Peter Lorre as Colonel Gimpy

Brian Donlevy as Ace Martin

Helen Wood as Ruth Franklin

Ralph Morgan as John R. Flemyng

Thomas Beck as Joe Randall

Kay Linaker as Mrs. Fleming

Lester Matthews as Sidney Grant

Earle Foxe as Operative #30

J. Carrol Naish as Operative #77

Gloria Roy as Operative #16

Oscar Apfel as Alfred Knuxton

Paul Stanton as Daniel D. Harrington

Howard Hickman as Major White

Lynn Bari as Office Worker (uncredited)

Madge Bellamy as Secretary (uncredited)

William Benedict as Bunky, Office Boy (uncredited)