The Lone Wolf tracks down Nazi spies in London during the German bombing.
| Actor | Role |
|---|---|
 Warren WilliamMichael Lanyard | Michael Lanyard |
 Eric BloreJameson | Jameson |
 Hillary BrookePamela Hart | Pamela Hart |
 Thurston HallInsp. Crane | Insp. Crane |
 Fred KelseyDickens | Dickens |
 Forrest TuckerAnton Schugg | Anton Schugg |
 Matthew BoultonInspector Stephens | Inspector Stephens |
 Kurt KatchGustav Sossel | Gustav Sossel |
 Morton LowryKent Wells | Kent Wells |
| LLeslie DenisonHarvey Leeds | Harvey Leeds |
 Billy BevanGeorge Barrow | George Barrow |
 Stanley LoganSir Stafford Hart | Sir Stafford Hart |
| TTom StevensonPolice Constable Hopkins | Police Constable Hopkins |
 Lloyd BridgesWaiter/Spy (uncredited) | Waiter/Spy (uncredited) |
| HHeather WildeNot listed | Not listed |