Captain Frank Marvin and Lieut. Bob Chase are army draftsmen in the Ordnance Department. Marvin is working on plans for a submarine that is expected to revolutionize warfare. One of the foreign governments is anxious to obtain the plans.
| Actor | Role |
|---|---|
 Gayne WhitmanCapt. Frank Marvin | Capt. Frank Marvin |
 Vivian RichZena, Valpar’s Niece | Zena, Valpar’s Niece |
 Estelle AllenRuth Chase | Ruth Chase |
 Frank BorzageLt. Bob Chase | Lt. Bob Chase |
 George PeriolatMolne Valpar | Molne Valpar |
| WWard McAllisterMonte | Monte |