A young soldier uncovers a ring of spies when he investigates his brother's mysterious murder.
| Actor | Role |
|---|---|
 Eric LindenGreg Carroll | Greg Carroll |
 Ben AlexanderSgt. Paul | Sgt. Paul |
 Donald CurtisLt. John Harmon | Lt. John Harmon |
 Ann DoranLinda | Linda |
 Constance WorthAlma Barton | Alma Barton |
 Weldon HeyburnSgt. Blake | Sgt. Blake |
 Earle HodginsWallace | Wallace |
 I. Stanford JolleyCarl Flegler | Carl Flegler |
 Emmett VoganHarold | Harold |
| BBill CartledgeElevator Operator | Elevator Operator |
 Jack CheathamAgent Martin | Agent Martin |
 Dudley DickersonSam Dillingham | Sam Dillingham |
| RRay ErlenbornPvt. Norton | Pvt. Norton |
 Robert FrazerCapt. Bryant | Capt. Bryant |
 Boyd IrwinCol. Longstreet | Col. Longstreet |
 George LynnProf. Carroll | Prof. Carroll |
 Dennis MooreStanley Hume - 5th Columnist | Stanley Hume - 5th Columnist |
| BBernice PilotMamie | Mamie |
| WWilliam RuhlCapt. Gray | Capt. Gray |