A movie secretly directed by Mel under another name?
Some years back on the Universal Studios Hollywood Backlot Tour, I remember they used to mention that Mel Brooks had directed a movie earlier on in his career under a pseudonym of sorts, I believe it was some kind of horror movie, possibly black and white (not "Young Frankenstein"), and for some reason he didn't want his normal stage name credited on the picture, so he used an alias.
But I've not heard them mention this bit of info for some time, and have forgotten the specific details on the matter.
Does anyone have any idea what they were talking about?