cast
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Jesse Eisenberg
Simon James / James Simon
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Mia Wasikowska
Hannah
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Wallace Shawn
Mr. Papadopoulos
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Yasmin Paige
Melanie
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Noah Taylor
Harris
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James Fox
The Colonel
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Cathy Moriarty
Kiki
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Phyllis Somerville
Simon's Mother
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Gabrielle Downey
Strange Woman
- Jon Korkes Detective
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Craig Roberts
Young Detective
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Kobna Holdbrook-Smith
Guard / Doctor
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Susan Blommaert
Liz
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Bruce Byron
Skinhead
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J. Mascis
Janitor
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Tony Rohr
Rudolph
- Karima Riachy Secretary
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Tim Key
Care Worker
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Andrew Gruen
Man on Train
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Kim Noble
Box Man / Guard 1
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Morrison Thomas
Coughing Man
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Sally Hawkins
Receptionist at Ball
- Lloyd Woolf Investigator
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Lydia Fox
Well-Dressed Woman at Ball / Test Invigilator
- Stuart Silver Waiter / 'The Replicator' - Guard 2
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Chris Morris
Workers' Services Executive
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Chris O'Dowd
Nurse
- Donal Cox Priest
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Kierston Wareing
James' Funeral Date
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Paddy Considine
'The Replicator' - Jack
- Dirk Van Der Gert 'The Replicator' - Head Judge
- Liam Bewley 'The Replicator' - Wise Judge
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Gemma Chan
'The Replicator' - Glamourous Judge
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Nathalie Cox
'The Replicator' - Jack's Wife
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Daniel Chapple
Executive Worker (uncredited)
- Martin Crossingham Paramedic (uncredited)
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Danny
Singer (uncredited)
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Catherine Delaloye
Air Hostess (uncredited)
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Lukas DiSparrow
Resident (uncredited)
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Joanna Finata
Bar Girl (uncredited)
- Jeanie Gold Waitress (uncredited)
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Steve Saunders
Moaning Man on Trolley (uncredited)
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Rade Šerbedžija
Frightening Old Man (uncredited)
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Natalia Warner
The Girl (uncredited)