Hey, did you see the new episode of American Masters on PBS? The one about Mel Brooks? Well, if you didn't, here it is…
About halfway through, you'll see an ad for Young Frankenstein which sounds like it was narrated by Mel — and it may have been. But I'm not sure that's not Walker Edmiston. Walker, who alas is no longer with us, was a great voice actor who often came in and dubbed other performers. He did a lot of lines for Orson Welles in Start the Revolution Without Me, for instance. He did an uncanny Mel Brooks imitation. It was so good that in a recording session once with Mel's old compatriot, Howard Morris, I had Walker do it over the talkback and Howie thought it was Mel. Anyway, Walker did a series of radio promos for Young Frankenstein that had to be produced while Mel was out of the country. Everyone thought it was Mel but it was Walker…and I'm not sure that promo isn't Walker.
And speaking of Howie Morris: When you get to the scene from Get Smart with the Cone of Silence, that's Howie's voice on the intercom. He directed that episode, which was the pilot for the series.