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| Cast |
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| William Henry Potts/Muller | HAY, Will |
| Krauss | USTINOV, Peter |
| Max | HAWTREY, Charles |
| professor Hoffmann | PETTINGELL, Frank |
| General von Klotz | MITCHELL, Julien |
| Hans | CROFT, Peter |
| Lena Schumann | FIRTH, Anne |
| Kurt | MORSE, Barry |
| Vogel | HARCOURT, Leslie |
| ADC | HAWK, Jeremy |
| Schmidt | LOVELL, Raymond |
| rector | MALLALIEU, Aubrey |
| major Bishop | WILLIAMS, John |
| Colonel Truscott | O'MADDEN, Laurence |
| [officer at train station] | HARTNELL, William |
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| Credits |
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| Director | HAY, Will |
| Director | DEARDEN, Basil |
| Production Company | Ealing Studios |
| Producer | BALCON, Michael |
| Associate Producer | BALCON, S.C. |
| Production Supervisor | CROYDON, John |
| Unit manager | MASON, Hal |
| Screenplay | MacPHAIL, Angus |
| Screenplay | DIGHTON, John |
| Based on an idea by | MILES, Bernard |
| Based on an idea by | GROVES, Reg |
| Photography | PALMER, Ernest |
| Music | BYRD, Bretton |
| Editor | PITT, Ray |
| Art Director | MORAHAN, Tom |
| Special Effects | KELLINO, Roy |
| Recording supervisor | WILLIAMS, Eric |
| Recording | PAGE, Len |
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