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Nils Olaf Chrisander as Greve de Faber - Sprängämnesexpert |
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Maja Cassel as Mary Plussman |
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Manne Göthson as C.J. Plussman - Professor |
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Arvid Hammarlund as Doctor Johnson |
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Gustaf Bengtsson as De Fabers medhjälpare i båten / Medhjälpare på Karlstens fästning |
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Victor Arfvidson as Berger - Fästningsförvaltare |
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Lilly Cronwin as Ung dam som ringer polisen |
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Frans Oskar Öberg as De Fabers utländska kompanjon |
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Anna Löfström as Äldre dam som ringer polisen |
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Siri Lundin as Professor Plussmans tjänsteflicka |
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William Engeström as Fiskaren |
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Hugo Björne as student |
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Sture Baude as student |
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Gabriel Alw as student |
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Eleonor de Floer as Flickan |
| Directing | Georg af Klercker | Director |
| Camera | Gösta Stäring | Director of Photography |
| Directing | Manne Göthson | Assistant Director |
| Writing | Willy Grebst | Writer |
| Writing | Georg af Klercker | Writer |
