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as Young Alan Turing
as John Cairncross
as Teacher
as Alan Turing
as Commander Denniston
as Sherborne Student 3
as Joan's Father
as Sherborne Student 1
as Keith Furman
as Christopher Morcom
as Charles Richards
as Sherborne Student 2
as Jack Good
as Joan Clarke
as Headmaster
as Stewart Menzies
as Peter Hilton
as Hugh Alexander
as Margaret
as Detective Robert Nock
as Superintendent Smith
as Electrical Assistant
as MI6 Agent
as Sergeant Staehl
as Helen
as Joan's Mother
as Military Policeman