Will Smith

Capt. Steven Hiller

Bill Pullman

President Thomas J. Whitmore

Jeff Goldblum

David Levinson

Mary McDonnell

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

Lisa Jakub

Alicia

Ross Bagley

Dylan

Mae Whitman

Patricia Whitmore

Bill Smitrovich

Captain Watson

Kiersten Warren

Tiffany

Harry Connick Jr.

Capt. Jimmy Wilder

Giuseppe Andrews

Troy

John Storey

Dr. Isaacs

Frank Novak

Teddy

Devon Gummersall

Philip

Leland Orser

Techy / Med Asst #1

Mirron E. Willis

Aide

Ross Lacy

Aide

David Pressman

Whitmore's Aide

Vivian Palermo

Tech / Med Asst

Raphael Sbarge

Commander / Tech

Bobby Hosea

Commanding Officer

Dan Lauria

Commanding Officer

Steve Giannelli

Radar Tech

Eric Paskel

Radar Tech

Carlos Lacámara

Radar Operator

John Bennett Perry

Secret Serviceman

Troy Willis

Secret Serviceman

Tim Kelleher

Technician

Wayne Wilderson

Area 51 Technician

Jay Acovone

Area 51 Guard

James Wong

SETI Tech One

Thom Barry

SETI Tech Two

Jana Marie Hupp

SETI Tech Three

Marisa Johnston

Co-Worker #2

Michael Winther

Co-Worker #3

John Capodice

Mario

Greg Collins

Military Aide

Derek Webster

Sky Crane Pilot

Mark Fite

Pilot

ლევან უჩანეიშვილი

Russian Pilot

Kristof Konrad

Russian Pilot

Elston Ridgle

Soldier

Randy Oglesby

Mechanic

Jack Moore

Mechanic

Barry Del Sherman

Street Preacher

Lyman Ward

Secret Service Guy

Anthony Crivello

Lincoln

Richard Speight Jr.

Ed

Sharon Tay

Reporter

Peter J. Lucas

Russian Reporter

Johnny Kim

Korean Newscaster

Ron Pitts

Video Newscaster

Ernie Anastos

Rex Black / NY Newscaster

Kevin Cooney

Atlantic Air CINC

Rance Howard

Chaplain

Nelson Mashita

Japanese Tech

Sayed Badreya

Arab Pilot

Adam Tomei

Sailor

Kimberly Beck

Housewife

Thomas F. Duffy

Lieutenant

Andrew Keegan

Older Boy

Jim Piddock

Reginald

Eleanor Clift

Self

Jerry Dunphy

Self

Barry Nolan

Self

Pat Skipper

Redneck

Mike Monteleone

Butler

Malcolm Danare

Intellectual on Roof

Arthur Brooks

Trucker on Roof

Joyce Cohen

Kim Peters (Reporter)

Julie Moran

Entertainment Tonight Reporter

Gary A. Hecker

Alien Vocal Effects (voice)

Frank Welker

Special Vocal Effects (voice)