This is a feature-length compilation of three short episodes taken from a TV series called 'Colonel March of Scotland Yard' (1954-56, 26 episodes) starring Boris Karloff as Colonel March, head of Scotland Yard's Department D.3, otherwise known as The Bureau of Queer Complaints.
| Actor | Role |
|---|---|
 Boris KarloffColonel March | Colonel March |
 Ewan RobertsInspector Ames | Inspector Ames |
 Joan SimsMarjorie Dawson | Marjorie Dawson |
 Richard WattisCabot | Cabot |
 Sheila BurrellJoan Forsythe | Joan Forsythe |
 Anthony ForwoodJim Hartley | Jim Hartley |
 Ronald Leigh-HuntIreton Bowlder | Ireton Bowlder |
 Patricia OwensBetty Hartley | Betty Hartley |
 John HewerJohn Parrish | John Parrish |
 Roger MaxwellMaj. Rodman | Maj. Rodman |
| BBernard RebelThe Count | The Count |
 Dana WynterFrancine Rapport | Francine Rapport |
 Marianne StoneCustomer in Bank (uncredited) | Customer in Bank (uncredited) |
 Peter ButterworthBank Clerk (uncredited) | Bank Clerk (uncredited) |
| SSonya HanaPaula | Paula |
| NNita ValerieLibrarian | Librarian |
 Cy EndfieldMan leaving British Museum library (uncredited) | Man leaving British Museum library (uncredited) |
| PPat HaganPolice Constable at Bank (uncredited) | Police Constable at Bank (uncredited) |
| VVictor HarringtonCustomer in Bank (uncredited) | Customer in Bank (uncredited) |
| CCharles SaynorPolice Constable (uncredited) | Police Constable (uncredited) |