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

Danton Ferrero

Mr. DeSoto

George Anderson

Detective Bennett

Duke York

Joe Carpa

Eddie Laughton

Henchman Bishop

George Magrill

Henchman Scarlatti

James Moore