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