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