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Richard Dix as Richard 'Mack' McAllan |
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Leslie Banks as Frederick 'Robbie' Robbins |
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Madge Evans as Ruth McAllan |
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Helen Vinson as Varlia Lloyd |
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C. Aubrey Smith as Lloyd |
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Basil Sydney as Mostyn |
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Henry Oscar as Grellier |
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Hilda Trevelyan as Mary |
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Cyril Raymond as Harriman |
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Jimmy Hanley as Geoffrey McAllan |
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George Arliss as Prime Minister of Great Britain |
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Walter Huston as President of the United States |
| Directing | Maurice Elvey | Director |
| Costume & Make-Up | Marianne | Wardrobe Designer |
| Writing | Curt Siodmak | Screenstory |
| Writing | Bernhard Kellermann | Novel |
| Writing | L. du Garde Peach | Scenario Writer |
