Bud Alexander
Lou Francis
Helen Gray
Tommy Nelson
Boots Marsden
Boots Morgan

Det. Roberts

Dr. Philip Gray
Radio Announcer

Rocky Hanlon
Professor Dugan (uncredited)

Sneaky (uncredited)
Officer (uncredited)
Bald Man (uncredited)
Fight Spectator (uncredited)
Trainer (uncredited)
Ring Announcer (uncredited)
Man at Bar (uncredited)

Reporter (uncredited)
Dugan Detective School Graduate (uncredited)

Counter Man (uncredited)
Trainer (uncredited)

Newspaperman (uncredited)
Fight Spectator (uncredited)

Col. Duffie (uncredited)
Man (uncredited)

Reporter (uncredited)
Hospital Visitor (uncredited)

Man in Gym (uncredited)

Motorcycle Cop (uncredited)
Reporter (uncredited)

Milt (uncredited)

Bartender (uncredited)
Man (uncredited)

Fighter on Rowing Machine (uncredited)
Graduation Spectator (uncredited)
Policeman (uncredited)

Fight Spectator (uncredited)

Policeman (uncredited)
Trainer (uncredited)

Fight Spectator (uncredited)
Cop (uncredited)

Torpedo Al (uncredited)

Tough Guy in Bar (uncredited)

Dr. Turner (uncredited)
Graduation Spectator (uncredited)
Restaurant Patron (uncredited)
Photographer (uncredited)
Training Spectator (uncredited)

Fight Spectator (uncredited)

Fight Spectator (uncredited)
Photographer (uncredited)

Dugan Detective School Graduate (uncredited)

Rocky's Handler (uncredited)
Waiter (uncredited)
Fight Spectator (uncredited)

Waiter (uncredited)
Fighter (uncredited)
Nurse (uncredited)
Attendant (uncredited)

Lou's Handler (uncredited)
Newspaperman (uncredited)
Dugan Detective School Graduate (uncredited)
Referee (uncredited)

Stillwell (uncredited)

Rooney - Rocky's Manager (uncredited)
Director
Editor
Makeup Artist
Sound
Screenplay
Art Direction
Set Decoration
Director of Photography
Art Direction
Screenplay
Hairstylist
Screenplay
Story
Producer
Story
Sound
Set Decoration
Visual Effects

Music
Property Master

Music

Assistant Director

Music
Musician

Music
Music
Music

Story

Music
Music
Music
Original Music Composer
Visual Effects
Music Director