George Clooney
Chris Kelvin
Natascha McElhone
Rheya
Viola Davis
Gordon
Jeremy Davies
Snow
Ulrich Tukur
Gibarian
Michael Ensign
Friend
John Cho
DBA Emissary
Morgan Rusler
DBA Emissary
Shane Skelton
Gibarian's Son
Donna Kimball
Mrs. Gibarian
Elpidia Carrillo
Friend
Kent Faulcon
Patient
Lauren Cohn
Patient
Jennie Baek
Passenger (uncredited)
Tony Clemons
Dinner Guest (uncredited)
Dale Hawes
Pedestrian (uncredited)
Annie Morgan
Nurse (uncredited)
Antonio Rochira
Party Guest (uncredited)
Jude S. Walko
City Dweller (uncredited)