Basil Rathbone (Sherlock Holmes)
Cass Daley (Sadie)
Patric Knowles (Mac)
Martha O'Driscoll (Margie)
Leighton Noble (Johnny)
Thomas Gomez (Wagstaff)
Tony De Marco
Paula Kelly (Vocalist, one of the Modernaires)
Ole Olsen (Himself)
Fiorello LaGuardia
Chic Johnson (Himself)
Nigel Bruce (Orchestra)
Lon Chaney, Jr.
Billy Gilbert (Stone)
Chester Clute (Fud)
Edgar Kennedy (Judge)
Franklin Pangborn (Hotel Clerk)
Shemp Howard (Munbo)
Sally de Marco
Count Basie and His Orchestra
Marion Hutton (Herself)
The Delta Rhythm Boys
Allan Jones (Orchestra)
Leo Carrillo
Andy Devine
Robert Paige (Orchestra)
Alan Curtis (Orchestra)
Percy Kilbride (Col. Merriweather)
Hans Conried (Roco)
Richard Lane (Hanley)
Andrew Tombes (Gregory)