Bud Abbott
Bud Alexander
Lou Costello
Lou Francis
Nancy Guild
Helen Gray
Arthur Franz
Tommy Nelson
Adele Jergens
Boots Marsden
Sheldon Leonard
Boots Morgan
William Frawley
Det. Roberts
Gavin Muir
Dr. Philip Gray
Sam Balter
Radio Announcer
John Daheim
Rocky Hanlon
Walter F. Appler
Professor Dugan (uncredited)
Bobby Barber
Sneaky (uncredited)
Howard Banks
Officer (uncredited)
Richard Bartell
Bald Man (uncredited)
Phil Bloom
Fight Spectator (uncredited)
John Breen
Trainer (uncredited)
Milt Bronson
Ring Announcer (uncredited)
Ralph Brooks
Man at Bar (uncredited)
Steve Carruthers
Reporter (uncredited)
Tom Coleman
Dugan Detective School Graduate (uncredited)
Chester Conklin
Counter Man (uncredited)
Bing Conley
Trainer (uncredited)
Russ Conway
Newspaperman (uncredited)
Paul Cristo
Fight Spectator (uncredited)
Frank Dae
Col. Duffie (uncredited)
Roy Darmour
Man (uncredited)
Sayre Dearing
Reporter (uncredited)
Jack Deery
Hospital Visitor (uncredited)
James Dime
Man in Gym (uncredited)
Ralph Dunn
Motorcycle Cop (uncredited)
George Ford
Reporter (uncredited)
Edward Gargan
Milt (uncredited)
Harold Goodwin
Bartender (uncredited)
Dick Gordon
Man (uncredited)
Kit Guard
Fighter on Rowing Machine (uncredited)
Bobby Hale
Graduation Spectator (uncredited)
Chuck Hamilton
Policeman (uncredited)
Stuart Holmes
Fight Spectator (uncredited)
Kenner G. Kemp
Policeman (uncredited)
Johnny Kern
Trainer (uncredited)
Donald Kerr
Fight Spectator (uncredited)
Perc Launders
Cop (uncredited)
George J. Lewis
Torpedo Al (uncredited)
Rory Mallinson
Tough Guy in Bar (uncredited)
Paul Maxey
Dr. Turner (uncredited)
Mathew McCue
Graduation Spectator (uncredited)
Hans Moebus
Restaurant Patron (uncredited)
Ralph Montgomery
Photographer (uncredited)
Mike Morelli
Training Spectator (uncredited)
William H. O'Brien
Fight Spectator (uncredited)
Monty O'Grady
Fight Spectator (uncredited)
Franklin Parker
Photographer (uncredited)
Jack Perrin
Dugan Detective School Graduate (uncredited)
Jack Perry
Rocky's Handler (uncredited)
Victor Romito
Waiter (uncredited)
Clark Ross
Fight Spectator (uncredited)
Syd Saylor
Waiter (uncredited)
Sammy Shack
Fighter (uncredited)
Edith Sheet
Nurse (uncredited)
Jack Shutta
Attendant (uncredited)
Carl Sklover
Lou's Handler (uncredited)
Billy Snyder
Newspaperman (uncredited)
Brick Sullivan
Dugan Detective School Graduate (uncredited)
Frankie Van
Referee (uncredited)
Herb Vigran
Stillwell (uncredited)
Billy Wayne
Rooney - Rocky's Manager (uncredited)