Spotted after he microfilms secret U.S. Navy documents, foreign agent Rattick is killed when he tries to make a getaway. Naval Intelligence officer Captain Wright and Operative Dale are assigned to investigate and determine who is behind the spy syndicate for which Rattick worked. They bring in the services of Agent Tom Norman, who bears a strong resemblance to Rattick.
| Actor | Role |
|---|---|
 Richard TravisTom Norman / Rattick | Tom Norman / Rattick |
 Helen WestcottMary Lynn | Mary Lynn |
 Emory ParnellCapt. Jan Roburt | Capt. Jan Roburt |
 Richard FraserOperative Farrell | Operative Farrell |
 James GriffithOperative Dale | Operative Dale |
 Ralf HaroldeSteele | Steele |
 Selmer JacksonCapt. Wright | Capt. Wright |
 Gene RothEhrlich | Ehrlich |
 William TannenDajek | Dajek |
 Otto ReichowBalser | Balser |
 Pierre WatkinMr. Sigmund | Mr. Sigmund |
 Paul BryarCmdr. Braddock | Cmdr. Braddock |
 William HaadeAnorus | Anorus |
 Jason Robards Sr.Dr. Loring | Dr. Loring |