House Of Frankenstein

House Of Frankenstein is a 1944 monster movie starring Boris Karloff, Lon Chaney, Jr., John Carradine, Lionel Atwill, George Zucco, Sig Ruman. Glenn Strange is the monster.

trailer:

1000 Misspent Hours says,

in the mad rush to squeeze in the maximum possible number of monsters, the folks in charge of the project forgot to include one thing— anything even remotely resembling a coherent, unified story.

Moria doesn't like it and has a how-the-mighty-have-fallen take on the film.