 | Derek Jacobi als Alan Turing |
 | Alun Armstrong als Mick Ross |
 | Blake Ritson als Christopher Morcom |
 | Prunella Scales als Sara Turing |
 | Harold Pinter als John Smith |
 | Julian Kerridge als Ron Miller |
 | Richard Johnson als Dilwyn 'Dilly' Knox |
 | Amanda Root als Patricia 'Pat' Green |
 | William Mannering als Young Alan Turing |
| Herbert Wise | Director |
| Andrew Hodges | Book |
| Hugh Whitemore | Writer |
| Rebecca Eaton | Executive Producer |
| John Drury | Executive Producer |
| Jack Emery | Producer |
| Richard Langridge | Executive Producer |
| Andrew Rowley | Producer |
| Robin Vidgeon | Director of Photography |
| Laurence Méry-Clark | Editor |
| Pippa Ailion | Casting |
| Barbara Gosnold | Production Design |
| Fiona McNeill | Art Direction |
| Frances Tempest | Costume Design |
| Kate Benton | Makeup Artist |
| Kate Hodgson | Makeup Artist |
| Pam Meager | Makeup Designer |
| Philip Alton | Sound Editor |
| Maurice Hillier | Sound Recordist |
