This would have been a better movie to make than what's now known as Attack of the Phantoms. Especially if Tsuburaya Productions had done the effects. And wrote the script. The songs could stay the same. I love that movie, but it's not great. I prefer the shorter version, even. Make fans wait a half an hour after the movie starts to see the stars... what kind of dang deal is that? No one would be foolish enough to do that these days, right?
Anyway, this would have been taken around 1978 or so, since those are the Love Gun costumes. I think that's when The Last Dinosaur was made. Man, I'm a lousy fan. The picture on the right is from Aizenborg, in which the ol' Rex was the chief villain for a time.
It seems to me visiting Tsuburaya Studios would have been Gene's idea, or suggested to him, what with him being a monster fan and all. Someone that can read Japanese can tell me what's going on, other than it being a publicity shot.