Keanu Reeves Klaatu
John Cleese Professor Barnhardt
Jennifer Connelly Helen Benson
Jon Hamm Michael Granier
Robert Knepper Colonel
J.C. MacKenzie Grossman
Kurt Max Runte Civil Engineer
Kyle Chandler John Driscoll
James Hong Mr. Wu
Kathy Bates Regina Jackson
Ben Cotton Truck Driver
Jaden Smith Jacob Benson
Jeffrey A. Okun Visual Effects Supervisor
Gil Forrester Dolly Grip
Ty Olsson Flash Chamber Colonel
Jeff Dashnaw Stunts
Carrick O'Quinn Stunts
Jake McLaughlin Soldier
Marci T. House Medic #3
Thomas F. Ford IV Visual Effects Producer
Brandon T. Jackson Target Tech
Charleen Richards-Steeves ADR Mixer
David A. Whittaker Sound Editor
Bill Mondy Helicopter Scientist #2
J.J. Makaro Stunt Coordinator
Pete Turner Stunt Double
Richard Keats Helicopter Scientist #1
Arun Ram-Mohan Lighting Artist
Roger Cross General Quinn
Douglas Dean III Second Unit First Assistant Director
Patrick Sabongui Soldier #1
Andrew Wheeler Guardsman
John L. Healy Makeup Artist
Gary Burritt Negative Cutter
Leanne Adachi Flash Chamber Tech
Hiro Kanagawa Dr. Ikegawa
Francisco X. Pérez Makeup Artist
Stefanie Samuels Guardswoman
John Rothman Dr. Myron
Chun Seong Ng Modeling
Martha Pike Digital Intermediate Editor
Dane A. Davis Sound Designer, Supervising Sound Editor
Bonnie Clevering Hairstylist
Melissa R. Stubbs Stunts
Wayne D. Barlowe Concept Artist
Scott Derrickson Director
David Richmond-Peck Polygraph Operator
Bill R. Dean Supervising Sound Editor
Serge Houde Scientist #1
Norma Hill-Patton Key Makeup Artist
Blake R. Cornett Sound Recordist
Michael Hogan General
Doug Chapman Medic #2
Stephen S. Campanelli Camera Operator
Sean M. Harding First Assistant Camera
Matthew D. Smith Second Assistant Director
Marc-André Guindon Pre-Visualization Supervisor
George Sharperson Cop
Ken Kirzinger Arguing Evacuee
Gregg Landaker Sound Re-Recording Mixer
Joann Fowler Makeup Artist
Hans Bjerno Aerial Director of Photography
Reese Alexander Sergeant
Nickolas Baric Stunts
Steve M. Davison Stunt Coordinator
Allan A. Apone Makeup Department Head
Buddy Joe Hooker Stunts
Erick Geisler Visual Effects Producer
Richard Tillman Army Sergeant
Ian C. Ballard Key Hair Stylist
Frédéric North Pilot
Matt Adler (voice)