A rather confusing film. Although this is a Toho movie and involves a monster destroying perfectly made minature buildings, the main focus of the film is a crime story involving diamonds. Though the monster, a giant jelly fish from space, likes eating diamonds (and coal) so the stories are linked!
The crimes (and monster) is being investigated by Inspector Kommei (Yosuke Natsuki) and gaijin Mark Jackson (Robert Dunham), as well as bearded scientist Dr Munakata (Nobuo Nakamura).
The problem with the film is that is it neither one thing or the other. Most of the film is taken up with the diamond case, which is rather confusing though the actual crimes are well done. The monster seems a bit tacked on and doesn't take up much of the film, those does provide for the opportunity for some special effects... and destruction. Not a great film but it looks good.