Cuthbert Greenway / Dr. Ralph Greenway
Bud Abbott
Horatio Prim
Lou Costello
Sgt. Conners
William Hall
Maj. Putnam
Robert Barrat
Sgt. Makepeace
Rex Lease
Dandy at Party (uncredited)
Kirk Alyn
Second Sergeant (uncredited)
Harry Brown
Museum Guard (uncredited)
George M. Carleton
Bill - Museum Guard (uncredited)
Wheaton Chambers
Party Guest (uncredited)
James Conaty
John Crawford
Leigh - Traitor (uncredited)
Vernon Downing
Melody Allen
Marjorie Reynolds
Bessie - Danbury's Maid (uncredited)
Marjorie Eaton
Myron Healey
Cranwell - Traitor (uncredited)
Boyd Irwin
Mr. Dibbs - Museum Curator (uncredited)
Selmer Jackson
Danbury Servant (uncredited)
William H. O'Brien
Scott Thomson
Motorcycle Rider (uncredited)
Harry Woolman
Mildred Dean
Binnie Barnes
Sheldon Gage
John Shelton
Emily
Gale Sondergaard
June Prescott
Lynn Baggett
Thomas Danbury
Jess Barker
Nora O'Leary
Ann Gillis
Lt. Mason
Donald MacBride
Director
Charles Barton
Screenplay
Walter DeLeon
Val Burton
Additional Dialogue
John Grant
Bradford Ropes
Producer
Editor
Philip Cahn
Art Direction
Jack Otterson
Set Decoration
Russell A. Gausman
Original Music Composer
Milton Rosen
Assistant Director
Seward Webb
Executive Producer
Joseph Gershenson
Costume Design
Rosemary Odell
Director of Photography
Charles Van Enger
Richard H. Riedel
Ruby R. Levitt