Peter Lorre
— Colonel Gimpy
Brian Donlevy
— Ace Martin
Helen Wood
— Ruth Franklin
Ralph Morgan
— John R. Flemyng
Thomas Beck
— Joe Randall
Kay Linaker
— Mrs. Fleming
Lester Matthews
— Sidney Grant
Earle Foxe
— Operative #30
J. Carrol Naish
— Operative #77
Gloria Roy
— Operative #16
Oscar Apfel
— Alfred Knuxton
Paul Stanton
— Daniel D. Harrington
Howard Hickman
— Major White
Lynn Bari
— Office Worker (uncredited)
Madge Bellamy
— Secretary (uncredited)
William Benedict
— Bunky, Office Boy (uncredited)