Klaatu

Keanu Reeves

Dr. Helen Benson

Jennifer Connelly

Regina Jackson

Kathy Bates

Jacob Benson

Jaden Smith

Michael Granier

Jon Hamm

Professor Barnhardt

John Cleese

John Driscoll

Kyle Chandler

Colonel

Robert Knepper

Mr. Wu

James Hong

Target Tech

Brandon T. Jackson

Dr. Myron

John Rothman

Rouhani

Sunita Prasad

Soldier

Jake McLaughlin

William Kwan

Juan Riedinger

Tom

Sam Gilroy

Isabel

Tanya Champoux

Student

Rukiya Bernard

Laptop Woman

Alisen Down

Plainclothes Agent

David Lewis

Agent Driver

Lloyd Adams

Yusef

Mousa Kraish

Grossman

J. C. MacKenzie

Grossman

J.C. MacKenzie

Winslow

Daniel Bacon

Civil Engineer

Kurt Max Runte

Helicopter Scientist #1

Richard Keats

Helicopter Scientist #2

Bill Mondy

Sergeant

Reese Alexander

Helicopter Scientist #3

Judith Maxie

Scientist #1

Serge Houde

Scientist #2

Lorena Gale

Guardswoman

Stefanie Samuels

NYPD #1

Camille Atebe

Army Sergeant

Richard Tillman

NYPD #2

Thomas Bradshaw

NYPD #3

Terence Dament

Soldier #1

Patrick Sabongui

Soldier #2

Jacob Blair

Soldier #3

Shaine Jones

Cop

George Sharperson

Medic #1

Shaker Paleja

Medic #2

Douglas Chapman

Medic #1

Shekhar Paleja

Medic #3

Marci T. House

Technician

Aaron Craven

General Quinn

Roger Cross

Regina's Aide

Heather Doerksen

Dr. Ikegawa

Hiro Kanagawa

Grey Man

Craig Stanghetta

Grey Man

Stefan Busse

Military Policeman

Dean Redman

Polygraph Operator

David Richmond-Peck

Guardsman

Andrew Wheeler

Little Boy

Darien Provost

Train Passenger #1

Daniel St. Andrews

Train Passenger #2

Brad Dryborough

Arguing Evacuee

Ken Kirzinger

Transit Cop

William 'Big Sleeps' Stewart

Army Fighter Pilot #1

Blair Redford

Army Fighter Pilot #2

Daniel Wisler

Air Traffic Controller

Mark Kogan

Wu's Grandson

Ed Fong

Army Corps Engineer Captain

Sandy Colton

Flash Chamber Colonel

Ty Olsson

State Trooper

Jay-Nicolas Hackleman

News Anchor

Dawn Chubai

Flash Chamber Engineer

Joshua Close

Flash Chamber Tech

Leanne Adachi

Field Commander Communications Officer

Geoff Meed

General

Michael Hogan

Truck Driver

Ben Cotton

Pickup Truck Driver

Kevan Kase

Humvee Soldier

Josue Aguirre

(voice)

Matt Adler