Slip and Sach take the rap for a robbery they did not commit in order to uncover the real robbers, whom they suspect are led by a convict who gives orders to his gang outside via a short-wave radio stashed somewhere in the prison.
Leo Gorcey
as Slip Mahoney
Huntz Hall
as Horace Debussy 'Sach' Jones
G. Pat Collins
as Bat Armstrong
Effie Laird
as Ma Armstrong
Bernard Gorcey
as Louie Dumbrowsky
William Benedict
as Whitey, Bowery Boy
David Gorcey
as Bowery Boy #4, dark-haired
Buddy Gorman
as Bowery Boy #5, slender
Joseph Crehan
as Warden Burnside
Richard Benedict
as Skeets O'Neil
Frank Marlowe
as Ma's Clean-shaven Henchman
Eddie Foster
as Ma's Henchman with Mustache
