Sobowtór
Simon to nieśmiały młody mężczyzna. W pracy jest niedoceniany, matka go gnębi, a kobieta jego marzeń nie dostrzega. Mimo to Simon czuje, że nie jest w stanie zmienić tych rzeczy. Przybycie nowego współpracownika, Jamesa, burzy spokój mężczyzny. James jest fizycznie podobny do Simona, ale stanowi jego całkowite przeciwieństwo.
Zwiastun
Obsada
Wallace Shawn
Mr. Papadopoulos
James Fox
The Colonel
Cathy Moriarty
Kiki
Phyllis Somerville
Simon's Mother
Susan Blommaert
Liz
Lukas DiSparrow
Resident (uncredited)
Jesse Eisenberg
Simon James / James Simon
Craig Roberts
Young Detective
Bruce Byron
Skinhead
Joanna Finata
Bar Girl (uncredited)
Steve Saunders
Moaning Man on Trolley (uncredited)
Gabrielle Downey
Strange Woman
Kobna Holdbrook-Smith
Guard / Doctor
Chris Morris
Workers' Services Executive
Danny
Singer (uncredited)
Natalia Warner
The Girl (uncredited)
Yasmin Paige
Melanie
Noah Taylor
Harris
Sally Hawkins
Receptionist at Ball
Rade Šerbedžija
Frightening Old Man (uncredited)
J. Mascis
Janitor
Tony Rohr
Rudolph
Andrew Gruen
Man on Train
Kim Noble
Box Man / Guard 1
Morrison Thomas
Coughing Man
Kierston Wareing
James' Funeral Date
Catherine Delaloye
Air Hostess (uncredited)
Tim Key
Care Worker
Paddy Considine
'The Replicator' - Jack
Gemma Chan
'The Replicator' - Glamourous Judge
Lydia Fox
Well-Dressed Woman at Ball / Test Invigilator
Daniel Chapple
Executive Worker (uncredited)
Nathalie Cox
'The Replicator' - Jack's Wife
Chris O'Dowd
Nurse
Mia Wasikowska
Hannah