"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)
Donn Mullahy
Story
Wallace Fox
Director
Robert Golden
Editor
Sam Katzman
Producer
Fred Preble
Set Decoration
Carl Foreman
Writer
Ed W. Rote
Production Manager
Brendan Wood
Sam Robins
Screenplay
Pete Mayer
Marcel Le Picard
Director of Photography
Johnny Lange
Music Director
Lew Porter
Original Music Composer
Harry M. Slott
Assistant Director
Arthur Hammond
Glen Glenn
Sound