There have been a number of Shadow movies over time, and they are highly variable in quality. Sometimes it's the traditional Shadow; sometimes it's a person that's more an amateur detective than anything else. Sometimes the figure has the Shadow's cloak and appearance; sometimes the figure never even uses any disguise. I'll post movie reviews as I get to see the movies.
The Shadow Strikes (1937)
International Crime (1938)
Behind the Mask (1946)
The Missing Lady (1946)
The Shadow Returns (1946)
The Case of the Cotton Kimona (1951)
Invisible Avenger (1958)
The Shadow