[neverending]

Son of Frankenstein is a MUST. It completes the Frankenstein trilogy, and contains a lot of the imagery that we remember.

The Old Dark House is also a must. All star cast and a tremendously wicked script combine to make a movie well worth watching.

The Ghoul and The Invisible Ray both have great performances from the King of Horror.

I'd also like to argue AGAINST Revolt of the Zombies. It's a really crappy low budget piece of junk.