Keanu Reeves Klaatu
Jennifer Connelly Helen Benson
Kyle Chandler John Driscoll
Jon Hamm Michael Granier
James Hong Mr. Wu
John Cleese Professor Barnhardt
Jaden Smith Jacob Benson
Kathy Bates Regina Jackson
Robert Knepper Colonel
Brandon T. Jackson Target Tech
Scott Derrickson Director
Ben Cotton Truck Driver
Roger Cross General Quinn
Jake McLaughlin Soldier
Hiro Kanagawa Dr. Ikegawa
Patrick Sabongui Soldier #1
John Rothman Dr. Myron
Ty Olsson Flash Chamber Colonel
J.C. MacKenzie Grossman
Bill Mondy Helicopter Scientist #2
Lorena Gale Scientist #2
Marci T. House Medic #3
Richard Keats Helicopter Scientist #1
Michael Hogan General
Darien Provost Little Boy
Joshua Close Flash Chamber Engineer
Geoff Meed Field Commander Communications Officer
Daniel Bacon Winslow
Serge Houde Scientist #1
Andrew Wheeler Guardsman
Jacob Blair Soldier #2
Ken Kirzinger Arguing Evacuee
Leanne Adachi Flash Chamber Tech
Stefanie Samuels Guardswoman
David Richmond-Peck Polygraph Operator
Matt Adler (voice)
Heather Doerksen Regina's Aide
Buddy Joe Hooker Stunts
Dean Redman Military Policeman
Rukiya Bernard Student
Doug Chapman Medic #2
Jeff Dashnaw Stunts
Reese Alexander Sergeant
Brian Avery Stunts
Laura Lee Connery Stunts
Dane A. Davis Sound Designer, Supervising Sound Editor
George Sharperson Cop
Tracey Wilson Storyboard Artist
Tyler Bates Original Music Composer
Mousa Kraish Yusef
Joann Fowler Makeup Artist
Mindy Marin Casting
Erick Geisler Visual Effects Producer
Gregg Landaker Sound Re-Recording Mixer
Wayne D. Barlowe Concept Artist
Richard Tillman Army Sergeant
Brian Machleit Stunt Coordinator
Aaron Au Stunts
Aaron Craven Technician
Hugo Steele Stunts
Wayne Wahrman Editor
Fraser Aitcheson Stunts
Matsune Suzuki Modeling
Charleen Richards-Steeves ADR Mixer
Melissa R. Stubbs Stunts
Erwin Stoff Producer
David Lucarelli ADR Recordist
Paul Story Lead Animator
Brad Dryborough Train Passenger #2
Kurt Max Runte Civil Engineer
Dawn Chubai News Anchor
Laura Graham ADR Editor