In this outing Gamera fights a giant bat-like creature called Gyaos. The monster proves to be pretty indestructible and shoots laser beams out of it's mouth.
A child develops an emotional link to Gamera and they both help him defeat the monster. The kid isn't prominent as they made children in the later films, but it still gets a little annoying. The battle scenes are pretty well staged and it soon become apparent that Gyaos cannot stand the sunlight.
Gamera bleeds a lot in the film, but it's green blood, but that does not mean he comes from Blood Island. If you like giant monster bashes, this film is for you. The series would get even more juvenile in the next film.