An unconvincing model moon base is blasted by a spaceship (which looks like the crown of The Statue of Liberty has collided with a giant liquorice allsort); the spaceship proceeds to Earth and lands in the sea. On board the craft: a hot Japanese woman (Eiko Yanami) under the control of Zigra, an alien goblin shark/swordfish who causes massive earthquakes (that occur off-screen to stay within budget) in order to force the human race to surrender its oceans. Gamera isn't about to let that happen and steps in to sort out the uppity fish, but when the titanic turtle destroys the spaceship, Zigra grows to massive proportions...
If it wasn't for the presence of yummy Eiko Yanami, who cavorts in a sexy space outfit, a bikini, and a mini-skirt, I would have dozed off during this one: it's easily the worst of the Gamera films thus far, with a hum-drum seen-it-all-before plot, annoying kids, and very little in the way of monster action. Much of the film acts as an advertisement for Kamogawa Sea World, and we're treated to performing killer whales and seals. Meanwhile, Gamera spends a lot of the time face down in the sea, having been zapped by Zigra, and is only revived by a lightning bolt for the finalé, in which he teaches Zigra a lesson by playing his dorsal spines like a xylophone before barbecuing him.
2.5/10, generously rounded up to 3 for the salient environmental message: keep the oceans clean!
