Haynes
Dr. Lloyd
Palmer (uncredited)
Inspector
Colonel Charles Mercer
Henry Ryland
Lord Valchrist
Doctor W.H. Glanville, C.B., C.B.E.
Arnold Winslow
Dr. Crabtree
Major Fergusson
Inspector Maxwell
Mannering
Adjutant
Inspector Davis
Prince
Bart Massey
Mountie
Gardner
Hallett
Jehan Le Loup
Captain Robert Rogers
Donaldson (uncredited)
Chester Greene
Dr. Brooks
Roger's Friend (Uncredited)
Tom Brock
Doctor Vernon
Miller
Studio Manager
Sir Philip Burleigh
Lieutenant Prescott
Paul Hassel as a young lieutenant
William Dobbin
Dr. John Lucas
