Thanks for the background for "X, the Unknown". It's interesting to discover how personal philosophies can reshape a production, sometimes for the better, many times for the worse. Amusing observation about the Major. I too thought about the Brigadier, even before he made that particular comment. In fact, I mentally replaced Dean Jagger with Jon Pertwee and the thing played out like a prototypical Barry Letts era UNIT story. About the only thing missing was the Jo Grant role. Well, the plant director's son could have been Liz Shaw in a few scenes where exposition was presented.