Leo Gorcey
— Slip Mahoney
Huntz Hall
— Sach
Gabriel Dell
— Gabe Moreno
Alan Napier
— Dr. Druzik
Jane Adams
— Nancy Marlowe
William Benedict
— Whitey
Bernard Gorcey
— Louie
Glenn Strange
— Atlas the Monster
Benny Bartlett
— Butch
David Gorcey
— Chuck
Skelton Knaggs
— Hugo
William Yetter Sr.
— Otto
Minerva Urecal
— Mrs. Hoskins
Chester Clute
— Mike Barton
Pat Goldin
— Father
Robert Coogan
— Young Man