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)

Charles Lamont

Director

John Grant

Screenplay

Hugh Wedlock Jr.

Story

Howard Snyder

Story

Robert Lees

Screenplay

Richard H. Riedel

Art Direction

John P. Austin

Set Decoration

Virgil W. Vogel

Editor

Bernard Herzbrun

Art Direction

Bud Westmore

Makeup Artist

Robert Pritchard

Sound

Russell A. Gausman

Set Decoration

George Robinson

Director of Photography

Joan St. Oegger

Hairstylist

Frederic I. Rinaldo

Screenplay

Leslie I. Carey

Sound

David S. Horsley

Visual Effects

Howard Christie

Producer

William Lava

Music

Walter Scharf

Music

H.G. Wells

Story

Johnny Green

Music

Ronald R. Rondell

Assistant Director

Daniele Amfitheatrof

Music

Miklós Rózsa

Music

Milton Rosen

Music

Ed Keyes

Property Master

Frank Skinner

Music

Eric Zeisl

Music

Hans J. Salter

Music

Ethmer Roten

Musician

Joseph Gershenson

Original Music Composer

Roswell A. Hoffmann

Visual Effects

Joseph Gershenson

Music Director