Bud Alexander
Bud Abbott
Lou Francis
Lou Costello
Professor Dugan (uncredited)
Walter F. Appler
Sneaky (uncredited)
Bobby Barber
Officer (uncredited)
Howard Banks
Bald Man (uncredited)
Richard Bartell
Fight Spectator (uncredited)
Phil Bloom
Trainer (uncredited)
John Breen
Ring Announcer (uncredited)
Milt Bronson
Man at Bar (uncredited)
Ralph Brooks
Reporter (uncredited)
Steve Carruthers
Dugan Detective School Graduate (uncredited)
Tom Coleman
Helen Gray
Nancy Guild
Counter Man (uncredited)
Chester Conklin
Bing Conley
Newspaperman (uncredited)
Russ Conway
Paul Cristo
Col. Duffie (uncredited)
Frank Dae
Man (uncredited)
Roy Darmour
Sayre Dearing
Hospital Visitor (uncredited)
Jack Deery
Man in Gym (uncredited)
James Dime
Motorcycle Cop (uncredited)
Ralph Dunn
Tommy Nelson
Arthur Franz
George Ford
Milt (uncredited)
Edward Gargan
Bartender (uncredited)
Harold Goodwin
Dick Gordon
Fighter on Rowing Machine (uncredited)
Kit Guard
Graduation Spectator (uncredited)
Bobby Hale
Policeman (uncredited)
Chuck Hamilton
Stuart Holmes
Kenner G. Kemp
Johnny Kern
Boots Marsden
Adele Jergens
Donald Kerr
Cop (uncredited)
Perc Launders
Torpedo Al (uncredited)
George J. Lewis
Tough Guy in Bar (uncredited)
Rory Mallinson
Dr. Turner (uncredited)
Paul Maxey
Mathew McCue
Restaurant Patron (uncredited)
Hans Moebus
Photographer (uncredited)
Ralph Montgomery
Training Spectator (uncredited)
Mike Morelli
William H. O'Brien
Boots Morgan
Sheldon Leonard
Monty O'Grady
Franklin Parker
Jack Perrin
Rocky's Handler (uncredited)
Jack Perry
Waiter (uncredited)
Victor Romito
Clark Ross
Syd Saylor
Fighter (uncredited)
Sammy Shack
Nurse (uncredited)
Edith Sheet
Attendant (uncredited)
Jack Shutta
Det. Roberts
William Frawley
Lou's Handler (uncredited)
Carl Sklover
Billy Snyder
Brick Sullivan
Referee (uncredited)
Frankie Van
Stillwell (uncredited)
Herb Vigran
Rooney - Rocky's Manager (uncredited)
Billy Wayne
Dr. Philip Gray
Gavin Muir
Radio Announcer
Sam Balter
Rocky Hanlon
John Daheim
Music
Miklós Rózsa
Frank Skinner
Johnny Green
Walter Scharf
Makeup Artist
Bud Westmore
William Lava
Director
Charles Lamont
Editor
Virgil W. Vogel
Story
H.G. Wells
Screenplay
John Grant
Hugh Wedlock Jr.
Howard Snyder
Robert Lees
Art Direction
Richard H. Riedel
Set Decoration
John P. Austin
Bernard Herzbrun
Sound
Robert Pritchard
Russell A. Gausman
Director of Photography
George Robinson
Hairstylist
Joan St. Oegger
Frederic I. Rinaldo
Leslie I. Carey
Visual Effects
David S. Horsley
Producer
Howard Christie
Assistant Director
Ronald R. Rondell
Daniele Amfitheatrof
Milton Rosen
Property Master
Ed Keyes
Eric Zeisl
Hans J. Salter
Musician
Ethmer Roten
Original Music Composer
Joseph Gershenson
Roswell A. Hoffmann
Music Director