| Gene Barry | |
| Lydia Clarke | |
| Michael Moore | |
| Nancy Gates | |
| Lee Aaker | |
| Milburn Stone | |
| Bert Freed | |
| Frank Cady | |
| Houseley Stevenson | |
| Leonard Strong | |
| Harry Hausner | |
| John Damler | |
| George Lynn | |
| Olan Soule | |
| Anthony Warde |
Spies hold the son of a nuclear physicist hostage in exchange for the Los Alamos bomb formula.
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