell Casse |
| Margaret Colin | ... | Constance Spano |
| Vivica A. Fox | ... | Jasmine Dubrow |
| James Rebhorn | ... | Albert Nimzicki |
| Harvey Fierstein | ... | Marty Gilbert |
| Adam Baldwin | ... | Major Mitchell |
| Brent Spiner | ... | Dr. Brackish Okun |
| James Duval | ... | Miguel Casse |
| Lisa Jakub | ... | Alicia Casse |
| Giuseppe Andrews | ... | Troy Casse |
| Ross Bagley | ... | Dylan Dubrow |
| Bill Smitrovich | ... | Lt. Colonel Watson |
| Mae Whitman | ... | Patricia Whit |
| Harry Connick Jr. | ... | Captain Jimmy Wilder |
| Kiersten Warren | ... | Tiffany |
| John Storey | ... | Dr. Isaacs |
| Frank Novak | ... | Teddy |
| Devon Gummersall | ... | Philip |
| Leland Orser | ... | Tech / Medical Assistant #1 |
| Mirron E. Willis | ... | Aide |
| Ross Lacy | ... | Aide |
| David Pressman | ... | Alex, Aide to President Whit |
| Vivian Palermo | ... | Tech / Medical Assistant #2 |
| Raphael Sbarge | ... | Commander / Tech |
| Bobby Hosea | ... | Major Danowitz |
| Dan Lauria | ... | Commanding Officer |
| Steve Giannelli | ... | Radar Tech |
| Eric Paskel | ... | Radar Tech |
| Carlos Lacamara | ... | Radar Operator (as Carlos LaCamara) |
| John Bennett Perry | ... | Secret Service Agent |
| Troy Willis | ... | Secret Service Agent |
| Tim Kelleher | ... | Technician |
| Wayne Wilderson | ... | Area 51 Technician |
| Jay Acovone | ... | Area 51 Guard |
| James Wong | ... | SETI Technician #1 |
| Thom Barry | ... | SETI Technician #2 |
| Jana Marie Hupp | ... | SETI Technician #3 |
| Matt Pashkow | ... | Officer #2 |
| Robert Pine | ... | Chief of Staff Glenn Parness |
| Marisa Johnston | ... | Co-Worker #2 (as Marisa Morell) |
| Michael Winther | ... | Co-Worker #3 |
| Dexter Warren | ... | Co-Worker #4 |
| Paul LeClair | ... | Co-Worker #5 |
| Michael Vacca | ... | Lieutenant Peterson (as Capt. Michael 'Chewy' Vacca) |
| David Chanel | ... | Secret Service Agent |
| John Capodice | ... | Mario |
| Greg Collins | ... | Military Aide |
| Derek Webster | ... | Sky Crane Pilot |
| Mark Fite | ... | Pilot |
| Eric Neal Newman | ... | Pilot |
| Levan Uchaneishvili | ... | Russian Pilot (as Levani) |
| Kristof Konrad | ... | Russian Pilot |
| Kevin Sifuentes | ... | Tank Commander |
| Elston Ridgle | ... | Soldier |
| Randy Oglesby | ... | Mike Dodge |
| Jack Moore | ... | Stoney Jackson |
| Barry Del Sherman | ... | Street Preacher |
| Lyman Ward | ... | Secret Service Agent |
| Anthony Crivello | ... | Lincoln |
| Richard Speight Jr. | ... | Ed |
| Barbara Beck | ... | Monica Soloway |
| Joe Fowler | ... | Reporter |
| Andrew Warne | ... | Reporter |
| Sharon Tay | ... | Reporter |
| Peter J. Lucas | ... | Russian Reporter (as Peter Jozef Lucas) |
| Yelena Danova | ... | Russian Newscaster |
| Johnny Kim | ... | Korean Newscaster (as Derek Kim) |
| Vanessa J. Wells | ... | Newscaster |
| Jessika Cardinahl | ... | German Video Newscaster (scenes deleted) |
| Gary W. Cruz | ... | Video Newscaster |
| Ron Pitts | ... | Video Newscaster |
| Wendy L. Walsh | ... | Herself |
| Christine Devine | ... | Video Newscaster |
| Mark Thompson | ... | Video Newscaster |
| Ernie Anastos | ... | Rex Black, New York Newscaster |
| Kevin Cooney | ... | Atlantic Air CINC |
| Rance Howard | ... | Chaplain |
| Nelson Mashita | ... | Japanese Tech |
| Jeff Phillips | ... | B-2 Pilot |
| Sayed Badreya | ... | Arab Pilot |
| Adam Tomei | ... | Sailor |
| John Bradley | ... | Lucas |
| Kimberly Beck | ... | Housewife |
| Thomas F. Duffy | ... | Lieutenant |
| Andrew Keegan | ... | Older Boy |
| Jon Matthews | ... | Thomson |
| Jim Piddock | ... | Reginald |
| Frederic W. Barnes | ... | Himself (as Fred Barnes) |
| Eleanor Clift | ... | Herself |
| Jerry Dunphy | ... | Himself |
| Jack Germond | ... | Himself |
| Morton Kondracke | ... | Himself |
| John McLaughlin | ... | Himself |
| Barry Nolan | ... | Himself |
| George Putnam | ... | Himself |
| Eric Michael Zee | ... | Northridge Field Reporter |
| Pat Skipper | ... | Redneck |
| Carlos Lara | ... | Farmer Kid |
| Mike Monteleone | ... | Butler |
| Lee Strauss | ... | Elvis Fanatic |
| Lisa Star | ... | Woman on Roof |
| Malcolm Danare | ... | Intellectual on Roof |
| Arthur Brooks | ... | Trucker on Roof |
| Michael Moertl | ... | Thief (as Michael G. Moertl) |
| James J. Joyce | ... | Master CPO |
| Joyce Cohen | ... | Kim Peters |
| Julie Moran | ... | Herself - 'Entertainment Tonight' Reporter |
| Robin Groth | ... | Flagstaff News Anchor |
| Richard Pachorek | ... | LAPD Helicopter Pilot |
| Gary A. Hecker | ... | Alien Vocal Effects (voice) (as Gary Hecker) |
| Frank Welker | ... | Special Vocal Effects (voice) |
|
| Jonathan Adler | ... | Secret Service Agent (uncredited) |
| Erick Avari | ... | SETI Chief (uncredited) |
| Greg Bronson | ... | Police Officer at White House (uncredited) |
| Dean Devlin | ... | Eagle 2 Pilot (uncredited) |
| Daren Dochterman | ... | British News Translator (uncredited) |
| Volker Engel | ... | Man in Office (uncredited) |
| Bob Friend | ... | Himself - 'Sky News' Anchorman (uncredited) |
| Jeffrey Gold | ... | German Fighter Pilot (uncredited) |
| Michael Haddad | ... | Trailer Trash (uncredited) |
| Lincoln D. Hiatt | ... | Colin Barclay (uncredited) |
| Jonathan Khan | ... | Pilot (uncredited) |
| Darin Mangan | ... | Staff sergeant (uncredited) |
| Scott McKinley | ... | Joint Chiefs of Staff (uncredited) |
| Bryan D. Moss | ... | Israeli Fighter Pilot (uncredited) |
| Roy Newton | ... | Pilot (uncredited) |
| Gary Pike | ... | Helicopter Passenger (uncredited) |
| Darla Rae | ... | Protestor - Omni Hotel (uncredited) |
| Nectar Rose | ... | Stripper (uncredited) |
| Bonnie Silco | ... | Bride (uncredited) |
| Tadao Tomomatsu | ... | Big Hat Guy on Tower (uncredited) |
| Michael A. Valenzano | ... | Young Pilot (uncredited) |
| Tracey Walter | ... | Area 51 Lab Technician (uncredited) |
| James With | ... | British Pilot (uncredited) |
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