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