Bud Alexander

Bud Abbott

Lou Francis

Lou Costello

Helen Gray

Nancy Guild

Tommy Nelson

Arthur Franz

Boots Marsden

Adele Jergens

Boots Morgan

Sheldon Leonard

Det. Roberts

William Frawley

Dr. Philip Gray

Gavin Muir

Radio Announcer

Sam Balter

Waiter

Syd Saylor

Rocky Hanlon

John Daheim

Rooney

Billy Wayne

Sneaky (uncredited)

Bobby Barber

Officer (uncredited)

Howard Banks

Milt

Edward Gargan

Bald Man (uncredited)

Richard Bartell

Fight Spectator (uncredited)

Phil Bloom

Dr. Turner

Paul Maxey

Stillwell

Herb Vigran

Trainer (uncredited)

John Breen

Referee

Frankie Van

Ring Announcer (uncredited)

Milt Bronson

Lou's Handler

Carl Sklover

Reporter (uncredited)

Steve Carruthers

Torpedo

George J. Lewis

Motorcycle Cop

Ralph Dunn

Dugan Detective School Graduate (uncredited)

Tom Coleman

Counter Man (uncredited)

Chester Conklin

Bartender

Harold Goodwin

Trainer (uncredited)

Bing Conley

Cop

Perc Launders

Nurse

Edith Sheets

Newspaperman (uncredited)

Russ Conway

Fight Spectator (uncredited)

Paul Cristo

Col. Duffie (uncredited)

Frank Dae

Man (uncredited)

Roy Darmour

Rocky's Handler

Charles Perry

Reporter (uncredited)

Sayre Dearing

Hospital Visitor (uncredited)

Jack Deery

Man in Gym (uncredited)

Jimmy Dime

Fight Spectator (uncredited)

Donald Kerr

Reporter (uncredited)

George Ford

Man (uncredited)

Dick Gordon

Fighter on Rowing Machine (uncredited)

Kit Guard

Graduation Spectator (uncredited)

Bobby Hale

Policeman (uncredited)

Chuck Hamilton

Fight Spectator (uncredited)

Stuart Holmes

Policeman (uncredited)

Kenner G. Kemp

Trainer (uncredited)

Johnny Kern

Tough Guy in Bar (uncredited)

Rory Mallinson

Graduation Spectator (uncredited)

Mathew McCue

Restaurant Patron (uncredited)

Hans Moebus

Photographer (uncredited)

Ralph Montgomery

Training Spectator (uncredited)

Mike Morelli

Fight Spectator (uncredited)

William H. O'Brien

Fight Spectator (uncredited)

Monty O'Grady

Photographer (uncredited)

Franklin Parker

Dugan Detective School Graduate (uncredited)

Jack Perrin

Rocky's Handler (uncredited)

Jack Perry

Waiter (uncredited)

Victor Romito

Fight Spectator (uncredited)

Clark Ross

Fighter (uncredited)

Sammy Shack

Attendant (uncredited)

Jack Shutta

Newspaperman (uncredited)

Billy Snyder

Dugan Detective School Graduate (uncredited)

Brick Sullivan