Alan Turing
Ed Stoppard
Franz Greenbaum
Henry Goodman
Himself - Narrator (voice)
Paul McGann
Himself - Codebreaker, Bletchley Park
Asa Briggs
Herself - WRNS and Bombe Operator, Bletchley Park
Jean Valentine
Himself - Alan Turing's Biographer
David Leavitt
Rolf Noskwith
Himself - Alan Turing's Nephew
Dermot Turing
Himself - Christopher Morcom's Nephew (as Christopher Morcom QC)
Christopher Morcom
Himself - University of Warwick (as Professor Ian Stewart)
Ian Stewart
Executive Producer
Paul Sen
Director of Photography
Andy Jackson
Producer
Clare Beavan
Director
Writer
Craig Warner
Music
Edward White
Patrick Sammon
Rob Goldie
Jennifer Beamish
Ryan Greenawalt
Nic Stacey