I thought that was Rod Serling at the beginning of this trailer. It's such a great movie, and I've written about it in here before. It aired a lot in my area, and it took more than one viewing to figure the movie out. Count me as one of the fans of the xenomorphs. I would have been very disappointed if I had not see it.
I would have enjoyed seeing this movie in 3 Dimesion, as Richard Carlson tells us in the trailer. The trailer does it's job well, and still gives nothing away, which for a 50s sci-fi trailer is pretty rare.