Jesse Eisenberg

Simon James / James Simon

Wallace Shawn

Mr. Papadopoulos

Richard Ayoade

Director

Michael Caine

Executive Producer

Noah Taylor

Harris

Jon Korkes

Detective

J. Mascis

Janitor

Tessa Ross

Executive Producer

Kobna Holdbrook-Smith

Guard / Doctor

Cathy Moriarty

Kiki

James Fox

The Colonel

Sally Hawkins

Receptionist at Ball

Phyllis Somerville

Simon's Mother

Mia Wasikowska

Hannah

Tim Key

Care Worker

Craig Roberts

Young Detective

Gabrielle Downey

Strange Woman

Susan Blommaert

Liz

Tony Rohr

Rudolph

Bruce Byron

Skinhead

Yasmin Paige

Melanie

Lydia Fox

Well-Dressed Woman at Ball / Test Invigilator

Karima Riachy

Secretary

Andrew Gruen

Man on Train

Kim Noble

Box Man / Guard 1

Morrison Thomas

Coughing Man

Lloyd Woolf

Investigator

Avi Korine

Writer

Graeme Cox

Executive Producer