character - Sir Harold Plant

character - Dr. Green

character - Professor Fuller

character - Leeds

character - Landlord

character - Colonel Thompson

character - Headmaster

character - Narrator

character - Flag Captain

character - Brother Elias

character - 2nd Plain Clothes Officer

character - Superintendent

character - Thompson

character - Air Vice Marshal (uncredited)

character - Squire Myles

character - Potter

character - Capt. Stanley Lord

character - Parker

character - Banker Green

character - Inspector Duggan

character - Admiral Habberfield

character - Detective Sgt. Bolton

character - Inspector Hobson

character - Scotland Yard Supt. Davidson

character - Jack Burns

character - Sir Henry Dimmock

character - Raymond Curtis

character - Inspector Simmons

character - Supt. John Harrington

character - Insp. Durham

character - Insp. Treherne

character - Wg. Cmr. Rogers

character - Inspector Harmer

character - Detective at Ann's Apartment (Uncredited)

character - Col. Stafford

character - Inspector Markham

character - Inspector Duggan

character - Det. Cutler

character - Stevens

character - Supt. Walshaw

character - Narrator