Christopher Morcom
Superintendent Smith
Joan Clarke
Alan Turing
Stewart Menzies
Detective Robert Nock
Commander Denniston
Hugh Alexander
Helen
John Cairncross
Young Alan Turing
Sergeant Staehl
Charles Richards
Passerby (uncredited)
Sherborne Student 3
Assistant Wren (uncredited)
Jack Good
Joan's Mother
Sherborne Student 2
Evacuee (uncredited)
Headmaster
Teacher
Wren (uncredited)
Crossword Man (uncredited)
MI6 Agent (uncredited)
Joan's Father
Joan Clarke's Friend (uncredited)
Wren (uncredited)
Nunn (uncredited)
Military Police (uncredited)
MI6 Agent (uncredited)
Bletchley Park Agent (uncredited)
Peter Hilton
Keith Furman
Evacuee (uncredited)
Technician (uncredited)
Dancer (uncredited)
Wren (uncredited)
Joan Clarke's Friend (uncredited)
Crossword Enthusiast
Paperboy (uncredited)
Police Sergeant White (uncredited)
Civilian (uncredited)
Sherborne Student 1
WW2 Wren (uncredited)
Wren (uncredited)
Evacuee (uncredited)
Woman in Crowd (uncredited)
Dancer (uncredited)
School Boy (uncredited)
Young Officer (uncredited)
German Pilot (uncredited)
RAF Wren (uncredited)
Passerby (uncredited)
MI6 Agent (uncredited)
MI6 Agent (uncredited)
Crossword Enthusiast (uncredited)
Ministry Man (uncredited)
First Aid Nurse (uncredited)
Crossword Man in Pub (uncredited)
Military Policeman 3 (uncredited)
Bletchley Park Operative (uncredited)
MI6 Agent (uncredited)
Military Policeman (as Will Bowden), Military Policeman
MI6 Agent
Margaret
Electrical Assistant
Evacuee (uncredited)
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