When it comes to giant monsters/kaiju in cinema history, there is no doubt that Godzilla tends to be the first one to come to mind. However, there is one monster that few people outside of Japan know about: Gamera. This kaiju has been around for just as long as Godzilla and the two have been box-office rivals for over half a century. Though Gamera hasnt been released internationally like his rival, his movies have been largely successful in Japan.