Zac Efron
Richard Samuels
Christian McKay
Orson Welles
Claire Danes
Sonja Jones
Ben Chaplin
George Coulouris
Zoe Kazan
Gretta Alder
Eddie Marsan
John Houseman
Kelly Reilly
Muriel Brassler
James Tupper
Joseph Cotten
Leo Bill
Norman Lloyd
Patrick Kennedy
Grover Burgess
Aidan McArdle
Martin Gabel
Al Weaver
Sam Leve
Thomas Arnold
George Duthie
Megan Maczko
Evelyn Allen
Jo McInnes
Jeannie Rosenthal
Iain McKee
Vakhtangov
Simon Nehan
Joe Holland
Travis Oliver
John Hoyt
Simon Lee Phillips
Walter Ash
Daniel Tuite
William Mowry
Imogen Poots
Lorelei Lathrop
Saskia Reeves
Barbara Luddy
Shane James Bordas
Conspirator
Alessandro Giuggioli
Conspirator
Harry Macqueen
Conspirator
Rhodri Orders
Conspirator
Michael J. McEvoy
Epstein
Garrick Hagon
Dr. Mewling
Aaron Brown
Longchamps Kid #1
Emily Allen
Virginia Welles
David Garbutt
Mercury French Horn Player
Jay Irving
Mercury Percussion Player
Steven Parry
Mercury Trumpet Player
Marlene Sidaway
Grandmother Samuels
Robert Wilfort
Radio Director
Michael Brandon
Les Tremayne
Nathan Osgood
Radio Announcer
Janie Dee
Mrs. Samuels
Eddi Reader
Singer
Jools Holland
Band Leader
Gilson Lavis
Drummer
Dave Swift
Double Bass
Mark Flanagan
Guitar
Fayyaz Virji
Trombone
Michael Rose
Tenor Sax
Phil Veacock
Alto Sax & Clarinet
Nick Lunt
Baritone Sax
Jason McDermid
Trumpet
John Young
Longchamps Kid #2
Greg Bennett
Hobo
Cris Blanco
Museum Patron (uncredited)
Lexie Lambert
Lizzy (uncredited)
John Patten
Theatre Owner (uncredited)
Chris Wilson
Studion Foley Artist (uncredited)