Hey Bill, interesting post. For many years I had always thought that RD did the voiceover for the Night of DS movie trailers. Then one day I happened to be listening through headphones and doubt struck me. I checked in here with THE authority on the two 1970s DS feature films, the Honorable Mr. Darren Gross, and he confirmed that in fact it WASN'T Davis doing the v/o in that.
On the other hand, Grayson Hall mentioned in a circa 1980 interview having recently done the v/o for a commercial advertising a compilation of "The Greatest Hits of Blue Oyster Cult." To hear THAT, I'd crawl over broken glass in a darkened alleyway. lol. Just another obsessed fan--and, as is well known, bitchy queen.
G.