Gamera 3: Jashin kakusei

This movie, being the last of the Gamera saga, is the best of the bunch. Not only are the effects top-notch, (particularly the scenes in which Gamera and Gaos birds are fighting over the city with no particular regard to human life), but the story of loss and vengeance with a young girl tied to one the first movies in the series brings a more darker theme to the genre. It's not necessarily required to watch all of the movies to catch up, but it couldn't hurt. The newer design for Gamera is the best design for him yet. He should have always been this way, however, since his appearance has changed in all three movies, they never explain how or why that is. I gather that they expect us to believe that he has always looked that way, especially since a flashback scene from the first Gamera movie features his new design instead of the one he had for the movie. The ending is a very clever touch to have fans gasping for more. If you're a giant kaiju fan this movie i would highly recommend.