"The East Side Kids discover that one of their own, Danny, is torn between staying in school and becoming a boxer, and is getting mixed up with gangsters."
Leo Gorcey
as Muggs McGinnis
Bobby Jordan
as Danny Breslin
Huntz Hall
as Limpy
Warren Hull
as Officer Tom Brady
Charlotte Henry
as Mary Breslin
Keye Luke
as Clancy
Bobby Stone
as Monk Martin
Donald Haines
as Skinny, red-haired kid
Sunshine Sammy Morrison
as Scruno
David Gorcey
as PeeWee
Martha Wentworth
as Mrs. Brady
Jack Mulhall
as Cop at Prizefight with the Lieutenant
Eddie Foster
as Slats Morrison
Dennis Moore
as Dorgan
Tony Carson
as Henchman Dutch
Pat Costello
as Muggs' Trainer
Dick Ryan
as Police Lieutenant
Bill Cartledge
as Johnny Ryan, Muggs' opponent (uncredited)
Minerva Urecal
as Head of Reform School (uncredited)
Jack Chefe
as Henchman Nick (uncredited)
Jack Carr
as Milkman George (uncredited)
Wallace Fox
Director
Brendan Wood
Story
Donn Mullahy
Sam Robins
Screenplay
Carl Foreman
Writer
Sam Katzman
Producer
Pete Mayer
Robert Golden
Editor
Fred Preble
Set Decoration
Ed W. Rote
Production Manager
Marcel Le Picard
Director of Photography
Lew Porter
Music Director
Johnny Lange
Arthur Hammond
Assistant Director
Harry M. Slott
Glen Glenn
Sound
Original Music Composer