Colonel March of Scotland Yard

• 
  Boris Karloff
  Colonel March Of Scotland Yard
• 
  Ewan Roberts
  Inspector Ames
• 
  Eric Pohlmann
  Goron
• 
  Doris Nolan
  Linda
• 
  Phil Brown
  Dr. Bryan Hayes
• 
  Anton Diffring
  Davos
• 
  Marne Maitland
  Thoreau
• 
  Alan Wheatley
  O'Brien
• 
  Karel Stepanek
  Hodek
• 
  Christopher Lee
  Jeanpierre
• 
  Hugh Williams
  Harold Hartley
• 
  Jane Griffiths
  Nancy
• 
  Hubert Gregg
  Pennacott
• 
  Mary Parker
  Emily
• 
  Betty Paul
  Mrs. Sargent
• 
  Stuart Lindsell
  Sir Henry Danier
• 
  Virginia Downing
  Madame Richter
• 
  Zena Marshall
  Madeleine
• 
  Elspet Gray
  Johanna
• 
  Robert Brown
  Hastings
• 
  Sheila Burrell
  Joan Forsythe
• 
  Glyn Houston
  Peter Ridgway
• 
  Philip Friend
  Hamilton
• 
  Anthony Forwood
  Jim Hartley
• 
  Sandra Dorne
  Rosie
• 
  Percy Marmont
  Sir George Watkins
• 
  Ronald Leigh-Hunt
  Ireton Boulder
• 
  Patrick Barr
  Horton
• 
  Peter Illing
  Lavois
• 
  Fanny Rowe
  Madame Jeanpierre
• 
  Hugh Griffith
  Dr. Ivy
• 
  Helen Cherry
  Evelyn Innes
• 
  Rachel Gurney
  Martha
• 
  John Arnatt
  Wesley
• 
  Robert Ayres
  Wyatt
• 
  Michael Shepley
  Sir Nigel
• 
  Gerard Heinz
  Dr. James Patten
• 
  Genine Graham
  Victoria
• 
  Ivan Craig
  Osborne
• 
  Henryetta Edwards
  Alice

• Bernard Knowles
• Arthur Crabtree
• Phil Brown
• Donald Ginsberg
• Paul Dickson
• Terence Fisher
• Cy Endfield

• John Dickson Carr
  ...
  (based on: "The Department of Queer Complaints" by
• Leo Davis
  ...
  (screenplay)
• Peter Green
  ...
  (script)
• Paul Monash
  ...
  (script)
• Waldo Salt
  ...
  (script)
• Leslie Slote
  ...
  (script)
• Paul Tabori
  ...
  (script)