Two federal agents do not believe an atomic-bomb threat is just another war game.
| Actor | Role |
|---|---|
 John IrelandInvestigator John Williams | Investigator John Williams |
 Richard DenningChief Investigator Paul Reagan | Chief Investigator Paul Reagan |
 Suzanne DalbertMargo Wayne | Margo Wayne |
 Robert FoulkCommander Jackson | Commander Jackson |
 Mike ConnorsLt. Magrew (as Touch Conners) | Lt. Magrew (as Touch Conners) |
 Richard AvondeBuzz Olin | Buzz Olin |
 William BryantFBI Agent in Montage (as William R. Klein) | FBI Agent in Montage (as William R. Klein) |
| CCicely BrowneBlonde Woman | Blonde Woman |
 Tommy FarrellAgent Reynolds | Agent Reynolds |
 Joseph MellBox of Taffy Man at Penn Station | Box of Taffy Man at Penn Station |
| RRobert HunterAndy, alias Andre, an agent | Andy, alias Andre, an agent |
 Peter MarshallLeo Wayne | Leo Wayne |