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| Cast |
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| Professor Horatio Smith | HOWARD, Leslie |
| General von Graum | SULLIVAN, Francis |
| Ludmilla Koslowski | MORRIS, Mary |
| David Maxwell | McDERMOTT, Hugh |
| Marx | HUNTLEY, Raymond |
| Bertie Gregson | WHILEY, Manning |
| Sidimir Koslowski | GAWTHORNE, Peter |
| Dr Benckendorf | JEAYES, Allan |
| Hoffman | ARUNDELL, Dennis |
| schoolteacher | KEMP-WELCH, Joan |
| Spencer | FRIEND, Philip |
| Clarence Elstead | KITCHEN, Lawrence |
| Steve | TOMLINSON, David |
| Jock MacIntyre | APPLEBY, Basil |
| Dvorak | WALSH, Percy |
| salesgirl | CLAIRE, Suzanne |
| Sir George Smith, embassy offic | PERTWEE, Roland |
| Steinhof | PATON, Charles |
| dean | MALLALIEU, Aubrey |
| Schmidt | STREET, George |
| Lady Willoughby | ROSS, Oriel |
| Earl of Meadowbrook | MATTHEWS, A.E. |
| Jaromir | HERBERT, Brian |
| Jordan | HAMBLING, Arthur |
| Graubitz | WILLIAMS, Ben |
| Weber | BUTCHER, Ernest |
| girl student | BROWN, Mary |
| innkeeper | PHILLIPS, W. |
| Gretchen | BARD, Ilse |
| German officer | VERNE, Ernest |
| Karl Meyer | ABBAS, Hector |
| second prisoner | ARDEN, Neal |
| prison guard | GEORGE, Richard |
| Zigor | HUGHES, Roddy |
| Wagner | PRYCE, Hwfa |
| reporter (uncredited) | SLATER, John |
| officer at concentration camp (uncredited) | RENNIE, Michael |
| shop assistant (uncredited) | CUNNINGTON, Violete |
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| Credits |
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| Director | HOWARD, Leslie |
| Production Company | British National Films |
| Producer | HOWARD, Leslie |
| Associate Producer | HUTH, Harold |
| Production Manager | SAMUEL, Phil C. |
| Assistant Director | POLLOCK, George |
| Casting (uncredited) | HOWARD, Irene |
| Screenplay and Scenario | DE GRUNWALD, Anatole |
| Scenario | PERTWEE, Roland |
| Based on an original story by | MacDONELL, A.G. |
| | WILHELM, Wolfgang |
| Photography | GREENBAUM, Mutz |
| Camera Operator | HILDYARD, Jack |
| Supervising Editor | COLE, Sidney |
| Editor | MYERS, Douglas |
| Settings | SUTHERLAND, Duncan |
| Assistant Art Director (uncredited) | RICHARDS, Ward |
| Make-up (uncredited) | RODWAY, Geoffrey |
| Music | GREENWOOD, John |
| Music Director | MATHIESON, Muir |
| Sound Supervisor | WATKINS, A.W. |
| Recordist | DENNIS, John |
| Technical Supervisor | GREENBAUM, Mutz |
| Studio | Denham Studios |
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