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George Murphy as Inspector James 'Jim' Belden |
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Finlay Currie as Professor Albert Kafer |
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Virginia Gilmore as Millie / Teresa Zalenko |
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Karl Stepanek as Alexi Laschenkov / Gregory Anders |
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Louisa Horton as Mrs. Elaine Wilben |
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Peter Capell as Chris Zalenko / Gino |
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Bruno Wick as Luther Danzig |
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Vilma Kurer as Mrs. Rita Foss |
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Ann Thomas as Philadelphia Suspect |
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George Roy Hill as Nicholas Wilben |
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Karl Weber as FBI Agent Charlie Reynolds |
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Michael Garrett as Michael Dorndoff aka Frank Torrance |
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Lotte Palfi Andor as Anna Kafer |
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Ernest Graves as Robert Martin |
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Robert Carroll as Boldany |
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Wolfgang Zilzer as August Helmuth |
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Bradford Hatton as Harry Mason |
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Rosemary Pettit as Mrs. Martin |
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Eva Condon as Landlady |
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Steve Mitchell as Samson |
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John Farrell as Taxi Driver (uncredited) |
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Nancy Hale as Mrs. Belden (uncredited) |
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Westbrook Van Voorhis as Narrator (voice) (uncredited) |
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Mary Young as Old Lady (uncredited) |
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Suzanne Moulton as Sherry Belden (uncredited) |
| Sound | Louis Applebaum | Original Music Composer |
| Writing | Leo Rosten | Story |
| Directing | Alfred L. Werker | Director |
| Writing | Leo Rosten | Screenplay |
| Production | Louis De Rochemont | Producer |
| Editing | Angelo Ross | Editor |
| Camera | Joseph C. Brun | Director of Photography |
| Art | Herbert Andrews | Art Direction |
| Camera | George Stoetzel | Camera Operator |
| Production | Lothar Wolff | Associate Producer |
| Production | Thomas Whitesell | Unit Manager |
| Sound | Jack Shaindlin | Music Director |
| Sound | Lodge Cunningham | Sound |
| Production | Shirlee Weingarten | Casting Director |
| Editing | Peter Ratkevich | Assistant Editor |
| Production | Borden Mace | Associate Producer |
| Camera | Edward Horton | Camera Operator |
| Crew | Laurence Heath | Additional Writing |
| Crew | Emmett Murphy | Additional Writing |
| Crew | Virginia Shaler | Additional Writing |
