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Ole Olsen
Himself
Chic Johnson
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
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Released
Universal Pictures
Robert Lees
Screenplay
Arthur Hilton
Editor
Frederic I. Rinaldo
Edward F. Cline
Director
