Ηθοποιοί

• Benedict Cumberbatch — Alan Turing
• Keira Knightley — Joan Clarke
• Matthew Goode — Hugh Alexander
• Rory Kinnear — Detective Robert Nock
• Allen Leech — John Cairncross
• Matthew Beard — Peter Hilton
• Charles Dance — Commander Denniston
• Mark Strong — Stewart Menzies
• Steven Waddington — Superintendent Smith
• Jack Tarlton — Charles Richards
• Alex Lawther — Young Alan Turing
• Jack Bannon — Christopher Morcom
• Tuppence Middleton — Helen
• Victoria Wicks — Joan's Mother
• Miranda Bell — Margaret
• Tom Goodman-Hill — Sergeant Staehl
• Andrew Havill — Teacher
• Laurence Kennedy — Headmaster