Enemy agents are everywhere and they are sabotaging all important war deliveries. The body of a hobo found in a train wreck had a money belt with $50,000 and a tattoo of a circle and arrow. This is a tattoo for saboteurs for hire and Brass must impersonate the dead man to find out what his orders are. As Steve Coe, he meets with the band of enemy agents in California and everything goes well until the wife of the dead 'Hobo' shows up. Luckily, Gabby is able to save Brass and Brass learns what is his assignment. He is to board the USN airship 'Mason', which is testing the super secret Inertia Projector, and destroy the airship.
| Actor | Role |
|---|---|
 Ronald ReaganBrass Bancroft | Brass Bancroft |
 Eddie Foy Jr.Gabby Watters | Gabby Watters |
 John LitelSaxby | Saxby |
 Lya LysHilda Riker | Hilda Riker |
 Frank WilcoxJerry | Jerry |
 James StephensonJoe Garvey | Joe Garvey |
| JJulie StevensNaval Hospital Nurse | Naval Hospital Nurse |
 Helen LyndDolly | Dolly |
 Robert WarwickDr. Finchley | Dr. Finchley |
| VVictor ZimmermanR.G. Rumford | R.G. Rumford |
 Charles BrokawOtto Brennerman | Otto Brennerman |
 John HamiltonHargrave | Hargrave |
 Selmer JacksonDr. Riddell | Dr. Riddell |
 William GouldAdmiral Winfield | Admiral Winfield |
 Kenneth HarlanCommander Wayne | Commander Wayne |
| OOwen KingGeorge Hayden | George Hayden |
 Dick RichJohn Kramer | John Kramer |