- Milburn Stone
- Tom Brant
- Jan Wiley
- Janet Lowe
- Dennis Moore
- Jack Ryan
- Addison Richards
- Garret Donahue
- Byron Foulger
- Prof. Henderson
- Maris Wrixon
- Dorothy Newton
- Sarah Padden
- Aggie
- George Lynn
- Herman
- Russell Hicks
- Chief O'Brien
- Roland Varno
- Hoff
- Lash LaRue
- Migsy
- Jerry Shane
- Dan
- Neyle Morrow
- Spike
- John Eldredge
- Walter Stark
- Ernie Adams
- Flash Faust
- Richard Alexander
- Flamingo Club Bouncer
- Robert Barron
- M-5
- Harris Berger
- Boys' Club Member
- Charles Blake
- Charter Plane Steward
- Walter Bonn
- Heifel
- George M. Carleton
- Jake Brown
- Horace B. Carpenter
- Man on Street
- George Chesebro
- Fireman Dragging Hose
- Jack Rube Clifford
- Riverton Tower Switchman
- Edmund Cobb
- Riverton Railroad Official in Tower
- Kernan Cripps
- Apartment Thug
- Dick Curtis
- Reicher
- Sayre Dearing
- 2nd Nazi Lab Guard
- Joe Devlin
- Bauer
- Edward Earle
- Phillips - Editor
- Matty Fain
- Slag Ritter
- Al Ferguson
- Truck Driver
- William Frambes
- Pat
- Dick French
- Schmidt
- John Gannon
- Charter Pilot
- Buddy Gorman
- Lug
- William Haade
- Abandoned Warehouse Thug
- Chuck Hamilton
- Guard in Hospital
- Richard Hirbe
- Johnny
- Margaret Hoffman
- Bay Street Landlady
- Edward Howard
- Pete Clark
- Kenneth Howell
- Boys' Club Member
- Arthur Loft
- M-1's Voice-Man
- Pierce Lyden
- Luther
- Carl Mathews
- Henchman
- Charles McAvoy
- Policeman
- John Merton
- Vogel
- George Offerman Jr.
- Boys' Club Extra
- Jack Perrin
- Policeman
- Jack Rockwell
- Safecracker
- Gene Roth
- Bat Logan
- David Sharpe
- Policeman
- Charles Sherlock
- Fingerprint Clerk
- Tom Steele
- Policeman / Henchman (uncredited)
- Robert R. Stephenson
- Bosch
- Ben Taggart
- Apartment Thug
- Joe Tarrell
- Okey
- Forrest Taylor
- Hospital Doctor
- Brooke Temple
- Mr. Butler
- Ken Terrell
- Henchman
- Dale Van Sickel
- Policeman in Loft Building
- Bud Wolfe
- Abandoned Loft Thug
- William Yetter Jr.
- Bill
- Clifton Young
- Loft Building Henchman
