Bruce Bennett
— Patrick Norris
Florence Rice
— Lola Hobbs
Barton MacLane
— Sam O'Donnell
Joe Downing
— Lou Boyd
Joseph Crehan
— Police Chief Hobbs
Howard Hickman
— Dr. Talbot
Edward Van Sloan
— Prof. Holtz
P.J. Kelly
— Prof. Cordet
Don Beddoe
— Maj. Blaine
William Forrest
— Mr. Brooks
Dantón Ferrero
— Mr. DeSoto
George Anderson
— Detective Bennett
Duke York
— Joe Carpa
Eddie Laughton
— Henchman Bishop
George Magrill
— Henchman Scarlatti
Cy Schindell
— Henchman Felton
Sam Ash
— Walter A. Adams, gang accountant
John Dilson
— Walter W. Carter
George McKay
— Bill "Goldy" Golden
Jessie Perry
— Mom Norris