John Loder
— Reginald Parker / Edward Grey
June Duprez
— April Manby Carson
Michael St. Angel
— Lieutenant Bob Carson
Miles Mander
— Chief Inspector W.R. Allison
Rose Hobart
— Dorothy Kent
Gilbert Emery
— Dr. Manby
Rex Evans
— Leslie Shelton
Matthew Boulton
— Inspector Graham
Olaf Hytten
— Banks
Lydia Bilbrook
— Mrs. Manby
Ian Wolfe
— Lord Mayor Herman Brandon R. Clive
Milton Owen
— Inspector (Uncredited)
Norman Ainsley
— First Passenger (Uncredited)
George Atkinson
— Bellboy (Uncredited)
Frank Baker
— Inspector (Uncredited)
Frank Benson
— Bellboy (Uncredited)
Lillian Bronson
— Hotel Maid (Uncredited)
George Broughton
— Bellboy (Uncredited)
Tom Burton
— Policeman (Uncredited)
Wheaton Chambers
— Clerk (Uncredited)
Robin Sanders Clark
— English Pilot (Uncredited)
Harry Clay
— Pilot (Uncredited)
Robert Cory
— Chauffeur (Uncredited)
Alec Craig
— Vacuuming Bellboy (Uncredited)
Victor Cutler
— Pilot (Uncredited)
Herbert Evans
— Manby's Butler (Uncredited)
Ellen George Ferguson
— Mrs. Shackleton (Uncredited)
Sherry Hall
— Hotel Desk Clerk (Uncredited)
Alec Harford
— Ticket Clerk (Uncredited)
Joy Harington
— London Waitress (Uncredited)