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