This movie is the third and last film of the Mothra trilogy. It concerns King Ghidorah invading earth and stealing children. Mothra comes to fight King Ghidorah and three battles ensue: one in the forest, one in the Cretaceous period, and one in the forest again. In the end, Mothra and the power of good prevail against King Ghidorah and the power of evil.
Now there are quite a few improvements and good points about this film. King Ghidorah is an awesome monster, much more impressive than the 1991 version, Death Ghidorah, and Dagahra. Mothra is impressive too. The city destructions scenes are quite exciting and fun to watch. The monster battle scenes were able to recapture much of the intensity that the Godzilla movies had but the first two Mothras lacked. Though the film is still directed at children, the main character is a bit older and not as annoying as the kids from the previous entries were.
Now, there are some aspects that really detracted from the film. The city destruction scenes, while exciting, are way too short. The previous two Mothra films had monster fights that nearly took up the entire middle portion of the film whereas this movie had one short one, one medium-sized one, and (following in tradition of the other two) a short final battle. The musical talents of Akira Ifukube are lacking as well. I also thought that the Prehistoric Mothra scene was quite contrived.
Overall, it's a fun movie to watch but still doesn't live up to the level of Godzilla. However, it's still good to see King Ghidorah looking as magnificent as ever.
