演职人员
Himself - Narrator
史蒂文·麦金托什
Gordon Welchman (voice)
Brian Deacon
Herself - Gordon Welchman's Daughter
Rosamund Welchman
Himself - Ex-Head of Hut 6, Bletchley Park (1939-1941) (archive footage)
W. Gordon Welchman
Himself - Author, 'The Secret Life of Bletchley Park'
Sinclair McKay
Himself - Veteran, Hut 6
Jimmy Thirsk
Himself - Veteran, Hut 6
Asa Briggs
Herself - Veteran, Hut 6
Jane Fawcett
Himself - GCHQ Historian and Former Analyst
Tony Comer
Himself - Vice President, Wolfson College, Cambridge (as Prof John Naughton)
John Naughton
Himself - Chairman, Bletchley Park Trust, and Former Chief, MI6 (as Sir John Scarlett KCMG OBE)
John Scarlett
Herself - Gordon Welchman's Granddaughter
Jennifer Welchman
Himself - Former President, The MITRE Corporation
Robert R. Everett
Himself - Gordon Welchman's Colleague
Eric Ellingson
Himself - Gordon Welchman's Colleague
Larry Hill