Ole Olsen
— Himself
Chic Johnson
— Himself
Cass Daley
— Herself / Sadie Silverfish
Martha O'Driscoll
— Marjorie Nelson / Marjorie Wyndingham
Patric Knowles
— Edmund 'Mac' MacLean
Percy Kilbride
— Col. Cornelius Merriweather
Hans Conried
— Roco
Shemp Howard
— Mumbo
Basil Rathbone
— Sherlock Holmes
Nigel Bruce
— Dr. Watson
Ramsay Ames
— Herself - Dancer
Louise Allbritton
— Cameo Appearance
Evelyn Ankers
— Cameo Appearance
Jimmy Aubrey
— Cameo Appearance
Turhan Bey
— Cameo Appearance
Lon Chaney Jr.
— Cameo Appearance
Gale Sondergaard
— Cameo Appearance
Leighton Noble
— Johnny
Thomas Gomez
— N.G. Wagstaff
Richard Lane
— S. E. Hanley
Andrew Tombes
— Horace L. Gregory
Billy Gilbert
— Sid Drake
Chester Clute
— Fud
Edgar Kennedy
— Judge
Franklin Pangborn
— Hotel Clerk
Fred Sanborn
— Jumbo
Sally De Marco
— Sally De Marco
Tony De Marco
— Tony De Marco
Marion Hutton
— Marion Hutton
Delta Rhythm Boys
— The Delta Rhythm Boys