Ed Stoppard
Alan Turing
Henry Goodman
Franz Greenbaum
Paul McGann
Himself - Narrator (voice)
A
Asa Briggs
Himself - Codebreaker, Bletchley Park
J
Jean Valentine
Herself - WRNS and Bombe Operator, Bletchley Park
D
David Leavitt
Himself - Alan Turing's Biographer
R
Rolf Noskwith
Himself - Codebreaker, Bletchley Park
D
Dermot Turing
Himself - Alan Turing's Nephew
C
Christopher Morcom
Himself - Christopher Morcom's Nephew (as Christopher Morcom QC)
Ian Stewart
Himself - University of Warwick (as Professor Ian Stewart)