When his colleague is killed during a chase in Kentish Town, London bobby Frank volunteers to become a dog-handler.
| Actor | Role |
|---|---|
 Joan RicePat Lewis | Pat Lewis |
 Tim TurnerFrank Mason | Frank Mason |
 Sandra DorneBlonde | Blonde |
 Charles VictorSergeant | Sergeant |
| CCecil BrockCriminal | Criminal |
 John Le MesurierInspector | Inspector |
 Christopher LeeJohnny, a constable | Johnny, a constable |
 Nora GordonMrs. Lewis | Mrs. Lewis |
| RRex IIIPolice Dog | Police Dog |
| JJames GilbertKen Lade | Ken Lade |
| GGarard GreenPolice Seargant at Break-in | Police Seargant at Break-in |
 Norman MitchellVet | Vet |
| GGay CameronNot listed | Not listed |
| PPhyllis MorrisNot listed | Not listed |
| JJohn WarrenClerk of Works | Clerk of Works |
 Ian FlemingGentleman Walking His Dog (uncredited) | Gentleman Walking His Dog (uncredited) |
| AArthur HowellPolice Dispatcher (uncredited) | Police Dispatcher (uncredited) |
| CColin McKenziePolice Dispatcher (uncredited) | Police Dispatcher (uncredited) |
| JJim MorrisPolice Dispatcher (uncredited) | Police Dispatcher (uncredited) |
| FFred NicholasPolice Dispatcher (uncredited) | Police Dispatcher (uncredited) |