Gamera is Godzilla's dumb cousin -metaphorically speaking, that is, they aren't really related. Gamera suffers by having to be a man on his knees in a giant turtle suit. This means he isn't very agile, his arms are short. and he can't throw very well. When Gamera hurls a boulder at an opponent, he more or less lifts it up and lets it go and by some miracle it shoots straight at the enemy monster. He does have a fiery breath but it's nowhere near as effective as Godzilla's radioactive blasts.
Fortunately, the enemies from outer space who want to destroy the world with their giant monsters are so dumb that a ten year old boy can usually outwit them as happens in both these films. This is because Gamera is a friend to children and he can apparently hear them calling his name from miles away. Plus they were made for the kiddie audience which doesn't explain why I'm watching them.
Once they arrive, they send down their agent who looks just like a young Japanese woman as do the three space women. The bad girl, however, gets blamed every time one of their monsters fails to defeat Gamera which is hardly her fault. Okay, maybe she can't outwit a 10 year old boy and fails dismally to kill the space women. The space women's leader is tall with very short hair, wears trousers and reminds me of a lesbian dominatrix -but that could just be me and my interest did perk up whenever she was onscreen.
Okay, these two films are very silly, not terribly well made, and great to laugh at. Alternatively you can sit down with a youngish child and enjoy them together. You may, however, want to put your hands over your ears when they play Gamera's theme song.