"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
John Grant
Screenplay
Hugh Wedlock Jr.
Story
Howard Snyder
Robert Lees
Richard H. Riedel
Art Direction
John P. Austin
Set Decoration
Virgil W. Vogel
Editor
Bernard Herzbrun
Bud Westmore
Makeup Artist
Robert Pritchard
Sound
Russell A. Gausman
George Robinson
Director of Photography
Joan St. Oegger
Hairstylist
Frederic I. Rinaldo
Leslie I. Carey
David S. Horsley
Visual Effects
Howard Christie
Producer
William Lava
Music
Walter Scharf
H. G. Wells
Johnny Green
Ronald R. Rondell
Assistant Director
Daniele Amfitheatrof
Miklós Rózsa
Milton Rosen
Ed Keyes
Property Master
Frank Skinner
Eric Zeisl
Hans J. Salter
Ethmer Roten
Musician
Joseph Gershenson
Original Music Composer
Roswell A. Hoffmann
Music Director
