Keanu Reeves

(Klaatu)

Jennifer Connelly

(Dr. Helen Benson)

Kathy Bates

(Regina Jackson)

Jaden Smith

(Jacob Benson)

John Cleese

(Professor Barnhardt)

Jon Hamm

(Michael Granier)

Kyle Chandler

(John Driscoll)

Robert Knepper

(Colonel)

James Hong

(Mr. Wu)

John Rothman

(Dr. Myron)

Sunita Prasad

(Rouhani)

Juan Riedinger

(William Kwan)

Sam Gilroy

(Tom)

Tanya Champoux

(Isabel)